LM6161/LM6261/LM6361 High Speed Operational Amplifier
May 1999
LM6161/LM6261/LM6361
High Speed Operational Amplifier
General Description n High unity gain freq 50 MHz
n Low supply current 5 mA
The LM6161 family of high-speed amplifiers exhibits an ex-
n Fast settling 120 ns to 0.1%
cellent speed-power product in delivering 300 V/µs and
50 MHz unity gain stability with only 5 mA of supply current. n Low differential gain < 0.1%
Further power savings and application convenience are pos- n Low differential phase 0.1˚
sible by taking advantage of the wide dynamic range in oper- n Wide supply range 4.75V to 32V
ating supply voltage which extends all the way down to +5V. n Stable with unlimited capacitive load
These amplifiers are built with National’s VIP™ (Vertically In- n Well behaved; easy to apply
tegrated PNP) process which provides fast PNP transistors
that are true complements to the already fast NPN devices. Applications
This advanced junction-isolated process delivers high speed
n Video amplifier
performance without the need for complex and expensive di-
n High-frequency filter
electric isolation.
n Wide-bandwidth signal conditioning
n Radar
Features n Sonar
n High slew rate 300 V/µs
Connection Diagrams
10–Lead Flatpak
DS009057-13
See NS Package Number W10A
DS009057-5
See NS Package Number J08A,
N08E or M08A
Temperature Range Package NSC
Military Industrial Commercial Drawing
−55˚C ≤ TA ≤ +125˚C −25˚C ≤ TA ≤ +85˚C 0˚C ≤ TA ≤ +70˚C
LM6261N LM6361N 8-Pin N08E
Molded DIP
LM6161J/883 LM6361J 8-Pin J08A
5962-8962101PA Ceramic DIP
LM6261M LM6361M 8-Pin Molded M08A
Surface Mt.
LM6161WG/883 10-Lead WG10A
5962-8962101XA Ceramic SOIC
LM6161W/883 10-Pin W10A
5962-8962101HA Ceramic Flatpak
VIP™ is a trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS009057 www.national.com
Absolute Maximum Ratings (Note 12) See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
If Military/Aerospace specified devices are required, surface mount devices.
please contact the National Semiconductor Sales Office/
Storage Temp Range −65˚C to +150˚C
Distributors for availability and specifications.
Max Junction Temperature 150˚C
Supply Voltage (V+ − V−) 36V ESD Tolerance (Notes 6, 7) ± 700V
Differential Input Voltage
(Note 8) ± 8V Operating Ratings (Note 12)
Common-Mode Voltage Range
Temperature Range (Note 2)
(Note 10) (V+ − 0.7V) to (V− + 0.7V)
LM6161 −55˚C ≤ TJ ≤ +125˚C
Output Short Circuit to GND
LM6261 −25˚C ≤ TJ ≤ +85˚C
(Note 1) Continuous
LM6361 0˚C ≤ TJ ≤ +70˚C
Soldering Information
Dual-In-Line Package (N, J) Supply Voltage Range 4.75V to 32V
Soldering (10 sec.) 260˚C
Small Outline Package (M)
Vapor Phase (60 sec.) 215˚C
Infrared (15 sec.) 220˚C
DC Electrical Characteristics
The following specifications apply for Supply Voltage = ± 15V, VCM = 0, RL ≥ 100 kΩ and RS = 50Ω unless otherwise noted.
Boldface limits apply for TJ = TMIN to TMAX; all other limits TJ = 25˚C.
Symbol Parameter Conditions Typ LM6161 LM6261 LM6361 Units
Limit Limit Limit
(Notes 3, 11) (Note 3) (Note 3)
VOS Input Offset Voltage 5 7 7 20 mV
10 9 22 Max
VOS Input Offset Voltage 10 µV/˚C
Drift Average Drift
Ib Input Bias Current 2 3 3 5 µA
6 5 6 Max
IOS Input Offset Current 150 350 350 1500 nA
800 600 1900 Max
IOS Input Offset Current 0.4 nA/˚C
Drift Average Drift
RIN Input Resistance Differential 325 kΩ
CIN Input Capacitance AV = +1 @ 10 MHz 1.5 pF
AVOL Large Signal VOUT = ± 10V, 750 550 550 400 V/V
Voltage Gain RL = 2 kΩ (Note 9) 300 400 350 Min
RL = 10 kΩ (Note 9) 2900 V/V
VCM Input Common-Mode Supply = ± 15V +14.0 +13.9 +13.9 +13.8 Volts
Voltage Range +13.8 +13.8 +13.7 Min
−13.2 −12.9 −12.9 −12.8 Volts
−12.7 −12.7 −12.7 Min
Supply = +5V 4.0 3.9 3.9 3.8 Volts
(Note 4) 3.8 3.8 3.7 Min
1.8 2.0 2.0 2.1 Volts
2.2 2.2 2.2 Max
CMRR Common-Mode −10V ≤ VCM ≤ +10V 94 80 80 72 dB
Rejection Ratio 74 76 70 Min
PSRR Power Supply ± 10V ≤ V± ≤ ± 16V 90 80 80 72 dB
Rejection Ratio 74 76 70 Min
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DC Electrical Characteristics (Continued)
The following specifications apply for Supply Voltage = ± 15V, VCM = 0, RL ≥ 100 kΩ and RS = 50Ω unless otherwise noted.
Boldface limits apply for TJ = TMIN to TMAX; all other limits TJ = 25˚C.
Symbol Parameter Conditions Typ LM6161 LM6261 LM6361 Units
Limit Limit Limit
(Notes 3, 11) (Note 3) (Note 3)
VO Output Voltage Supply = ± 15V +14.2 +13.5 +13.5 +13.4 Volts
Swing and RL = 2 kΩ +13.3 +13.3 +13.3 Min
−13.4 −13.0 −13.0 −12.9 Volts
−12.7 −12.8 −12.8 Min
Supply = +5V 4.2 3.5 3.5 3.4 Volts
and RL = 2 kΩ 3.3 3.3 3.3 Min
(Note 4) 1.3 1.7 1.7 1.8 Volts
2.0 1.9 1.9 Max
Output Short Source 65 30 30 30 mA
Circuit Current 20 25 25 Min
Sink 65 30 30 30 mA
20 25 25 Min
IS Supply Current 5.0 6.5 6.5 6.8 mA
6.8 6.7 6.9 Max
AC Electrical Characteristics
The following specifications apply for Supply Voltage = ± 15V, VCM = 0, RL ≥ 100 kΩ and RS = 50Ω unless otherwise noted.
Boldface limits apply for TJ = TMIN to TMAX; all other limits TJ = 25˚C.
LM6161 LM6261 LM6361
Symbol Parameter Conditions Typ Limit Limit Limit Units
(Notes 3, 11) (Note 3) (Note 3)
GBW Gain-Bandwidth @ f = 20 MHz 50 40 40 35 MHz
Product 30 35 32 Min
Supply = ± 5V 35 MHz
SR Slew Rate AV = +1 (Note 8) 300 200 200 200 V/µs
180 180 180 Min
Supply = ± 5V (Note 8) 200 V/µs
PBW Power Bandwidth VOUT = 20 VPP 4.5 MHz
tS Settling Time 10V Step to 0.1% 120 ns
AV = −1, RL = 2 kΩ
φm Phase Margin 45 Deg
AD Differential Gain NTSC, AV = +4 < 0.1 %
φD Differential Phase NTSC, AV = +4 0.1 Deg
enp-p Input Noise Voltage f = 10 kHz 15
inp-p Input Noise Current f = 10 kHz 1.5
Note 1: Continuous short-circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150˚C.
Note 2: The typical junction-to-ambient thermal resistance of the molded plastic DIP (N) is 105˚C/W, the molded plastic SO (M) package is 155˚C/W, and the cerdip
(J) package is 125˚C/W. All numbers apply for packages soldered directly into a printed circuit board.
Note 3: Limits are guaranteed by testing or correlation.
Note 4: For single supply operation, the following conditions apply: V+ = 5V, V− = 0V, VCM = 2.5V, VOUT = 2.5V. Pin 1 & Pin 8 (Vos Adjust) are each connected to
Pin 4 (V−) to realize maximum output swing. This connection will degrade VOS, VOS Drift, and Input Voltage Noise.
Note 5: CL ≤ 5 pF.
Note 6: In order to achieve optimum AC performance, the input stage was designed without protective clamps. Exceeding the maximum differential input voltage re-
sults in reverse breakdown of the base-emitter junction of one of the input transistors and probable degradation of the input parameters (especially Vos, Ios, and
Noise).
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AC Electrical Characteristics (Continued)
Note 7: The average voltage that the weakest pin combinations (those involving Pin 2 or Pin 3) can withstand and still conform to the datasheet limits. The test circuit
used consists of the human body model of 100 pF in series with 1500Ω.
Note 8: VIN = 8V step. For supply = ± 5V, VIN = 5V step.
Note 9: Voltage Gain is the total output swing (20V) divided by the input signal required to produce that swing.
Note 10: The voltage between V+ and either input pin must not exceed 36V.
Note 11: A military RETS electrical test specification is available on request. At the time of printing, the RETS6161X specs complied with all Boldface limits in this
column.
Note 12: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The
guaranteed specifications apply only for the test conditions listed.
Typical Performance Characteristics (RL = 10 kΩ, TA = 25˚C unless otherwise specified)
Supply Current vs Common-Mode Power Supply
Supply Voltage Rejection Ratio Rejection Ratio
DS009057-15 DS009057-16 DS009057-17
Gain-Bandwidth Propagation Delay Gain-Bandwidth Product
Product Rise and Fall Times vs Load Capacitance
DS009057-18 DS009057-19 DS009057-20
Slew Rate vs Overshoot vs Slew Rate
Load Capacitance Capacitive Load
DS009057-23
DS009057-21
DS009057-22
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Typical Performance Characteristics (RL = 10 kΩ, TA = 25˚C unless otherwise
specified) (Continued)
Voltage Gain Gain vs Supply Voltage
vs Load Resistance
DS009057-25
DS009057-24
Differential Gain (Note 13) Differential Phase (Note 13)
DS009057-8
DS009057-7
Note 13: Differential gain and differential phase measured for four series LM6361 op amps configured as unity-gain followers, in series with an LM6321 buffer. Error
added by LM6321 is negligible. Test performed using Tektronix Type 520 NTSC test system.
Step Response; Av = +1
Input (2v/div) Output (2v/div)
(50 ns/div)
DS009057-1
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Typical Performance Characteristics (RL = 10 kΩ, TA = 25˚C unless otherwise
specified) (Continued)
Input Noise Voltage Input Noise Current Power Bandwidth
DS009057-26 DS009057-27 DS009057-28
Open-Loop Open-Loop Output Impedence
Frequency Response Frequency Response (Open-Loop)
DS009057-29
DS009057-30 DS009057-31
Common-Mode Input Output Saturation Voltage Bias Current vs
Saturation Voltage Common-Mode Voltage
DS009057-33
DS009057-32 DS009057-34
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Simplified Schematic
DS009057-3
Applications Tips
The LM6361 has been compensated for unity-gain opera- ever, improve the stability and transient response and is rec-
tion. Since this compensation involved adding emitter- ommended for every design. 0.01 µF to 0.1 µF ceramic ca-
degeneration resistors to the op amp’s input stage, the pacitors should be used (from each supply “rail” to ground);
open-loop gain was reduced as the stability increased. Gain if the device is far away from its power supply source, an ad-
error due to reduced AVOL is most apparent at high gains; ditional 2.2 µF to 10 µF of tantalum may provide extra noise
thus, for gains between 5 and 25, the less-compensated reduction.
LM6364 should be used, and the uncompensated LM6365 is Keep all leads short to reduce stray capacitance and lead in-
appropriate for gains of 25 or more. The LM6361, LM6364, ductance, and make sure ground paths are low-impedance,
and LM6365 have the same high slew rate, regardless of especially where heavier currents will be flowing. Stray ca-
their compensation. pacitance in the circuit layout can cause signal coupling
The LM6361 is unusually tolerant of capacitive loads. Most across adjacent nodes and can cause gain to unintentionally
op amps tend to oscillate when their load capacitance is vary with frequency.
greater than about 200 pF (especially in low-gain circuits). Breadboarded circuits will work best if they are built using
The LM6361’s compensation is effectively increased with generic PC boards with a good ground plane. If the op amps
load capacitance, reducing its bandwidth and increasing its are used with sockets, as opposed to being soldered into the
stability. circuit, the additional input capacitance may degrade circuit
Power supply bypassing is not as critical for the LM6361 as performance.
it is for other op amps in its speed class. Bypassing will, how-
Typical Applications
Offset Voltage Adjustment 1 MHz Low-Pass Filter
DS009057-4 DS009057-10
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Typical Applications (Continued)
Modulator with Differential-to-Single-Ended Converter
DS009057-11
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Physical Dimensions inches (millimeters) unless otherwise noted
Ceramic Dual-In-Line Package (J)
Order Number LM6161J/883
NS Package Number J08A
Molded Package SO (M)
Order Number LM6261M or LM6361M
NS Package Number M08A
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
Order Number LM6261N or LM6361N
NS Package Number N08E
10-Pin Ceramic Flatpak
Order Number LM6161W/883
NS Package Number W10A
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LM6161/LM6261/LM6361 High Speed Operational Amplifier
Notes
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whose failure to perform when properly used in the life support device or system, or to affect its
accordance with instructions for use provided in the safety or effectiveness.
labeling, can be reasonably expected to result in a
significant injury to the user.
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