LTC1064

Low Noise, Fast, Quad

Universal Filter Building Block
U
FEATURES DESCRIPTIO
■ Four Filters in a 0.3 Inch Wide Package The LTC®1064 consists of four high speed, low noise
■ Maximum Center Frequency: 140kHz switched-capacitor filter building blocks. Each filter build-
■ Customized Version with Internal Resistors ing block, together with an external clock and three to five
Available resistors can provide various 2nd order functions like
■ One Half the Noise of the LTC1059/LTC1060/ lowpass, highpass, bandpass and notch. The center fre-
LTC1061 Devices quency of each 2nd order function can be tuned with an
■ Maximum Clock Frequency: 7MHz external clock, or a clock and resistor ratio. For Q ≤ 5, the
■ Clock-to-Center Frequency Ratio of 50:1 and 100:1 center frequency range is from 0.1Hz to 100kHz. For Q ≤
Simultaneously Available 3, the center frequency range can be extended to 140kHz.
■ Power Supplies: ±2.375V to ±8V Up to 8th order filters can be realized by cascading all four
■ Low Offsets 2nd order sections. Any classical filter realization (such as
■ Low Harmonic Distortion Butterworth, Cauer, Bessel and Chebyshev) can be formed.
■ Available in 24-Pin DIP and SO Wide Packages A customized monolithic version of the LTC1064 includ-
U ing internal thin film resistors can be obtained for high
APPLICATIO S volume applications. Consult LTC Marketing for details.
■ Anti-Aliasing Filters , LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corporation.
■ Wide Frequency Range Tracking Filters All other trademarks are the property of their respective owners.
■ Spectral Analysis
■ Loop Filters

U
TYPICAL APPLICATIO
Clock-Tunable 8th Order Cauer Lowpass Filter with fCUTOFF up to 100kHz
13k
66.5k RH2
102k
22.1k 1 24
PIN 12 Gain vs Frequency
VIN INV B INV C
10k 2 23 10k
HPB/NB HPC/NC 0
18.25k 3 22 12.1k
BPB BPC –15
10.7k 4 21 17.4k RL2
LPB LPC 26.7k –30
5 20
SB SC –45
GAIN (dB)

fCLK = 5MHz
6
AGND V – 19 –60 RIPPLE = ±0.1dB
–8V
7 LTC1064 18 0.1µF
8V V+ CLK 5MHz –75
0.1µF fCLK = 1MHz
8 17
SA 50/100 8V –90 RIPPLE = ±0.05dB
10k 9 16 VOUT
LPA LPD –105
49.9K 10 15 41.2k
–120
BPA BPD
11.5K 11 14 12.7k –135
HPA/NA HPD 1k 10k 100k 1M
12 13 14k
(FROM INPUT FREQUENCY (Hz)
INV A INV D
RH2, RL2) 121k 1064 TA02

10k

FOR fCLK = 5MHz, ADD C1 = 10pF BETWEEN PINS 4, 1 WIDEBAND NOISE ≅ 140µVRMS
C2 = 10pF BETWEEN PINS 21, 24
C3 = 27pF BETWEEN PINS 9, 12 1064 TA01

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LTC1064
W W W U
ABSOLUTE AXI U RATI GS (Note 1)
Total Supply Voltage (V + to V –) ............................. 16V Storage Temperature Range ................ – 65°C to 150°C
Power Dissipation ............................................. 500mW Lead Temperature (Soldering, 10 sec)................. 300°C
Operating Temperature Range
LTC1064AC/LTC1064C .................... – 40°C to 85°C
LTC1064AM
LTC1064M (OBSOLETE) ............... – 55°C to 125°C

W U U
PACKAGE/ORDER I FOR ATIO
TOP VIEW ORDER PART TOP VIEW ORDER PART
INV B 1 24 INV C NUMBER INV B 1 24 INV C NUMBER
HPB/NB 2 23 HPC/NC HPB/NB 2 23 HPC/NC
BPB 3 22 BPC LTC1064ACN BPB 3 22 BPC LTC1064CSW
LPB 4 21 LPC LTC1064CN LPB 4 21 LPC
SB 5 20 SC SB 5 20 SC
AGND 6 19 V – AGND 6 19 V –
V+ 7 18 CLK V+ 7 18 CLK
SA 8 17 50/100 SA 8 17 50/100
LPA 9 16 LPD LPA 9 16 LPD
BPA 10 15 BPD BPA 10 15 BPD
HPA/NA 11 14 HPD HPA/NA 11 14 HPD
INV A 12 13 INV D INV A 12 13 INV D

N PACKAGE SW PACKAGE
24-LEAD PLASTIC DIP 24-LEAD PLASTIC SO WIDE
TJMAX = 110°C, θJA = 65°C/W TJMAX = 100°C, θJA = 85°C/ W

LTC1064ACJ
J PACKAGE 24-LEAD CERAMIC DIP LTC1064CJ
TJMAX = 150°C, θJA = 100°C/W
LTC1064AMJ
LTC1064MJ
OBSOLETE PACKAGE
Consider the 24-Lead N Package as an Alternate Source

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS (Internal Op Amps) The ● denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage Range ±2.375 ±8 V
Voltage Swings VS = ±5V, RL = 5k ±3.2 ±3.6 V
● ±3.1 V
Output Short-Circuit Current (Source/Sink) VS = ±5V 3 mA
DC Open-Loop Gain VS = ±5V, RL = 5k 80 dB
GBW Product VS = ±5V 7 MHz
Slew Rate VS = ±5V 10 V/µs
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 LTC1064
ELECTRICAL CHARACTERISTICS (Complete Filter) The ● denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at VS = ±5V, TA = 25°C, TTL clock input level, unless otherwise specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Center Frequency Range, fO VS = ±8V, Q ≤ 3 0.1 to 140 kHz
Input Frequency Range 0 to 1 MHz
Clock-to-Center Frequency LTC1064 fCLK = 1MHz, fO = 20kHz, Pin 17 High 50 ± 0.3 %
Ratio, fCLK /fO LTC1064A (Note 2) Sides A, B, C: Mode 1, ● 50 ± 0.8 %
R1 = R3 = 5k, R2 = 5k, Q = 10,
Sides D: Mode 3, R1 = R3 = 50k ● 50 ± 0.9 %
R2 = R4 = 5k
LTC1064 Same as Above, Pin 17 Low, fCLK = 1MHz 100 ± 0.3 %
LTC1064A (Note 2) fO = 10kHz
Sides A, B, C ● 100 ± 0.8 %
Side D ● 100 ± 0.9
Clock-to-Center Frequency LTC1064 fCLK = 1MHz 0.4 %
Ratio, Side-to-Side Matching LTC1064A (Note 2) ● 1 %
Clock-to-Center Frequency LTC1064 fCLK = 4MHz, fO = 80kHz, Pin 17 High 50 ± 0.6 %
Ratio, fCLK/fO (Note 3) LTC1064A (Note 2) Sides A, B, C: Mode 1, VS = ±7.5V 50 ± 1.3 %
R1 = R3 = 50k, R2 = 5k, Q = 5
Side D: Mode 3, R1 = R3 = 50k
R2 = R4 = 5k, fCLK = 4MHz
LTC1064 Same as Above, Pin 17 Low 100 ± 0.6 %
LTC1064 A (Note 2) fCLK = 4MHz, fO = 40kHz 100 ± 1.3 %
Q Accuracy Sides A, B, C: Mode 1, Q = 10 ● ±2 6 %
Side D: Mode 3, fCLK = 1MHz ● ±3 8 %
fO Temperature Coefficient Mode 1, 50:1, fCLK < 2MHz ±1 ppm/°C
Q Temperature Coefficient Mode 1, 100:1, fCLK < 2MHz ±5 ppm/°C
Mode 3, fCLK < 2MHz ±5 ppm/°C
DC Offset Voltage VOS1 (Table 1) fCLK = 1MHz, 50:1 or 100:1 ● 2 15 mV
VOS2 (Table 1) fCLK = 1MHz, 50:1 or 100:1 ● 3 45 mV
VOS3 (Table 1) fCLK = 1MHz, 50:1 or 100:1 ● 3 45 mV
Clock Feedthrough fCLK < 1MHz 0.2 mVRMS
Maximum Clock Frequency Mode 1, Q < 5, VS ≥ ±5V 7 MHz
Power Supply Current 9 12 23 mA
● 26 mA

Note 1: Absolute Maximum Ratings are those values beyond which the life Note 2: Contact LTC Marketing.
of a device may be impaired. Note 3: Not tested, guaranteed by design.

Table 1. Output DC Offsets, One 2nd Order Section

VOSN VOSBP VOSLP
MODE PINS 2, 11, 14, 23 PINS 3, 10, 15, 22 PINS 4, 9, 16, 21
1 VOS1 [(1/Q) + 1 + ⏐⏐HOLP⏐⏐] – VOS3 /Q VOS3 VOSN – VOS2
1b VOS1 [(1/Q) + 1 + (R2/R1)] – VOS3 /Q VOS3 ~(VOSN – VOS2)[1 + (R5/R6)]
2 VOS1 [(1 + (R2/R1) + (R2/R3) + (R2/R4) – VOS3 (R2/R3)] VOS3 VOSN – VOS2
× [R4/(R2 + R4)] + VOS2[R2/(R2 + R4)]
3 VOS2 VOS3 VOS1[1 + (R4/R1) + (R4/R2) + (R4/R3)]
– VOS2(R4/R2) – VOS3(R4/R3)

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LTC1064
W
BLOCK DIAGRA
HPA/NA BPA LPA
(11) (10) (9)
V + (7)
INV A
(12)
–
+
Σ
50/100 (17)
+∫ +∫
AGND
(6) + – CLK (18)
HPB/NB BPB LPB
(2) (3) (4) V – (19)
SA
INV B (8)
(1) –
+
Σ +∫ +∫
+ –
HPC/NC BPC LPC
(23) (22) (21)
SB
(5)
INV C BY TYING PIN 17 TO V +, ALL SECTIONS
(24) – OPERATE WITH (fCLK/fO) = 50:1
+
Σ +∫ +∫ BY TYING PIN 17 TO V –, ALL SECTIONS
OPERATE WITH (fCLK/fO) = 100:1
+ –
BY TYING PIN 17 TO AGND, SECTIONS B, C
HPD BPD LPD OPERATE WITH (fCLK/fO) = 50:1 AND
(14) (15) (16) SECTIONS A, D OPERATE AT 100:1
SC
(20)
INV D
(13) –
+∫ +∫ 1064 BD

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TYPICAL PERFORMANCE CHARACTERISTICS
Mode 1, (fCLK /fO) = 50:1 Mode 1, (fCLK /fO) = 100:1 Mode 2, (fCLK /fO) = 25:1
TA = 25°C TA = 25°C TA = 25°C
Q=5 Q=5 Q = 10
20 Q = 10 20 Q = 10 20 PIN 17 AT V +
15 VS = ±5V 15 VS = ±5V 15 (R2/R4) = 3
Q ERROR (%)
Q ERROR (%)
Q ERROR (%)

10 10 VS = ±7.5V 10 VS = ±2.5V
VS = ±2.5V
5 VS = ±7.5V 5 5 CC = 15pF VS = ±5V
CC = 15pF
0 0 0
–5 –5 VS = ±2.5V –5
TA = 25°C TA = 25°C
Q = 5 OR 10 VS = ±7.5V Q = 5 OR 10
CENTER FREQUENCY
CENTER FREQUENCY

VS = ±5V
CENTER FREQUENCY

1.5 VS = ±5V 1.5 1.5

1.0 VS = ±2.5V
ERROR (%)
ERROR (%)
ERROR (%)

1.0 VS = ±2.5V 1.0

VS = ±7.5V VS = ±5V
0.5 0.5 0.5 VS = ±2.5V
0 0 0
0 10 20 30 40 50 60 70 80 90 100110 120 0 10 20 30 40 50 60 70 80 90 100110 120 0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz) CENTER FREQUENCY (kHz) CENTER FREQUENCY (kHz)
1064 G01 1064 G02 1064 G03

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 LTC1064
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TYPICAL PERFORMANCE CHARACTERISTICS
Mode 2, (fCLK /fO) = 25:1 Mode 2, (fCLK /fO) = 50:1 Mode 3, (fCLK /fO) = 50:1

TA = 25°C TA = 25°C
VS = ±7.5V PIN 17 AT V – TA = 25°C
20
VS = ±2.5V VS = ±5V
PIN 17 AT V + 20
(R2/R4) = 3 CC = 5pF
15 (R2/R4) = 3 15 Q=5 20 R2 = R4
Q ERROR (%)

Q ERROR (%)
Q = 10 VS = ±5V
10 10 15 Q=5

Q ERROR (%)
Q=5 Q=2 VS = ±7.5V VS = ±2.5V Q = 10
5 CC = 22pF CC = 39pF 5 10
0 0 5 VS = ±7.5V
–5 –5 0
–5
CENTER FREQUENCY

CENTER FREQUENCY
1.5 1.5 VS = ±5V

CENTER FREQUENCY
ERROR (%)

ERROR (%)
1.0 Q=5 Q=2 1.0 1.5
VS = ±2.5V VS = ±5V

ERROR (%)
0.5 0.5 VS = ±7.5V 1.0
VS = ±2.5V VS = ±7.5V
0 0 0.5
0 20 40 60 80 100 120140160180 200 0 10 20 30 40 50 60 70 80 90 100110 120
0
CENTER FREQUENCY (kHz) CENTER FREQUENCY (kHz) 0 10 20 30 40 50 60 70 80 90 100110 120
1064 G04 1064 G05 CENTER FREQUENCY (kHz)
1064 G06

Mode 3, (fCLK /fO) = 50:1 Mode 3, (fCLK /fO) = 100:1 Wideband Noise vs Q
240
TA = 25°C TA = 25°C 220 ANY OUTPUT
CC = 15pF CC = 5pF R3 = R1
20 R2 = R4 20 200
VS = ±2.5V R2 = R4 ONE SECOND ORDER

WIDEBAND NOISE (µV/RMS)

15 VS = ±7.5V 15 VS = ±5V Q = 10 180 SECTION
Q ERROR (%)

Q ERROR (%)

10 Q=2 10 160 MODE 1 OR 3 ±7.5V

100:1 OR 50:1 ±5V
5 5 VS = ±7.5V 140
Q=1 ±2.5V
0 0 120
–5 –5 100
VS = ±5V
VS = ±2.5V 80
CENTER FREQUENCY

CENTER FREQUENCY

1.5 VS = ±7.5V
1.5 60
VS = ±2.5V
ERROR (%)

VS = ±7.5V
ERROR (%)

1.0 VS = ±5V 1.0 40

0.5 0.5 20
0 0 0
0 10 20 30 40 50 60 70 80 90 100 110 120 0 10 20 30 40 50 60 70 80 90 100110 120 0 2 4 6 8 10 12 14 16 18 20 22 24
CENTER FREQUENCY (kHz) CENTER FREQUENCY (kHz) Q
1064 G07 1064 G08 1064 G09

Harmonic Distortion, 8th Order

Power Supply Current vs LP Butterworth, fC = 20kHz,
Supply Voltage THD = 0.015% for 3VRMS Input
48
44
POWER SUPPLY CURRENT (mA)

40
36
32
28
24
–55°C
20 25°C
16 125°C
12
8
4
0
1064 G11
0 2 4 6 8 10 12 14 16 18 20 22 24
POWER SUPPLY VOLTAGE (V + – V –)
1064 G10

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LTC1064
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PIN FUNCTIONS
V +, V – (Pins 7, 19): Power Supplies. They should be AGND (Pin 6): Analog Ground. When the LTC1064 oper-
bypassed with a 0.1µF ceramic capacitor. Low noise, ates with dual supplies, Pin 6 should be tied to system
nonswitching power supplies are recommended. The de- ground. When the LTC1064 operates with a single positive
vice operates with a single 5V supply and with dual supply, the analog ground pin should be tied to 1/2 supply
supplies. The absolute maximum operating power supply and it should be bypassed with a 1µF solid tantalum in
voltage is ±8V. parallel with a 0.1µF ceramic capacitor, Figure 1. The
CLK (Pin 18): Clock. For ±5V supplies the logic threshold positive input of all the internal op amps, as well as the
level is 1.4V. For ±8V and 0V to 5V supplies the logic common reference of all the internal switches, are inter-
threshold levels are 2.2V and 3V respectively. The logic nally tied to the analog ground pin. Because of this, a very
threshold levels vary ±100mV over the full military tem- “clean” ground is recommended.
perature range. The recommended duty cycle of the input 50/100 (Pin 17): By tying Pin 17 to V +, all filter sections
clock is 50%, although for clock frequencies below 500kHz, operate with a clock-to-center frequency ratio internally
the clock “on” time can be as low as 200ns. The maximum set at 50:1. When Pin 17 is at mid-supplies, sections B and
clock frequency for ±5V supplies is 4MHz. For ±7V C operate with (fCLK /fO) = 50:1 and sections A and D
supplies and above, the maximum clock frequency is operate at 100:1. When Pin 17 is shorted to the negative
7MHz. supply pin, all filter sections operate with (fCLK /fO) =
100:1.

1 24
2 23
V+ 3 LTC1064 22
4 21

5k 5 20
V+/2 6 19
AGND V– CLOCK INPUT
+ 7
V+ CLK
18 V + = 15V, TRIP VOLTAGE = 7V
1µF 5k V + = 10V, TRIP VOLTAGE = 6.4V
0.1µF 8 17 V + = 5V, TRIP VOLTAGE = 3V
50/100
9 16
10 15
TO DIGITAL
11 14 GROUND
ANALOG
GROUND 12 13
PLANE

1064 F01

NOTE: PINS 5, 8, 20, IF NOT USED, SHOULD BE CONNECTED TO PIN 6

Figure 1. Single Supply Operation

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 LTC1064
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APPLICATIONS INFORMATION
ANALOG CONSIDERATIONS
Grounding and Bypassing Figure 2 shows an example of an ideal ground plane
design for a 2-sided board. Of course this much ground
The LTC1064 should be used with separated analog and
plane will not always be possible, but users should strive
digital ground planes and single point grounding
to get as close to this as possible. Protoboards are not
techniques.
recommended.
Pin 6 (AGND) should be tied directly to the analog ground
plane. Buffering the Filter Output
Pin 7 (V +) should be bypassed to the ground plane with a When driving coaxial cables and 1× scope probes, the
0.1µF ceramic capacitor with leads as short as possible. filter output should be buffered. This is important espe-
Pin 19 (V –) should be bypassed with a 0.1µF ceramic cially when high Qs are used to design a specific filter.
capacitor. For single supply applications, V – can be tied to Inadequate buffering may cause errors in noise, distor-
the analog ground plane. tion, Q and gain measurements. When 10 × probes are
For good noise performance, V + and V – must be free of used, buffering is usually not required. An inverting buffer
is recommended especially when THD tests are per-
noise and ripple.
formed. As shown in Figure 3, the buffer should be
All analog inputs should be referenced directly to the adequately bypassed to minimize clock feedthrough.
single point ground. The clock inputs should be shielded
from and/or routed away from the analog circuitry and a
separate digital ground plane used.

1 PIN 1 IDENT 24 VIN

2 23 FOR BEST HIGH FREQUENCY RESPONSE

PLACE RESISTORS PARALLEL TO DOUBLE-
3 22 5k SIDED COPPER CLAD BOARD AND LAY FLAT
(4 RESISTORS SHOWN HERE TYPICAL)
4 21

–7.5V
5 20 0.1µF CERAMIC
LTC1064

6 19

7.5V 7 18 CLOCK

8 17 DIGITAL
GROUND
0.1µF
9 16 PLANE
CERAMIC
(SINGLE POINT
10 15 GROUND)

ANALOG 11 14
GROUND NOTE: CONNECT ANALOG AND DIGITAL
PLANE GROUND PLANES AT A SINGLE POINT AT
12 13
THE BOARD EDGE

1064 F02

Figure 2. Example Ground Plane Breadboard Technique for LTC1064

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LTC1064
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APPLICATIONS INFORMATION
Offset Nulling Noise
Lowpass filters may have too much DC offset for some All the noise performance mentioned excludes the clock
users. A servo circuit may be used to actively null the feedthrough. Noise measurements will degrade if the
offsets of the LTC1064 or any LTC switched-capacitor already described grounding bypassing and buffering
filter. The circuit shown in Figure 4 will null offsets to better techniques are not practiced. The graph Wideband Noise
than 300µV. This circuit takes seconds to settle because of vs Q in the Typical Performance Characteristics section is
the integrator pole frequency. a very good representation of the noise performance of
this device.
SEPARATE V + POWER SUPPLY TRACE FOR BUFFER
R12

R11 + FROM
VIN 0.1µF 1µF FILTER OUTPUT
R21 R22

R32 10k
R31
10k R1
– 4
1M
+
V TRACE FOR FILTER LT ®318
LT1007 VOUT
R3 +
19 TO FILTER 100k C1
LT1056 FIRST SUMMING LT1012
LTC1064 0.1µF
POSITIVE 7 0.1µF + 7 NODE
SUPPLY –
0.1µF
NEGATIVE 0.1µF + 1µF C2 R2
SUPPLY C1 = C2 = LOW LEAKAGE FILM 0.1µF 1M
(I.E., POLYPROPYLENE)
R1 = R2 = METAL FILM 1%
1064 F04

1064 F03

Figure 3. Buffering the Output of a 4th Order Bandpass Realization Figure 4. Servo Amplifier

W U
ODES OF OPERATIO
PRIMARY MODES
Mode 1 R3

In Mode 1, the ratio of the external clock frequency to the R2

N S BP LP
center frequency of each 2nd order section is internally
R1
fixed at 50:1 or 100:1. Figure 5 illustrates Mode 1 provid- VIN – –
+
ing 2nd order notch, lowpass and bandpass outputs. Σ ∫ ∫
Mode 1 can be used to make high order Butterworth +
lowpass filters; it can also be used to make low Q notches 1/4 LTC1064

and for cascading 2nd order bandpass functions tuned at AGND

the same center frequency with unity gain. Mode 1 is faster

fCLK R2 R3 R2 R3
than Mode 3. Note that Mode 1 can only be implemented fO = ;f =f ;H
100(50) n O OLP
=–
R1
; HOBP = – ;H
R1 ON1
=–
R1
;Q=
R2
with three of the four LTC1064 sections because Section 1064 F05

D has no externally available summing node. Section D,

however, can be internally connected in Mode 1 upon Figure 5. Mode 1: 2nd Order Filter Providing Notch,
Bandpass and Lowpass
special request.
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 LTC1064
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ODES OF OPERATIO
Mode 3 SECONDARY MODES
Mode 3 is the second of the primary modes. In Mode 3, the Mode 1b
ratio of the external clock frequency to the center fre-
Mode 1b is derived from Mode 1. In Mode 1b, Figure 7, two
quency of each 2nd order section can be adjusted above or
additional resistors R5 and R6 are added to alternate the
below 50:1 or 100:1. Side D of the LTC1064 can only be
amount of voltage fed back from the lowpass output into
connected in Mode 3. Figure 6 illustrates Mode 3, the
the input of the SA (or SB or SC) switched-capacitor
classical state variable configuration, providing highpass,
summer. This allows the filter’s clock-to-center frequency
bandpass and lowpass 2nd order filter functions. Mode 3
ratio to be adjusted beyond 50:1 or 100:1. Mode 1b
is slower than Mode 1. Mode 3 can be used to make high
maintains the speed advantages of Mode 1.
order all-pole bandpass, lowpass, highpass and notch
filters. R6 R5

When the internal clock-to-center frequency ratio is set at R3

50:1, the design equations for Q and bandpass gain are R2
different from the 100:1 case. This was done to provide N S BP LP

speed without penalizing the noise performance. VIN

R1
–
+ –
Σ ∫ ∫
CC + 1064 F07

1/4 LTC1064
R4
AGND
R3

R2

√R5R6+ R6 ; f = f √R5R6+ R6 ;
HP S BP LP fCLK R3
fO = n O; Q =
100(50) R2
R1
–
( )
VIN R2
+ –
Σ f R2 R1
∫ ∫ HON1(f→ 0) = HON2 f→ CLK
2
=– ; HOLP = –
R1 R6
;

+ 1064 F06 R5 + R6
1/4 LTC1064
R3
HOBP = – ; R5⏐⏐R6 ≤ 5k
R1 1064 F07 Eq
AGND

Figure 7. Mode 1b: 2nd Order Filter Providing Notch,

Bandpass and Lowpass
MODE 3 (100:1):
f
fO = CLK
100 √ R2R4 ; Q = R3R2 √ R2R4 ; HOHP = –
R2
R1
;

R3 R4
HOBP = – ;H =–
R1 OLP R1
Mode 2
MODE 3 (50:1):
f
fO = CLK
√ R2
;Q=
R2
1.005 R4 √; Mode 2 is a combination of Mode 1 and Mode 3, as shown
50 R4 R2 R2
–
R3 16R4 in Figure 8. With Mode 2, the clock-to-center frequency
R3
R2 R1 R4 ratio fCLK /fO is always less than 50:1 or 100:1. The
HOHP = – ;H =– ; HOLP = –
R1 OBP R3 R1 advantage of Mode 2 is that it provides less sensitivity to
1–
16R4
resistor tolerances than does Mode 3. As in Mode 1,
NOTE: THE 50:1 EQUATIONS FOR MODE 3 ARE DIFFERENT FROM THE EQUATIONS
FOR MODE 3 OPERATIONS OF THE LTC1059, LTC1060 AND LTC1061. START WITH Mode 2 has a notch output which depends on the clock
fO, CALCULATE R2/R4, SET R4; FROM THE Q VALUE, CALCULATE R3:
frequency and the notch frequency is therefore less than
R2
R3 = ; THEN CALCULATE R1 TO SET the center frequency fO.
1.005
Q √ R2 + R2 THE DESIRED GAIN.
R4 16R4
1064 F06 Eq

When the internal clock-to-center frequency ratio is set at

50:1, the design equations for Q and bandpass gain are
Figure 6. Mode 3: 2nd Order Filter Providing Highpass,
Bandpass and Lowpass different from the 100:1 case.
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LTC1064
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ODES OF OPERATIO
R2
R4
√ √
f R2 f R3 R2 R1
MODE 2 (100:1): fO = CLK 1+ ; f = CLK ; Q = 1+ ; HOLP = – ;
R3 100 R4 n 50 R2 R4 R2
1+
R4

( )
R2
R2 R3 R1 f R2
N S BP LP HOBP = – ; H (f→ 0) = – ; HON2 f→ CLK=–
R1 ON1 R2 2 R1
1+
R1 R4
VIN –
√
+ – R2 R2
Σ
1.005 1 +

+
∫ ∫ MODE 2 (50:1):
f
fO = CLK
50 √ 1+
R2
;f =
R4 n 50
fCLK
;Q=
R2
–
R2
R4 ; HOLP = –
R1
1+
R2
;

R3 16R4 R4
1064 F08
1/4 LTC1064

( )
R3 R2
AGND R1 R1 f R2
HOBP = – ; HON1(f→ 0) = – ;H = f→ CLK= –
R3 R2 ON2 2 R1
1– 1+
16R4 R4
NOTE: THE 50:1 EQUATIONS FOR MODE 2 ARE DIFFERENT FROM THE EQUATIONS
FOR MODE 2 OPERATION OF THE LTC1059, LTC1060 AND LTC1061. START WITH
fO, CALCULATE R2/R4, SET R4; FROM THE Q VALUE, CALCULATE R3:
R2
R3 = ; THEN CALCULATE R1 TO SET THE DESIRED GAIN.
1.005
Q √ 1+
R2
+
R2
R4 16R4 1064 F08Eq

Figure 8. Mode 2: 2nd Order Filter Providing Notch, Bandpass and Lowpass

Mode 3a outputs can be summed directly into the inverting input of

the next section. The topology of Mode 3a is useful for
This is an extension of Mode 3 where the highpass and
elliptic highpass and notch filters with clock-to-cutoff
lowpass outputs are summed through two external resis-
frequency ratios higher than 100:1. This is often required
tors RH and RL to create a notch. This is shown in Figure 9.
to extend the allowed input signal frequency range and to
Mode 3a is more versatile than Mode 2 because the notch
avoid premature aliasing.
frequency can be higher or lower than the center fre-
quency of the 2nd order section. The external op amp of When the internal clock-to-center frequency ratio is set at
Figure 9 is not always required. When cascading the 50:1, the design equations for Q and bandpass gain are
sections of the LTC1064, the highpass and lowpass different from the 100:1 case.

√ R2R4 ; f = 100 √ R ; H
f fCLK RH R2 R3
MODE 3a (100:1): fO = CLK n OHP = – ; HOBP = – ;
100 L R1 R1

CC HOLP = –
R4
R1 ON1
R R4
; H (f→ 0) = G ;H ( )( ) (
RL R1 ON2
f
f→ CLK
2
= ) ( )( )
RG R2
;
RH R1

R4 HON(f = fO) = Q ( RG
H
R
– GH
RL OLP RH OHP
;Q= )
R3
R2 √ R2R4
( )
R3
√1 + R2R4 ; f = f50 √
f RH f R2
MODE 3a (50:1): fO = CLK n
CLK ; HOHP f→ CLK = – ;
R2 50 RL 2 R1
HP S BP LP RG

√
R3 R2
R1 1.005
– R1 R4 R4
VIN – + RL HOBP = – ; HOLP(f = 0) = – ;Q =
Σ ∫ ∫ – 1–
R3
16R4
R1 R2
–
R2
R3 16R4
+ NOTCH
1/4 LTC1064 + NOTE: THE 50:1 EQUATIONS FOR MODE 3A ARE DIFFERENT FROM
THE EQUATIONS FOR MODE 3A OPERATION OF THE LTC1059,
AGND RH LTC1060 AND LTC1061. START WITH fO, CALCULATE R2/R4, SET R4;
EXTERNAL OP AMP OR INPUT FROM THE Q VALUE, CALCULATE R3:
OP AMP OF THE LTC1064, R2
R3 = ; THEN CALCULATE R1 TO

√ R2R4 + 16R4
SIDE A, B, C, D 1.005 R2 SET THE DESIRED GAIN.
1064 F09 1064 F09Eq
Q

Figure 9. Mode 3a: 2nd Order Filter Providing Highpass, Bandpass, Lowpass and Notch
1064fb

10
 LTC1064
U
TYPICAL APPLICATIO S
Wideband Bandpass: Ratio of High to Low Corner Frequency Equal to 2
R14

1 24 Amplitude Response
INV B INV C
R23 2 23 R24 15
HPB/NB HPC/NC
R33 3 22 R34 0
BPB BPC fCLK = 7MHz
R43 4 21 R44
LPB LPC –15
5 20 VOUT
SB SC –30

GAIN (dB)
6 19
C1 AGND V– –5V TO –8V –45
7 LTC1064 18 0.1µF fCLK = 2MHz
5V TO 8V V+ CLK fCLK ≤ 7MHz
0.1µF –60
8 17
SA 50/100
R41 9 16 –75
LPA LPD C2
R31 10 15 R42
BPA BPD –90
R21 R32 VS = ±8V
11 14
HPA/NA HPD –105
R11 12 13 R22 10k 100k 1M
VIN INV A INV D INPUT FREQUENCY (Hz)
R12
R13 1064 TA04

RESISTOR VALUES:
R11 = 16k R21 = 16k R31 = 7.32k R41 = 10k
R12 = 10k R22 = 10k R32 = 22.6k R42 = 13.3k
R13 = 23.2k R23 = 13.3k R33 = 21.5k R43 = 10k
R14 = 6.8k R24 = 20k R34 = 15.4k R44 = 32.4k
NOTE: FOR fCLK ≥ 3MHz, USE C1 = C2 = 22pF 1064 TA03

Quad Bandpass Filter with Center Frequency Equal to fO, 2fO, 3fO and 4fO
10.5k
R12 1 24 R13 Amplitude Response
VIN1 INV B INV C VIN2
R22 2 23 R23 5
HPB/NB HPC/NC fCLK = 2MHz
R32 3 22 R33 0
BPB BPC
4 21 R43 –5
LPB LPC
5 20 –10
SB SC
GAIN (dB)

6 19 –15
AGND V– –5V TO –8V
7 LTC1064 18 –20
5V TO 8V V+ CLK fCLK 0.1µF
8 17 –25
0.1µF SA 50/100
9 16 R44
LPA LPD –30
R31 10 15 R34
BPA BPD –35
R21 11 14 R24
HPA/NA HPD –40
R11 12 13 R14 0 10 20 30 40 50
VIN3 INV A INV D VIN4
INPUT FREQUENCY (kHz)
17.4k 20k
1064 TA06

20k

20k
–
RESISTOR VALUES: LT1056 VOUT
R11 = 249k R21 = 10k R31 = 249k
R12 = 249k R22 = 10k R32 = 249k +
R13 = 499k R23 = 10k R33 = 174k R43 = 17.8k
R14 = 453k R24 = 10k R34 = 249k R44 = 40.2k 1064 TA05

1064fb

11
LTC1064
U
TYPICAL APPLICATIO S
8th Order Bandpass Filter with 2 Stopband Notches
RL2

RH2
RH3 Amplitude Response
R12 1 24
INV B INV C 10
R22 R23 VS = ±5V
2 23 fCLK = 1.28MHz
HPB/NB HPC/NC 0
R32 3 22 R33 PIN 17 AT V +
BPB BPC –10
R42 4 21 R43
LPB LPC RL3
–20

GAIN (dB)
5 20
SB SC
6 19 –30
AGND V– –5V TO –8V
7 LTC1064 18 0.1µF –40
5V TO 8V V+ CLK 1.28MHz
8 17
0.1µF SA 50/100 TO V + –50
R41 9 16 R44
LPA LPD –60
R31 10 15 R34
BPA BPD –70
R21 11 14 R24 1 5 10 20 40 100
HPA/NA HPD
R11 INPUT FREQUENCY (kHz)
12 13
VIN INV A INV D 1064 TA08

VOUT
RESISTOR VALUES:
R11 = 46.95k R21 = 10k R31 = 38.25k R41 = 11.81k
R12 = 93.93k R22 = 10k R32 = 81.5k R42 = 14.72k RL2 = 27.46k RH2 = 6.9k
R23 = 16.3k R33 = 70.3k R43 = 10k RL3 = 17.9k RH3 = 69.7k
R24 = 13.19k R34 = 39.42k R44 = 10.5k
NOTE 1: THE V +, V – PINS SHOULD BE BYPASSED WITH A 0.1µF TO 0.22µF
CERAMIC CAPACITOR, RIGHT AT THE PINS.
NOTE 2: THE RATIOS OF ALL (R2/R4) RESISTORS SHOULD BE MATCHED
TO BETTER THAN 0.25%. THE REMAINING RESISTORS SHOULD BE
1064 TA07
BETTER THAN 0.5% ACCURATE.

C-Message Filter
R13

1 24
Amplitude Response
INV B INV C
10
R22 2 23 R23
HPB/NB HPC/NC VS = ±5V
R32 R33 0
3 22
BPB BPC
R42 4 21 R43 –10
LPB LPC
5 20 0.1µF –20
SB SC R14
GAIN (dB)

6 19
AGND V– –5V –30
7 LTC1064 18 3.5795MHz
5V V+ CLK fCLK = –40
R12 0.1µF 16
8 17
SA 50/100
R41 –50
9 16 R44
LPA LPD
R31 10 15 R34 –60
BPA BPD
R21 11 14 R24 –70
HPA/NA HPD 0 1 2 3 4 5
R11 12 13
VIN INV A INV D INPUT FREQUENCY (kHz)
VOUT 1064 TA10
RESISTOR VALUES:
R11 = 88.7k R21 = 10k R31 = 35.7k R41 = 88.7k
R12 = 10k R22 = 44.8k R32 = 33.2k R42 = 24.9k
R13 = 15.8k R23 = 48.9k R33 = 63.5k R43 = 25.5k
R14 = 15.8k R24 = 44.8k R34 = 16.5k R44 = 24.9k 1064 TA09

1064fb

12
 LTC1064
U
TYPICAL APPLICATIO S
8th Order Chebyshev Lowpass Filter with a Passband
Ripple of 0.1dB and Cutoff Frequency up to 100kHz
R13

1 24 Amplitude Response
INV B INV C
R22 2 23 R23 15
HPB/NB HPC/NC
R32 3 22 R33 0
BPB BPC
R12 R42 4 21 R43
LPB LPC – 15
5 20 R14
SB SC –30

GAIN (dB)
6 – 19
AGND V –5V TO –8V 0.1µF –45
7 LTC1064 18
5V TO 8V V+ CLK fCLK = 5MHz
–60
0.1µF 8 17
SA 50/100 5V TO 8V
R41 9 16 R44 –75
LPA LPD VS = ±8V
R31 10 15 R34 –90 fCLK = 5MHz
BPA BPD PASSBAND RIPPLE = 0.1dB
R21 11 14 R24
HPA/NA HPD –105
R11 10k 100k 1M
12 13
VIN INV A INV D INPUT FREQUENCY (Hz)
VOUT
1064 TA12
RESISTOR VALUES:
R11 = 100.86k R21 = 16.75k R31 = 23.6k R41 = 99.73k 1064 TA11
R12 = 25.72k R22 = 20.93k R32 = 45.2k R42 = 25.52k
R13 = 16.61k R23 = 10.18k R33 = 68.15k R43 = 99.83k
R14 = 13.84k R24 = 11.52k R34 = 17.72k R44 = 25.42k
FOR fCLK > 3MHz, ADD C2 = 10pF ACROSS R42
C3 = 10pF ACROSS R43
C4 = 10pF ACROSS R44
WIDEBAND NOISE = 170µVRMS

1064fb

13
LTC1064
U
TYPICAL APPLICATIO S
8th Order Clock-Sweepable Lowpass Elliptic Antialiasing Filter
RH1

RL1

RH2

RL2
Amplitude Response
1 24 R11 0
INV B INV C VIN
R22 2 23 R21
HPB/NB HPC/NC –15
R32 3 22 R31
BPB BPC –30
R42 4 21 R41

VOUT/VIN (dB)
LPB LPC
5 20 –45
SB SC
6 19 –60
AGND V– –7.5V
7 LTC1064 18 0.1µF
7.5V V+ CLK fCLK ≤ 2MHz –75
0.1µF 8 17
SA 50/100 –7.5V
R43 9 16 R44 –90
LPA LPD
R33 10 15 R34
BPA BPD –105
R23 R24 0 10 20 30 40 50 60 70
11 14
HPA/NA HPD FREQUENCY (kHz)
12 13
INV A INV D 8TH ORDER CLOCK-SWEEPABLE LOWPASS
VOUT ELLIPTIC ANTIALIASING FILTER MAINTAINS,
RL3 FOR 0.1Hz ≤ fCUTOFF ≤ 20kHz, A ±0.1dB MAX
PASSBAND ERROR AND 72dB MIN STOPBAND
RH3 ATTENUATION AT 1.5 × fCUTOFF
RESISTOR VALUES: TOTAL WIDEBAND NOISE = 150µVRMS,
R11 = 19.1k R21 = 10k R31 = 13.7k R41 = 15.4k RL1 = 14k RH1 = 30.9k THD = 70dB (0.03%) FOR VIN = 3VRMS,
R22 = 10k R32 = 23.7k R42 = 10.2k RL2 = 26.7k RH2 = 76.8k fCLK /fCUTOFF = 100:1. THIS FILTER AVAILABLE
R23 = 11.3k R33 = 84.5k R43 = 10k RL3 = 10k RH3 = 60.2k AS LTC1064-1 WITH INTERNAL THIN FILM
R24 = 15.4k R34 = 15.2k R44 = 42.7k RESISTORS 1064 TA14

NOTE: FOR tCUTOFF >15kHz, ADD A 5pF CAPACITOR ACROSS R41 AND R43 1064 TA13

1064fb

14
 LTC1064
U
TYPICAL APPLICATIO S
Dual 4th Order Bessel Filter with 140kHz Cutoff Frequency
R13

R12
Amplitude Response
1 24
VIN1 INV B INV C 15
R22 2 23 R23
HPB/NB HPC/NC
R32 R33 0
3 22
BPB BPC
R42 4 21 R43 – 15
LPB LPC
5 20 –30
SB SC VOUT1

GAIN (dB)
6 – 19 –45
AGND V –8V
7 LTC1064 18 7MHz 0.1µF
8V V+ CLK –60
CLOCK
0.1µF 8 17
SA 50/100 8V
VOUT2 –75
9 16
LPA LPD
R41 R44 –90 VS = ±8V
10 15 fCLK = 7MHz
BPA BPD
R31 11 14 R34 –105
HPA/NA HPD 10k 100k 1M
R11 R21 12 13 R24
VIN2 INV A INV D INPUT FREQUENCY (Hz)
R14 1064 TA16

RESISTOR VALUES:
R11 = 14.3k R21 = 13k R31 = 7.5k R41 = 10k
R12 = 15.4k R22 = 15.4k R32 = 7.5k R42 = 10k
R13 = 3.92k R23 = 20k R33 = 27.4k R43 = 40k
R14 = 3.92k R24 = 20k R34 = 6.8k R44 = 10k
WIDEBAND NOISE = 64µVRMS 1064 TA15

fCLK 65
8th Order Linear Phase (Bessel) Filter with =
f –3dB 1

R12

R11 1 24 Amplitude Response

VIN1 INV B INV C
R21 2 23 R22 15
HPB/NB HPC/NC
R31 3 22 R32 0
BPB BPC
R41 4 21 R42
LPB LPC – 15
5 20
SB SC TO R13 –30
GAIN (dB)

6 19
AGND V– –5V TO –8V
–45
7 LTC1064 18 fCLK 0.1µF
5V TO 8V V+ CLK
≤7MHz –60
0.1µF 8 17
SA 50/100 TO V +
9 16 VOUT –75 VS = ±8V
LPA LPD fCLK = 4.5MHz
R43 10 15 R44 fCLK = 50% DUTY CYCLE
BPA BPD –90
f–3dB = 70kHz
R33 11 14 R34
HPA/NA HPD –105
FROM R13 R23 12 13 R24 10k 100k 1M
INV A INV D INPUT FREQUENCY (Hz)
PIN 20
R14
1064 TA18

RESISTOR VALUES:
R11 = 34.8k R21 = 34.8k R31 = 14.3k R41 = 40.2k
R12 = 10.5k R22 = 45.3k R32 = 22.1k R42 = 39.2k
R13 = 12.7k R23 = 34.8k R33 = 24.3k R43 = 20k
R14 = 20k R24 = 34.8k R34 = 13.3k R44 = 20k
WIDEBAND NOISE = 70µVRMS 1064 TA17

1064fb

15
LTC1064
U
TYPICAL APPLICATIO S
Dual 5th Order Chebyshev Lowpass Filter with
50kHz and 100kHz Cutoff Frequencies
R14
R13a R13b 1 24
VIN2 INV B INV C Amplitude Response
C2 R23 2 23 R24 15
1000pF HPB/NB HPC/NC
PASSBAND RIPPLE = 0.2dB
R33 3 22 R34
BPB BPC 4pF 0
R43 4 21 R44
LPB LPC – 15
5 20 VOUT2
SB SC fC = 100kHz
2pF –30

GAIN (dB)
6 19
AGND V– –8V
7 LTC1064 18 –45
5MHz 0.1µF
8V V+ CLK
T2L –60
22pF 8 17 VOUT1
0.1µF SA 50/100
R42 fC = 50kHz
9 16 –75
LPA LPD
R41 10 15 R32
BPA BPD 39pF –90
R31 11 14 R22
HPA/NA HPD –105
R11a R11b R21 12 13 10k 50k 100k 1M
VIN1 INV A INV D
INPUT FREQUENCY (Hz)
C1 R12
1000pF 1064 TA20

RESISTOR VALUES:
R11a = 4.32k R21 = 11.8k R31 = 29.4k R41 = 10k
R11b = 27.4k R22 = 20k R32 = 21.5k R42 = 31.6k
R12 = 10.5k R23 = 11.8k R33 = 29.4k R43 = 10k
R13a = 3k R24 = 20k R34 = 21.6k R44 = 31.6k
R13b = 29.4k
R14 = 10.5k 1064 TA19

1064fb

16
 LTC1064
U
PACKAGE DESCRIPTIO
J Package
24-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)

1.290
(32.77)
MAX

24 23 22 21 20 19 18 17 16 15 14 13

.220 – .310 .025

(5.588 – 7.874) (0.635)
RAD TYP

1 2 3 4 5 6 7 8 9 10 11 12

.005 .200
.300 BSC (0.127) (5.080)
(7.62 BSC) MIN MAX

.015 – .060
(0.381 – 1.524)

.008 – .018 0° – 15°

(0.203 – 0.457)

.125 .045 – .065

.100
(3.175) (1.143 – 1.651) (2.54)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE MIN BSC
.014 – .026
OR TIN PLATE LEADS
(0.360 – 0.660) J24 0801

OBSOLETE PACKAGE

1064fb

17
LTC1064
U
PACKAGE DESCRIPTIO
N Package
24-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)

1.265*
(32.131)
MAX
24 23 22 21 20 19 18 17 16 15 14 13

.255 ± .015*
(6.477 ± 0.381)

1 2 3 4 5 6 7 8 9 10 11 12

.300 – .325 .130 ± .005 .045 – .065

(7.620 – 8.255) (3.302 ± 0.127) (1.143 – 1.651)

.020
(0.508)
MIN .065
(1.651)
.008 – .015 TYP
(0.203 – 0.381) N24 1103
.120
+.035 .100 .018 ± .003
.325 –.015 (3.048)

( )
MIN (2.54) (0.457 ± 0.076)
+0.889 BSC
8.255
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)

1064fb

18
 LTC1064
U
PACKAGE DESCRIPTIO
SW Package
24-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)

.030 ±.005 .050 BSC .045 ±.005

TYP .598 – .614
(15.190 – 15.600)
N NOTE 4
24 23 22 21 20 19 18 17 16 15 14 13

N
.420 .325 ±.005
MIN

NOTE 3 .394 – .419

(10.007 – 10.643)

1 2 3 N/2
N/2

RECOMMENDED SOLDER PAD LAYOUT

.291 – .299 1 2 3 4 5 6 7 8 9 10 11 12
(7.391 – 7.595)
NOTE 4
.093 – .104 .037 – .045
.010 – .029 × 45° (0.940 – 1.143)
(2.362 – 2.642)
(0.254 – 0.737)
.005
(0.127)
RAD MIN 0° – 8° TYP

.050
(1.270) .004 – .012
.009 – .013
NOTE 3 BSC (0.102 – 0.305)
(0.229 – 0.330) .014 – .019
.016 – .050
(0.356 – 0.482)
(0.406 – 1.270)
NOTE: TYP
INCHES
1. DIMENSIONS IN S24 (WIDE) 0502
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

1064fb

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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 19
LTC1064
U
TYPICAL APPLICATIO S
Clock-Tunable, 30kHz to 90kHz 8th Order Notch Filter
Providing Notch Depth in Excess of 60dB
R13
C2
R14
1
INV B INV C
24 Amplitude Response
R22 2 23 R23 10
HPB/NB HPC/NC
R33 0
R32 3 22 BW
BPB BPC –10
R42 4 21
LPB LPC –20
0.1µF –30
5 20
SB SC

GAIN (dB)
–40
6 19
C1 AGND V– –8V –50
7 LTC1064 18
8V V+ CLK fCLK ≤ 5MHz –60
0.1µF 8 17 C3 –70
SA 50/100
R12 9 16 –80
LPA LPD
R31 R44 –90 VS = ±8V
10 15 C1 = C2 = C3 = 15pF
BPA BPD –100 fCLK = 4MHz
R21 11 14 R34 THE NOTCH DEPTH FROM
HPA/NA HPD 5kHz TO 30kHz IS 50dB –110
R11 R24 10 20 30 40 50 60 70
12 13 WIDEBAND NOISE = 300µVRMS
VIN1 INV A INV D INPUT FREQUENCY (kHz)
RL4
0.1% RG 1064 TA22

RH4
0.1%
RESISTOR VALUES:
–
R11 = 50k R21 = 5k R31 = 50k RG = 68.1k LT1056 VOUT
R12 = 15.4k R22 = 10k R32 = 88.7k R42 = 48.7k RL4 = 10k (0.1%)
R13 = 10k R23 = 10k R33 = 100k RH4 = 10k (0.1%) +
R14 = 9.09k R24 = 10k R34 = 63.4k R44 = 12.4k 1064 TA21

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PART NUMBER DESCRIPTION COMMENT
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LTC1068 Series Quad Universal Building Blocks fCLK:fO = 25:1, 50:1, 100:1 and 200:1
LTC1164 Low Power, Quad Universal Filter Building Block Low Noise, Low Power Pin-for-Pin LTC1064 Compatible
LTC1264 High Speed, Quad Universal Building Block Up to 250kHz Center Frequency

1064fb

LT/LT 0905 REV B • PRINTED IN USA

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