LTC5598

5MHz to 1600MHz
High Linearity Direct
Quadrature Modulator
FEATURES DESCRIPTION
n Frequency Range: 5MHz to 1600MHz The LTC®5598 is a direct I/Q modulator designed for high
n High Output IP3: +27.7dBm at 140MHz performance wireless applications, including wireless
+22.9dBm at 900MHz infrastructure. It allows direct modulation of an RF signal
n Low Output Noise Floor at 6MHz Offset: using differential baseband I and Q signals. It supports
No Baseband AC Input: –161.2dBm/Hz point-to-point microwave link, GSM, EDGE, CDMA,
POUT = 5.5dBm: –160dBm/Hz 700MHz band LTE, CDMA2000, CATV applications and
n Low LO Feedthrough: –55dBm at 140MHz other systems. It may also be configured as an image
n High Image Rejection: –50.4dBc at 140MHz reject upconverting mixer, by applying 90° phase-shifted
n Integrated LO Buffer and LO Quadrature Phase signals to the I and Q inputs.
Generator
n
The I/Q baseband inputs consist of voltage-to-current
50Ω Single-Ended LO and RF Ports
n
converters that in turn drive double-balanced mixers.
>400MHz Baseband Bandwidth
The outputs of these mixers are summed and applied
n 24-Lead QFN 4mm × 4mm Package
n
to a buffer, which converts the differential mixer signals
Pin-Compatible with Industry Standard Pin-Out
n
to a 50Ω single-ended buffered RF output. The four
Shut-down Mode
balanced I and Q baseband input ports are intended for
APPLICATIONS DC coupling from a source with a common-mode voltage
level of about 0.5V. The LO path consists of an LO buffer
n Point-to-Point Microwave Link with single-ended or differential inputs, and precision
n Military Radio quadrature generators that produce the LO drive for the
n Basestation Transmitter GSM/EDGE/CDMA2K mixers. The supply voltage range is 4.5V to 5.25V, with
n 700MHz LTE Basestation Transmitter about 168mA current.
n Satellite Communication L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
n CATV/Cable Broadband Modulator All other trademarks are the property of their respective owners.

n 13.56MHz/UHF RFID Modulator

TYPICAL APPLICATION
Noise Floor vs RF Output Power
5MHz to 1600MHz Direct Conversion Transmitter Application and Differential LO Input Power
5V
1nF 4.7μF –152
VCC fLO = 140MHz; fBB = 2kHz; CW (NOTE 3)
NOISE FLOOR AT 6MHz OFFSET (dBm/Hz)

x2 x2
LTC5598 20dBm
I-DAC V-I RF = 5MHz –154 19.3dBm
TO 1600MHz 13.4dBm
I-CHANNEL 10.4dBm
–156 8.4dBm
0o 6.4dBm
EN PA
90o
10nF
Q-CHANNEL –158

Q-DAC V-I
–160
BASEBAND 5598 TA01

GENERATOR 10nF
–162
50Ω 10nF 470nF –14 –12 –10 –8 –6 –4 –2 0 2 4 6 8
VCO/SYNTHESIZER RF OUTPUT POWER (dBm)
5598 TA02

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LTC5598
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
TOP VIEW
Supply Voltage .........................................................5.6V
Common Mode Level of BBPI, BBMI and

BBMI
BBPI
VCC1
GND

GND
GND
BBPQ, BBMQ ...........................................................0.6V 24 23 22 21 20 19
LOP, LOM Input ....................................................20dBm EN 1 18 VCC2
Voltage on Any Pin GND 2 17 GNDRF
Not to Exceed ...................................–0.3V to VCC + 0.3V LOP 3 16 RF
25
TJMAX .................................................................... 150°C LOM 4 15 NC
Operating Temperature Range..................– 40°C to 85°C GND 5 14 GNDRF

Storage Temperature Range...................–65°C to 150°C CAPA 6 13 NC

7 8 9 10 11 12

CAPB
GND
BBMQ
BBPQ
GND
GND
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 150°C, θJA = 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC5598IUF#PBF LTC5598IUF#TRPBF 5598 24-Lead (4mm × 4mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

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 LTC5598
ELECTRICAL CHARACTERISTICS VCC = 5V, EN = 5V, TA = 25ºC, PLO = 0dBm, single-ended; BBPI, BBMI,
BBPQ, BBMQ common-mode DC voltage VCMBB = 0.5VDC, I&Q baseband input signal = 100kHz CW, 0.8VPP,DIFF each, I&Q 90° shifted
(lower side-band selection), unless otherwise noted. (Note 11)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RF OUTPUT (RF)
fRF RF Frequency Range 5 to 1600 MHz
S22, ON RF Output Return Loss EN = High, 5MHz to 1600MHz <–20 dB
fLO = 140MHz, fRF = 139.9MHz
GV Conversion Voltage Gain 20 • Log (VRF, OUT, 50Ω/VIN, DIFF, I or Q) –2 dB
POUT Absolute Output Power 1VPP,DIFF on each I&Q Inputs 2 dBm
OP1dB Output 1dB Compression 8.5 dBm
OIP2 Output 2nd Order Intercept (Notes 4, 5) 74 dBm
OIP3 Output 3rd Order Intercept (Notes 4, 6) 27.7 dBm
NFloor RF Output Noise Floor No Baseband AC Input Signal (Note 3) –161.2 dBm/Hz
POUT = 4.6dBm (Note 3) PLO, SE = 10dBm –154.5 dBm/Hz
POUT = 5.5dBm (Note 3) PLO, DIFF = 20dBm –160 dBm/Hz
IR Image Rejection (Note 7) –50.4 dBc
LOFT LO Feedthrough EN = High (Note 7) –55 dBm
(Carrier Leakage) EN = Low (Note 7) –78 dBm
fLO = 450MHz, fRF = 449.9MHz
GV Conversion Voltage Gain 20 • Log (VRF, OUT, 50Ω/VIN, DIFF, I or Q) –5.0 –2.1 0.5 dB
POUT Absolute Output Power 1VPP,DIFF on each I&Q Inputs 1.9 dBm
OP1dB Output 1dB Compression 8.4 dBm
OIP2 Output 2nd Order Intercept (Notes 4, 5) 72 dBm
OIP3 Output 3rd Order Intercept (Notes 4, 6) 25.5 dBm
NFloor RF Output Noise Floor No Baseband AC Input Signal (Note 3) –160.9 dBm/Hz
IR Image Rejection (Note 7) –55 dBc
LOFT LO Feedthrough EN = High (Note 7) –51 dBm
(Carrier Leakage) EN = Low (Note 7) –68 dBm
fLO = 900MHz, fRF = 899.9MHz
GV Conversion Voltage Gain 20 • Log (VRF, OUT, 50Ω/VIN, DIFF, I or Q) –2 dB
POUT Absolute Output Power 1VPP,DIFF on each I&Q Inputs 2 dBm
OP1dB Output 1dB Compression 8.5 dBm
OIP2 Output 2nd Order Intercept (Notes 4, 5) 69 dBm
OIP3 Output 3rd Order Intercept (Notes 4, 6) 22.9 dBm
NFloor RF Output Noise Floor No Baseband AC Input Signal (Note 3) –160.3 dBm/Hz
POUT = 5.2dBm (Note 3) PLO, SE = 10dBm –154.5 dBm/Hz
IR Image Rejection (Note 7) –54 dBc
LOFT LO Feedthrough EN = High (Note 7) –48 dBm
(Carrier Leakage) EN = Low (Note 7) –54 dBm

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LTC5598
ELECTRICAL CHARACTERISTICS VCC = 5V, EN = 5V, TA = 25ºC, PLO = 0dBm, single-ended; BBPI, BBMI,
BBPQ, BBMQ common-mode DC voltage VCMBB = 0.5VDC, I&Q baseband input signal = 100kHz CW, 0.8VPP,DIFF each, I&Q 90° shifted
(lower side-band selection), unless otherwise noted. (Note 11)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LO INPUT (LOP)
fLO LO Frequency Range 5 to 1600 MHz
PLO,DIFF Differential LO Input Power Range –10 to 20 dBm
PLO, SE Single-Ended LO Input Power Range –10 to 12 dBm
S11, ON LO Input Return Loss EN = High –10.5 dB
S11, OFF LO Input Return Loss EN = Low –9.6 dB
BASEBAND INPUTS (BBPI, BBMI, BBPQ, BBMQ)
BWBB Baseband Bandwidth -3dB Bandwidth >400 MHz
Ib,BB Baseband Input Current Single-Ended –68 μA
RIN, SE Input Resistance Single-Ended –7.4 kΩ
VCMBB DC Common-Mode Voltage Externally Applied 0.5 V
VSWING Amplitude Swing No Hard Clipping, Single-Ended 0.86 VP-P
POWER SUPPLY (VCC1, VCC2)
VCC Supply Voltage 4.5 5 5.25 V
ICC(ON) Supply Current EN = High, ICC1+ ICC2 130 165 200 mA
ICC(OFF) Supply Current, Sleep Mode EN = 0V, ICC1+ ICC2 0.24 0.9 mA
tON Turn-On Time EN = Low to High (Notes 8, 10) 75 ns
tOFF Turn-Off Time EN = High to Low (Notes 9, 10) 10 ns
POWER UP/DOWN
Enable Input High Voltage EN = High 2 V
Input High Current EN = 5V 43 μA
Sleep Input Low Voltage EN = Low 1 V
Input Low Current EN = 0V –40 μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 6: IM3 is measured at LO frequency – 1.9 MHz and LO frequency
may cause permanent damage to the device. Exposure to any Absolute – 2.2MHz.
Maximum Rating condition for extended periods may affect device Note 7: Amplitude average of the characterization data set without image
reliability and lifetime. or LO feedthrough nulling (unadjusted).
Note 2: The LTC5598 is guaranteed functional over the operating Note 8: RF power is within 10% of final value.
temperature range –40ºC to 85ºC. Note 9: RF power is at least 30dB lower than in the ON state.
Note 3: At 6MHz offset from the LO signal frequency. 100nF between BBPI Note 10: External coupling capacitors at pins LOP, LOM and RF are 100pF
and BBMI, 100nF between BBPQ and BBMQ. each.
Note 4: Baseband is driven by 2MHz and 2.1MHz tones with 1VPP,DIFF for Note 11: Tests are performed as shown in the configuration of Figure 10.
two-tone signals at each I or Q input (0.5VPP,DIFF for each tone). The LO power is applied to J3 while J5 is terminated with 50Ω to ground
Note 5: IM2 is measured at LO frequency – 4.1MHz. for single-ended LO drive.

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 LTC5598
TYPICAL PERFORMANCE CHARACTERISTICS VCC = 5V, EN = 5V, TA = 25ºC, fRF = fLO – fBB, PLO =
0dBm single-ended, BBPI, BBMI, BBPQ, BBMQ common-mode DC voltage VCMBB = 0.5VDC , I&Q baseband input signal = 100kHz,
0.8VPP,DIFF, two-tone baseband input signal = 2MHz, 2.1MHz, 0.5VPP,DIFF each tone, I&Q 90° shifted (lower side-band selection);
fNOISE = fLO – 6MHz; unless otherwise noted. (Note 11)

Supply Current vs Temperature Voltage Gain vs RF Frequency Output IP3 vs RF Frequency

180 –1 29

5.25V 27
170 –2
SUPPLY CURRENT (mA)

VOLTAGE GAIN (dB)

25
5.0V

OIP3 (dBm)
160 –3 23

21
5V, 25°C 5V, 25°C
150 4.5V –4 5.25V, 25°C 5.25V, 25°C
4.5V, 25°C 19 4.5V, 25°C
5V, –40°C 5V, –40°C
5V, 85°C 5V, 85°C
140 –5 17
–40 –15 10 35 60 85 10 100 1000 10 100 1000
TEMPERATURE (°C) RF FREQUENCY (MHz) RF FREQUENCY (MHz)
5598 G02 5598 G03
5598 G01

Output 1dB Compression LO Feedthrough to RF Output

Output IP2 vs RF Frequency vs RF Frequency vs LO Frequency
85 10 –40

80
8

LO FEEDTHROUGH (dBm) –50

75
OP1dB (dBm)
OIP2 (dBm)

6
70
4
65 –60
5V, 25°C 5V, 25°C 5V, 25°C
5.25V, 25°C 5.25V, 25°C 5.25V, 25°C
4.5V, 25°C 2
60 4.5V, 25°C 4.5V, 25°C
5V, –40°C 5V, –40°C 5V, –40°C
5V, 85°C 5V, 85°C 5V, 85°C
55 0 –70
10 100 1000 10 100 1000 10 100 1000
RF FREQUENCY (MHz) RF FREQUENCY (MHz) LO FREQUENCY (MHz)
5598 G04 5598 G05 5598 G06

Noise Floor vs RF Frequency RF Two-Tone Power (Each Tone),

Image Rejection vs LO Frequency (No AC Baseband Input Signal) IM2 and IM3 vs RF Frequency
–20 –145 0 –40
5V, 25°C 5V, 25°C
5.25V, 25°C 5.25V, 25°C fRF, EACH = fLO – fBB1
4.5V, 25°C 4.5V, 25°C –10 –50
–30
5V, –40°C –150 5V, –40°C
IMAGE REJECTION (dBc)

fIM3 = fLO + 2*fBB1 + fBB2

NOISE FLOOR (dBm/Hz)

IM2 (dBm), IM3 (dBm)

5V, 85°C 5V, 85°C

(NOTE 3) –20 –60
PRF,TONE (dBm)

–40 fIM3 = fLO – 2*fBB1 + fBB2

–155 –30 –70
–50
–40 –80
–160
–60
–50 fIM2 = fLO – fBB1 – fBB2 –90

–70 –165 –60 –100

10 100 1000 10 100 1000 10 100 1000
LO FREQUENCY (MHz) RF FREQUENCY (MHz) RF FREQUENCY (MHz)
5598 G07 5598 G08 5598 G09

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LTC5598
TYPICAL PERFORMANCE CHARACTERISTICS VCC = 5V, EN = 5V, TA = 25ºC, fRF = fLO – fBB, PLO =
0dBm single-ended, BBPI, BBMI, BBPQ, BBMQ common-mode DC voltage VCMBB = 0.5VDC , I&Q baseband input signal = 100kHz,
0.8VPP,DIFF, two-tone baseband input signal = 2MHz, 2.1MHz, 0.5VPP,DIFF each tone, I&Q 90° shifted (lower side-band selection);
fNOISE = fLO – 6MHz; unless otherwise noted. (Note 11)

RF Two-Tone Power (Each Tone), RF Two-Tone Power (Each Tone),

IM2 and IM3 vs Baseband Voltage IM2 and IM3 vs Baseband Voltage Voltage Gain vs RF Frequency
and Temperature (fLO = 140MHz) and Temperature (fLO = 900MHz) (PLO = 10dBm)
10 –30 10 –30 –1
PLO = 10dBm

0 –40 0 fRF, EACH = fLO – fBB1 –40

IM2 (dBm), IM3 (dBm) –2

IM2 (dBm), IM3 (dBm)

VOLTAGE GAIN (dB)

–10 –50 –10 –50
PRF, TONE (dBm)

fRF, EACH = fLO –fBB1 PRF,TONE (dBm)

fIM3 = fLO + 2*fBB1 + fBB2
fIM3 = fLO – 2*fBB1 + fBB2
–20 fIM3 = fLO + 2*fBB1 + fBB2 –60 –20 –60 –3
fIM2 = fLO – fBB1 – fBB2
–30 –70 –30 f –70
IM3 = fLO – 2*fBB1 + fBB2 5V, 25°C
–4 5.25V, 25°C
–40 –80 –40 fIM2 = fLO – fBB1 – fBB2 –80 4.5V, 25°C
5V, –40°C
5V, 85°C
–50 –90 –50 –90 –5
0.1 1 0.1 1 10 100 1000
I AND Q BASEBAND VOLTAGE (VPP, DIFF, EACH TONE) I AND Q BASEBAND VOLTAGE (VPP, DIFF, EACH TONE) RF FREQUENCY (MHz)
5598 G10 5598 G11 5598 G12

Output IP3 vs RF Frequency Output IP2 vs RF Frequency Output 1dB Compression

(PLO = 10dBm) (PLO = 10dBm) vs RF Frequency (PLO = 10dBm)
29 85 10

27 80
8

25 75
OP1dB (dBm)
OIP3 (dBm)

OIP2 (dBm)

6
23 70
4
21 65
5V, 25°C 5V, 25°C 5V, 25°C
5.25V, 25°C 5.25V, 25°C 5.25V, 25°C
4.5V, 25°C 2 4.5V, 25°C
19 60 4.5V, 25°C
5V, –40°C 5V, –40°C 5V, –40°C
5V, 85°C 5V, 85°C 5V, 85°C
17 55 0
10 100 1000 10 100 1000 10 100 1000
RF FREQUENCY (MHz) RF FREQUENCY (MHz) RF FREQUENCY (MHz)
5598 G13 5598 G14 5598 G15

RF Two-Tone Power (Each Tone),

LO Feedthrough to RF Output Image Rejection vs LO Frequency IM2 and IM3 vs RF Frequency
vs LO Frequency (PLO = 10dBm) (PLO = 10dBm) (PLO = 10dBm)
–40 –20 0 –40
5V, 25°C
5.25V, 25°C fRF, EACH = fLO – fBB1
4.5V, 25°C
–30
5V, –40°C
LO FEEDTHROUGH (dBm)

IMAGE REJECTION (dBc)

fIM3 = fLO + 2*fBB1 + fBB2

IM2 (dBm), IM3 (dBm)

5V, 85°C
–50
PRF, TONE (dBm)

–40 fIM3 = fLO – 2*fBB1 + fBB2

–50
–60
5V, 25°C
5.25V, 25°C
–60 fIM2 = fLO – fBB1 – fBB2
4.5V, 25°C
5V, –40°C
5V, 85°C
–70 –70 –60 –100
10 100 1000 10 100 1000 10 100 1000
LO FREQUENCY (MHz) LO FREQUENCY (MHz) RF FREQUENCY (MHz)
5598 G16 5598 G17 5598 G18

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 LTC5598
TYPICAL PERFORMANCE CHARACTERISTICS VCC = 5V, EN = 5V, TA = 25ºC, fRF = fLO – fBB, fLO =
450MHz, PLO = 0dBm single-ended, BBPI, BBMI, BBPQ, BBMQ common-mode DC voltage VCMBB = 0.5VDC , I&Q baseband input signal
= 100kHz, 0.8VPP,DIFF, two-tone baseband input signal = 2MHz, 2.1MHz, 0.5VPP,DIFF each tone, I&Q 90° shifted (lower side-band
selection); fNOISE = fLO – 6MHz; unless otherwise noted. (Note 11)

Noise Floor vs RF Frequency

(PLO = 10dBm, No AC Baseband LO Feedthrough to RF Output Image Rejection vs LO Frequency
Input Signal) vs LO Frequency for EN = Low (PLO = 10dBm)
–145 0
5V, 25°C
5.25V, 25°C –40
–10
4.5V, 25°C –40°C C8 = 0
5V, –40°C

LO FEEDTHROUGH (dBm)
–150 –20

IMAGE REJECTION (dBc)

NOISE FLOOR (dBm/Hz)

5V, 85°C –60

(NOTE 3) –30
–80 PLO = 10dBm
–155 –40

–100 –50
PLO = 0dBm 85°C
C8 = 470nF
–160 –60
–120
–70

–165 –140 –80

10 100 1000 10 100 1000 10 100 1000
RF FREQUENCY (MHz) LO FREQUENCY (MHz) LO FREQUENCY (MHz)
5598 G19 5598 G20 5598 G20a

Noise Floor vs RF Output Power and

Differential LO Input Power Gain Distribution Output IP3 Distribution at 25°C
–152 60 30
fLO = 140MHz; fBB = 2kHz; CW (NOTE 3) 85oC
NOISE FLOOR AT 6MHz OFFSET (dBm/Hz)

25oC
50 –40oC 25
–154 20dBm
19.3dBm
PERCENTAGE (%)

PERCENTAGE (%)
13.4dBm 40 20
–156 10.4dBm
8.4dBm
6.4dBm 30 15
–158
20 10

–160
10 5

–162 0 0
–14 –12 –10 –8 –6 –4 –2 0 2 4 6 8 –2.4 –2.3 –2.2 –2.1 –2 –1.9 24 24.4 24.8 25.2 25.6 26 26.4 26.8 27.2
RF OUTPUT POWER (dBm) GAIN (dB) OIP3 (dBm)
5598 G20b 5598 G21 5598 G22

LO Feedthrough Distribution Image Rejection Distribution Noise Floor Distribution

25 40 70
85oC 85oC 85oC
25oC 35 25oC 25oC
–40oC –40oC 60 –40oC
20 NO RF
30
50
PERCENTAGE (%)
PERCENTAGE (%)

PERCENTAGE (%)

15 25
40
20
30
10 15
20
10
5
5 10

0 0 0
–70 –66 –62 –58 –54 –50 –46 –42 –38 –70 –66 –62 –58 –54 –50 –46 –42 –162.4 –162 –161.6 –161.2 –160.8 –160.4 –160
LO FEEDTHROUGH (dBm) IMAGE REJECTION (dBc) NOISE FLOOR (dBm/Hz)
5598 G23 5598 G24 5598 G25

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LTC5598
PIN FUNCTIONS
EN (Pin 1): Enable Input. When the Enable Pin voltage is NC (Pins 13, 15): No Connect. These pins are floating.
higher than 2 V, the IC is turned on. When the input voltage GNDRF (Pins 14, 17): Ground. Pins 14 and 17 are connected
is less than 1 V, the IC is turned off. If not connected, the to each other internally and function as the ground return for
IC is enabled. the RF output buffer. They are connected via back-to-back
GND (Pins 2, 5, 8, 11, 12, 19, 20, 23 and 25): Ground. diodes to the exposed pad 25. For best LO suppression
Pins 2, 5, 8, 11, 12, 19, 20, 23 and exposed pad 25 are performance those pins should be grounded separately
connected to each other internally. For best RF performance, from the exposed paddle 25. For best RF performance,
pins 2, 5, 8, 11, 12, 19, 20, 23 and the Exposed Pad 25 pins 14 and 17 should be connected to RF ground.
should be connected to RF ground. RF (Pin 16): RF Output. The RF output is a DC-coupled
LOP (Pin 3): Positive LO Input. This LO input is internally single-ended output with approximately 50Ω output
biased at about 2.3V. An AC de-coupling capacitor should impedance at RF frequencies. An AC coupling capacitor
be used at this pin to match to an external 50Ω source. should be used at this pin to connect to an external
load.
LOM (Pin 4): Negative LO Input. This input is internally biased
at about 2.3V. An AC de-coupling capacitor should be used at VCC (Pins 18, 24): Power Supply. It is recommended to
this pin via a 50Ω to ground for best OIP2 performance. use 1nF and 4.7μF capacitors for decoupling to ground
on each of these pins.
CAPA, CAPB (Pins 6, 7): External capacitor pins. A cap-
acitor between the CAPA and the CAPB pin can be used in BBPI, BBMI (Pins 21, 22): Baseband Inputs for the Q-
order to improve the image rejection for frequencies below channel, each high input impedance. They should be
100MHz. A capacitor value of 470nF is recommended. externally biased at 0.5V common-mode level and not be
These pins are internally biased at about 2.3V. left floating. Applied common-mode voltage must stay
below 0.6VDC.
BBMQ, BBPQ (Pins 9, 10): Baseband Inputs for the
Q-channel, each high input impedance. They should be Exposed Pad (Pin 25): Ground. This pin must be soldered
externally biased at 0.5V common-mode level and not be to the printed circuit board ground plane.
left floating. Applied common-mode voltage must stay
below 0.6VDC.

BLOCK DIAGRAM
GND VCC1 VCC2 NC
20 23 25 24 18 13 15
LTC5598

BBPI 21
V-I
BBMI 22

0o
16 RF
EN 1
90o

BBPQ 10 14
V-I GNDRF
BBMQ 9
17

2 5 8 11 3 4 6 7 12 19
5598 BD
GND LOP LOM CAPA CAPB GND

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 LTC5598
APPLICATIONS INFORMATION
The LTC5598 consists of I and Q input differential voltage- inserted in each of the four baseband connections, the
to-current converters, I and Q up-conversion mixers, an –1dB baseband bandwidth increases to about 800MHz.
RF output buffer, an LO quadrature phase generator and It is recommended to include the baseband input impedance
LO buffers. in the baseband lowpass filter design. The input impedance
External I and Q baseband signals are applied to the of each baseband input is given in Table 1.
differential baseband input pins, BBPI, BBMI, and BBPQ,
Table 1. Single-Ended BB Port Input Impedance vs Frequency
BBMQ. These voltage signals are converted to currents and for EN = High and VCMBB = 0.5VDC
translated to RF frequency by means of double-balanced REFLECTION COEFFICIENT
FREQUENCY BB INPUT
up-converting mixers. The mixer outputs are combined (MHz) IMPEDANCE MAG ANGLE
in an RF output buffer, which also transforms the output
0.1 –10578 – j263 1.01 –0.02
impedance to 50Ω. The center frequency of the resulting
1 –8436 – j1930 1.011 –0.15
RF signal is equal to the LO signal frequency. The LO input
2 –6340 – j3143 1.013 –0.36
drives a phase shifter which splits the LO signal into in-
phase and quadrature LO signals. These LO signals are then 4 –3672 – j3712 1.014 –0.78

applied to on-chip buffers which drive the up-conversion 8 –1644 – j2833 1.015 –1.51
mixers. In most applications, the LOP input is driven by 16 –527 – j1765 1.016 –2.98
the LO source via an optional matching network, while 30 –177 – j1015 1.017 –5.48
the LOM input is terminated with 50Ω to RF ground via 60 –45.2 – j514 1.017 –11
a similar optional matching network. The RF output is 100 –13.2 – j306 1.014 –18.5
single-ended and internally 50Ω matched. 140 –0.2 – j219 1 –25.7
200 4.5 – j151 0.982 –36.6
Baseband Interface 300 10.4 – j99.4 0.921 –52.9
The circuit is optimized for a common mode voltage of 400 12.3 – j72.4 0.854 –68.2
0.5V which should be externally applied. The baseband 500 14.7 – j57.5 0.780 –79.9
pins should not be left floating because the internal 600 15.5 – j46.3 0.720 –91.4
PNP’s base current will pull the common mode voltage
higher than the 0.6V limit. This condition may damage The baseband inputs should be driven differentially;
the part. In shut-down mode, it is recommended to have otherwise, the even-order distortion products may degrade
a termination to ground or to a 0.5V source with a value the overall linearity performance. Typically, a DAC will
lower than 1kΩ. The PNP’s base current is about –68μA LTC5598
VCC2 = 5V
in normal operation.
BUFFER RF
The baseband inputs (BBPI, BBMI, BBPQ, BBMQ) present VCC1 = 5V
FROM
a single-ended input impedance of about –7.4kΩ each. Q

Because of the negative input impedance, it is important LOMI LOPI

to keep the source resistance at each baseband input low

BBPI
enough such that the parallel value remains positive vs 30Ω
baseband frequency. At each of the four baseband inputs, a VCMBB = 0.5VDC
4pF

capacitor of 4pF in series with 30Ω is connected to ground. 4pF

This is in parallel with a PNP emitter follower (see Figure 1). BBMI
30Ω

The baseband bandwidth depends on the source impedance. GNDRF

For a 25Ω source impedance, the baseband bandwidth GND

55682 F01

(–1dB) is about 300MHz. If a 5.6nH series inductor is

Figure 1. Simplified Circuit Schematic
of the LTC5598 (Only I-Half is Drawn)
5598f

9
LTC5598
APPLICATIONS INFORMATION
be the signal source for the LTC5598. A reconstruction in Table 3. In Table 4 and 5, the LOP port input impedance
filter should be placed between the DAC output and the is given for EN = High and Low under the condition of
LTC5598’s baseband inputs. PLO = 10dBm. Figure 4 shows the LOP port return loss
for the standard demo board (schematic is shown in
In Figure 2 a typical baseband interface is shown, using
Figure 10) when the LOM port is terminated with 50Ω to
a fifth-order lowpass ladder filter.
GND. The values of L1, L2, C9 and C10 are chosen such
0mA TO 20mA L1A L2A 0.5VDC BBPI that the bandwidth for the LOP port of the standard demo
R1A R2A board is maximized while meeting the LO input return loss
1007 1007
DAC C1 C2 C3 S11, ON < –10dB.
R1B R2B
1007 L1B L2B 1007
Table 2. LOP Port Input Impedance vs Frequency for EN = High
0mA TO 20mA 0.5VDC BBMI and PLO = 0dBm (LOM AC Coupled With 50Ω to Ground).
GND 5598 F02
FREQUENCY LO INPUT REFLECTION COEFFICIENT
(MHz) IMPEDANCE MAG ANGLE
Figure 2. Baseband Interface with 5th Order Filter
and 0.5VCM DAC (Only I Channel is Shown) 0.1 333 – j10.0 0.739 –0.5
1 318 – j59.9 0.737 –3.3
For each baseband pin, a 0 to 1V swing is developed 2 285 – j94.7 0.728 –6.1
corresponding to a DAC output current of 0mA to 20mA.
4 227 – j120 0.708 –10.6
The maximum sinusoidal single side-band RF output power
8 154 – j124 0.678 –18.7
is about +7.3dBm for full 0V to 1V swing on each I- and
16 89.9 – j95.4 0.611 –33.0
Q- channel baseband input (2VPP, DIFF).
30 60.4 – j60.6 0.420 –41.3

LO Section 60 54.8 – j35.8 0.489 –51.5

100 43.6 – j24.4 0.261 –89.9
The internal LO chain consists of poly-phase phase shifters 200 37.9 – j17.3 0.235 –113
followed by LO buffers. The LOP input is designed as a 400 31.8 – j12.4 0.266 –137
single-ended input with about 50Ω input impedance. The 800 23.6 – j8.2 0.374 –156
LOM input should be terminated with 50Ω through a DC
1000 19.8 – j5.5 0.437 –165
blocking capacitor.
1250 16.0 – j1.8 0.515 –175
The LOP and LOM inputs can be driven differentially in 1500 13.6 + j2.4 0.574 174
case an exceptionally low large-signal output noise floor 1800 12.1 + j7.3 0.618 162
is required (see graph 5598 G20b).
VCC1
A simplified circuit schematic for the LOP, LOM, CAPA
and CAPB inputs is given in Figure 3. A feedback path is
implemented from the LO buffer outputs to the LO inputs
in order to minimize offsets in the LO chain by storing the
LOP LOM CAPB
offsets on C5, C7 and C8 (see Figure 10). Optional capacitor
C8 improves the image rejection below 100MHz (see
CAPA
graph 5598 G20a). Because of the feedback path, the input
impedance for PLO = 0dBm is somewhat different than + 2.8V
(4.3V IN
for PLO = 10dBm for the lower part of the operating SHUTDOWN)
frequency range. In Table 2, the LOP port input impedance 5598 F03

vs frequency is given for EN = High and PLO = 0dBm. For

EN = Low and PLO = 0dBm, the input impedance is given Figure 3. Simplified Circuit Schematic for the
LOP, LOM, CAPA and CAPB Inputs.

5598f

10
 LTC5598
APPLICATIONS INFORMATION
Table 3. LOP Port Input Impedance vs Frequency for EN = Low Table 5. LOP Port Input Impedance vs Frequency for EN = Low
and PLO = 0dBm (LOM AC Coupled with 50Ω to Ground). and PLO = 10dBm (LOM AC Coupled with 50Ω to Ground).
FREQUENCY LO INPUT REFLECTION COEFFICIENT FREQUENCY LO INPUT REFLECTION COEFFICIENT
(MHz) IMPEDANCE MAG ANGLE (MHz) IMPEDANCE MAG ANGLE
0.1 1376 – j84.4 0.930 –0.3 0.1 454 – j30.5 0.802 –0.9
1 541 – j1593 0.980 –3.2 1 423 – j102 0.780 –3.2
2 177 – j877 0.977 –6.2 2 365 – j165 0.796 –5.9
4 75.3 – j452 0.965 –12.2 4 249 – j219 0.798 –11.4
8 49.2 – j228 0.918 –23.6 8 117 – j179 0.781 –22.4
16 43.3 – j117 0.784 –41.8 16 60.7 – j106 0.697 –40.3
30 40.7 – j64.1 0.585 –62.7 30 43.1 – j62.0 0.559 –62.4
60 39.1 – j34.6 0.382 –86
60 38.6 – j34.6 0.386 –86.7
100 37.6 – j23.8 0.296 –102
100 37.6 – j23.9 0.297 –102
200 33.4 – j16.4 0.275 –124
200 33.5 – j16.5 0.274 –124
400 27.5 – j11.1 0.320 –145
400 27.6 – j11.3 0.319 –145
800 20.1 – j4.9 0.430 –167
800 20.2 – j5.1 0.429 –166
1000 17.5 – j1.6 0.479 –176
1000 17.7 – j1.7 0.478 –175
1250 15.3 + j2.1 0.532 175
1250 15.2 + j2.0 0.533 175
1500 13.8 + j5.6 0.571 167
1500 13.9 + j5.4 0.570 167
1800 12.8 + j9.7 0.605 157
1800 12.9 + j9.5 0.604 158
Table 4. LOP Port Input Impedance vs Frequency for EN = High
and PLO = 10dBm (LOM AC Coupled with 50Ω to Ground). 0
FREQUENCY LO INPUT REFLECTION COEFFICIENT
(MHz) IMPEDANCE MAG ANGLE –5
0.1 360-j14.8 0.756 –0.7
RETURN LOSS (dB)

1 349-j70.5 0.758 –3.2 –10

2 311-j113 0.752 –6.0

–15
4 240-j148 0.739 –10.9 EN = LOW; PLO = 0dBm
EN = LOW; PLO = 10dBm
8 148-j146 0.715 –19.7 EN = HIGH; PLO = 0dBm
–20
EN = HIGH; PLO = 10dBm
16 81.3-j102 0.641 –35.2 C9, C10: 2.2pF; L1, L2: 3.3nH;
C5, C7: 10nF
30 55.4-j61.6 0.506 –54.7 –25
1 10 100 1000
60 45.7-j34.4 0.341 –77.4 FREQUENCY (MHz)
100 43.0-j24.1 0.261 –91.6 5598 F04

200 38.0-j17.1 0.234 –114 Figure 4. LOP Port Return Loss vs Frequency
400 32.0-j12.5 0.265 –137 for Standard Board (See Figure 10)
800 23.6-j8.3 0.374 –156
1000 19.8-j5.6 0.438 –165
1250 15.8-j1.7 0.520 –176
1500 13.5+j2.4 0.575 174
1800 12.0+j7.3 0.619 162

5598f

11
LTC5598
APPLICATIONS INFORMATION
The LOP port return loss for the low end of the operating The large-signal noise figure can be improved with a
frequency range can be optimized using extra 120Ω higher LO input power. However, if the LO input power is
terminations at the LO inputs (replace C9 and C10 with 120Ω too large and causes internal clipping in the phase shifter
resistors, see Figure 10), and is shown in Figure 5. section, the image rejection can be degraded rapidly. This
–4 clipping point depends on the supply voltage, LO frequency,
C9, C10: 120Ω; L1, L2: 0Ω; C5, C7: 100nF
temperature and single-ended vs differential LO drive. At
–6 EN = LOW; PLO = 0dBm fLO = 140MHz, VCC = 5V, T = 25°C and single-ended LO
drive, this clipping point is at about 16.6dBm. For 4.5V it
RETURN LOSS (dB)

EN = LOW; PLO = 10dBm

–5 lowers to 14.6dBm. For differential drive with VCC = 5V it
is about 20dBm.
–10
The differential LO port input impedance for EN = High
–12 and PLO = 10dBm is given in Table 6.
EN = HIGH; PLO = 10dBm
EN = HIGH; PLO = 0dBm Table 6. LOP - LOM Port Differential Input Impedance
–14 vs Frequency for EN = High and PLO = 10dBm
1 10 100 1000
FREQUENCY (MHz) FREQUENCY LO DIFFERENTIAL
5598 F05 (MHz) INPUT IMPEDANCE

Figure 5. LO Port Return Loss vs Frequency 0.1 642 – j25.7

Optimized for Low Frequency (See Figure 10) 1.0 626 – j112
2.0 572 – j204
The LOP port return loss for the high end of the operating
4.0 429 – j305
frequency range can be optimized using slightly different
values for C9, C10 and L1, L2 (see Figure 6). 8.0 222 – j287
16 102 – j181
0
30 64.2 – j104
60 50.9 – j58.9
–10 EN = LOW
100 46.2 – j40.2
RETURN LOSS (dB)

200 37.4 – j28.6

–20 400 28.3 – j19.4
EN = HIGH 800 20.0 – j10.6
–30 1000 17.5 – j7.9
1250 16.6 – j2.7
C9, C10: 2.7pF; L1, L2: 1.5nH; C5, C7: 10nF 1500 17.3 + j3.3
–40
1000 1200 1400 1600 1800 2000 1800 20.6 + j10.2
FREQUENCY (MHz)
5598 F06

RF Section
Figure 6. LO Port Return Loss vs Frequency
Optimized for High Frequency (See Figure 10) After upconversion, the RF outputs of the I and Q mixers are
combined. An on-chip buffer performs internal differential
The third-harmonic rejection on the applied LO signal is
to single-ended conversion, while transforming the output
recommended to be equal or better than the desired image
impedance to 50Ω. Table 7 shows the RF port output
rejection performance since third-harmonic LO content can
impedance vs frequency for EN = High.
degrade the image rejection severely. Image rejection is
not sensitive to second-harmonic LO content.

5598f

12
 LTC5598
APPLICATIONS INFORMATION
Table 7. RF Output Impedance vs Frequency for EN = High must be below 1V. If the EN pin is not connected, the chip
FREQUENCY RF OUTPUT REFLECTION COEFFICIENT is enabled. This EN = High condition is assured by the 125k
(MHz) IMPEDANCE MAG ANGLE on-chip pull-up resistor. It is important that the voltage at
0.1 59.0 – j0.6 0.083 –3.6
the EN pin does not exceed VCC by more than 0.3V. Should
1 58.5 – j2.1 0.081 –12.7 VCC2

2 57.3 – j3.5 0.076 –23.6

4 54.6 – j4.5 0.061 –41.6 1k

8 51.9 – j3.6 0.040 –60.8

4.6V
16 50.5 – j2.1 0.022 –74.8
FROM 2.8V
48Ω
30 50.2 – j1.1 0.011 –80 INTERNAL
MIXERS RF
60 50 – j0.5 0.005 –86.5
1.8V
100 50 – j0.2 0.002 –84.9
1V
200 49.7 + j0 0.003 177.4
48Ω
INTERNAL 1k
400 48.9 + j0.3 0.011 162 BIAS 5598 F07

800 46.1 + j0.4 0.041 173.3

1000 44.5 + j0.2 0.058 178 Figure 7. Simplified Circuit Schematic of the RF Output
1250 42.8 + j0 0.077 –179.7
0
1500 41.2 – j0.1 0.097 –179.4 EN = LOW
1800 39.9 + j0.4 0.113 177.4 –10

The RF port output impedance for EN = Low is given in Table

RETURN LOSS (dB)

–20
8. It is roughly equivalent to a 1.3pF capacitor to ground.
–30 EN = HIGH
Table 8. RF Output Impedance vs Frequency for EN = Low
–40
FREQUENCY LO INPUT REFLECTION COEFFICIENT
(MHz) IMPEDANCE MAG ANGLE –50
100 82.3 – j1223 0.995 –4.6 C6 = 220nF, SEE FIGURE 10
–60
200 51.1 – j618 0.987 –9.2 1 10 100 1000
FREQUENCY (MHz)
400 35.3 – j310 0.965 –18.1
5598 F08

800 24.4 – j148 0.906 –36.6

1000 20.4 – j114 0.878 –46.4
Figure 8. RF Port Return Loss vs Frequency
1250 17 – j87 0.847 –58.4 VCC1

1500 14.7 – j68 0.818 –70.7

1800 13.1 – j54 0.785 –84.3
125k
In Figure 7 the simplified circuit schematic of the RF 3V

output buffer is drawn. A plot of the RF port return loss vs 50k

EN INTERNAL
frequency is drawn in Figure 8 for EN = High and Low. ENABLE
2V
CIRCUIT
Enable Interface
Figure 9 shows a simplified schematic of the EN pin 5598 F09

interface. The voltage necessary to turn on the LTC5598

Figure 9: EN Pin Interface
is 2V. To disable (shut down) the chip, the enable voltage
5598f

13
LTC5598
APPLICATIONS INFORMATION
this occur, the supply current could be sourced through
the EN pin ESD protection diodes, which are not designed
to carry the full supply current, and damage may result.

Evaluation Board
Figure 10 shows the evaluation board schematic. A good
ground connection is required for the exposed pad. If this
is not done properly, the RF performance will degrade.
Additionally, the exposed pad provides heat sinking for the
part and minimizes the possibility of the chip overheating.
Resistors R1 and R2 reduce the charging current in
capacitors C1 and C4 (see Figure 10) and will reduce
supply ringing during a fast power supply ramp-up in
case an inductive cable is connected to the VCC and GND
turrets. For EN = High, the voltage drop over R1 and R2
is about 0.15V. If a power supply is used that ramps up
slower than 10V/μs and limits the overshoot on the supply
below 5.6V, R1 and R2 can be omitted. Figure 11. Component Side of Evaluation Board

The LTC5598 can be used for base-station applications

with various modulation formats. Figure 13 shows a
typical application.
J1 J2
BBMI BBPI
VCC

R1 R2
C1 C2 1Ω 5.6Ω
4.7μF 1nF

24 23 22 21 20 19 C3 C4
C9 EN 1nF 4.7μF
VCC1
GND
BBMI
BBPI
GND
GND

2.2pF
1 18
J3 C5 EN VCC2
L1 2 17
LOP 10nF GND GNDRF J4
3.3nH
3 16
LOP RF RF OUT
4 15
LOM NC C6
J5 L2 5 14
C7 GND GNDRF 10nF
3.3nH
LOM 10nF 6 13
CAPA NC
BBMQ

C10
BBPQ
CAPB

GND
GND

GND
GND

2.2pF

7 8 9 10 11 12 25
C8
470nF U1
J6 LTC5598 J7
GND
BBMQ BBPQ Figure 12. Bottom Side of Evaluation Board
5598 F10
BOARD NUMBER: DC1455A

Figure 10. Evaluation Circuit Schematic

5598f

14
 LTC5598
APPLICATIONS INFORMATION
5V
1nF 4.7μF
VCC 18, 24 x2 x2
21 LTC5598
I-DAC 22 V-I RF = 5MHz
13, 15 TO 1600MHz
I-CHANNEL NC

1 0o 16
EN PA
90o
10nF
Q-CHANNEL
10
Q-DAC 9 V-I 14, 17

BASEBAND 2, 5, 8, 11, 12, 4 3 6 7 5598 F13

GENERATOR 19, 20, 23, 25 10nF

10nF 470nF
50Ω
VCO/SYNTHESIZER

Figure 13: 5MHz to 1600MHz Direct

Conversion Transmitter Application

PACKAGE DESCRIPTION
UF Package
24-Lead (4mm × 4mm) Plastic QFN
(Reference LTC DWG # 05-08-1697)

0.70 p0.05

4.50 p 0.05 2.45 p 0.05

3.10 p 0.05 (4 SIDES)

PACKAGE OUTLINE

0.25 p0.05
0.50 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
BOTTOM VIEW—EXPOSED PAD
PIN 1 NOTCH
R = 0.20 TYP OR
4.00 p 0.10 0.75 p 0.05 R = 0.115 0.35 s 45o CHAMFER
(4 SIDES) TYP
23 24

PIN 1 0.40 p 0.10

TOP MARK
(NOTE 6) 1
2

2.45 p 0.10
(4-SIDES)

(UF24) QFN 0105

0.200 REF 0.25 p 0.05

0.00 – 0.05 0.50 BSC
NOTE:
1. DRAWING PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGD-X)—TO BE APPROVED
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE, IF PRESENT
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
5598f

15
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LTC5598
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PART NUMBER DESCRIPTION COMMENTS
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LT5517 40MHz to 900MHz Quadrature Demodulator 21dBm IIP3, Integrated LO Quadrature Generator
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LT5571 620MHz - 1100MHz High Linearity Quadrature 21.7dBm OIP3 at 900MHz, –159dBm/Hz Noise Floor, High-Ohmic 0.5VDC
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LT5579 1.5GHz to 3.8GHz High Linearity 27.3dBm OIP3 at 2.14GHz, 9.9dB Noise Floor, 2.6dB Conversion Gain,
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with Fast Comparator Output –26dBm to +12dBm Input Range
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5598f

LT 0509 • PRINTED IN USA

16 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2009