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LM6161/LM6261/LM6361
High Speed Operational Amplifier
General Description
The LM6161 family of high-speed amplifiers exhibits an excellent speed-power product in delivering 300 V/µs and
50 MHz unity gain stability with only 5 mA of supply current.
Further power savings and application convenience are possible by taking advantage of the wide dynamic range in operating supply voltage which extends all the way down to +5V.
These amplifiers are built with National’s VIP
™
(VerticallyIntegrated PNP) process which provides fast PNP transistors
that are true complements to the already fast NPN devices.
This advanced junction-isolated process delivers high speed
performance without the need for complex and expensive dielectric isolation.
Features
n High slew rate 300 V/µs
n High unity gain freq 50 MHz
n Low supply current 5 mA
n Fast settling 120 ns to 0.1
%
n Low differential gain
<
0.1
%
n Low differential phase 0.1˚
n Wide supply range 4.75V to 32V
n Stable with unlimited capacitive load
n Well behaved; easy to apply
Applications
n Video amplifier
n High-frequency filter
n Wide-bandwidth signal conditioning
n Radar
n Sonar
Connection Diagrams
Temperature Range Package NSC
Drawing
Military Industrial Commercial
−55˚C ≤ T
A
≤ +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.
10–Lead Flatpak
DS009057-13
See NS Package Number W10A
DS009057-5
See NS Package Number J08A,
N08E or M08A
May 1999
LM6161/LM6261/LM6361 High Speed Operational Amplifier
© 1999 National Semiconductor Corporation DS009057 www.national.com
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Absolute Maximum Ratings (Note 12)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
+−V−
) 36V
Differential Input Voltage
(Note 8)
±
8V
Common-Mode Voltage Range
(Note 10) (V
+
− 0.7V) to (V−+ 0.7V)
Output Short Circuit to GND
(Note 1) Continuous
Soldering Information
Dual-In-Line Package (N, J)
Soldering (10 sec.) 260˚C
Small Outline Package (M)
Vapor Phase (60 sec.)
Infrared (15 sec.)
215˚C
220˚C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
Storage Temp Range −65˚C to +150˚C
Max Junction Temperature 150˚C
ESD Tolerance (Notes 6, 7)
±
700V
Operating Ratings (Note 12)
Temperature Range (Note 2)
LM6161 −55˚C ≤ T
J
≤ +125˚C
LM6261 −25˚C ≤ T
J
≤ +85˚C
LM6361 0˚C ≤ T
J
≤ +70˚C
Supply Voltage Range 4.75V to 32V
DC Electrical Characteristics
The following specifications apply for Supply Voltage
=
±
15V, V
CM
=
0, R
L
≥ 100 kΩ and R
S
=
50Ω unless otherwise noted.
Boldface limits apply for T
J
=
T
MIN
to T
MAX
; all other limits T
J
=
25˚C.
Symbol Parameter Conditions Typ LM6161 LM6261 LM6361 Units
Limit Limit Limit
(Notes 3, 11) (Note 3) (Note 3)
V
OS
Input Offset Voltage 5 7 7 20 mV
10 9 22 Max
V
OS
Input Offset Voltage 10 µV/˚C
Drift Average Drift
I
b
Input Bias Current 2 3 3 5 µA
656Max
I
OS
Input Offset Current 150 350 350 1500 nA
800 600 1900 Max
I
OS
Input Offset Current 0.4 nA/˚C
Drift Average Drift
R
IN
Input Resistance Differential 325 kΩ
C
IN
Input Capacitance A
V
=
+1
@
10 MHz 1.5 pF
A
VOL
Large Signal V
OUT
=
±
10V, 750 550 550 400 V/V
Voltage Gain R
L
=
2kΩ(Note 9) 300 400 350 Min
R
L
=
10 kΩ (Note 9) 2900 V/V
V
CM
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 ≤ V
CM
≤ +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, V
CM
=
0, R
L
≥ 100 kΩ and R
S
=
50Ω unless otherwise noted.
Boldface limits apply for T
J
=
T
MIN
to T
MAX
; all other limits T
J
=
25˚C.
Symbol Parameter Conditions Typ LM6161 LM6261 LM6361 Units
Limit Limit Limit
(Notes 3, 11) (Note 3) (Note 3)
V
O
Output Voltage Supply
=
±
15V +14.2 +13.5 +13.5 +13.4 Volts
Swing and R
L
=
2kΩ +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 R
L
=
2kΩ 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
I
S
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, V
CM
=
0, R
L
≥ 100 kΩ and R
S
=
50Ω unless otherwise noted.
Boldface limits apply for T
J
=
T
MIN
to T
MAX
; all other limits T
J
=
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 A
V
=
+1 (Note 8) 300 200 200 200 V/µs
180 180 180 Min
Supply
=
±
5V (Note 8) 200 V/µs
PBW Power Bandwidth V
OUT
=
20 V
PP
4.5 MHz
t
S
Settling Time 10V Step to 0.1
%
120 ns
A
V
=
−1, R
L
=
2kΩ
φm Phase Margin 45 Deg
A
D
Differential Gain NTSC, A
V
=
+4
<
0.1
%
φD Differential Phase NTSC, A
V
=
+4 0.1 Deg
e
np-p
Input Noise Voltage f=10 kHz 15
i
np-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)packageis155˚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,V
CM
=
2.5V,V
OUT
=
2.5V.Pin 1 & Pin 8 (Vos Adjust) are each connected to
Pin4(V
−
) to realize maximum output swing. This connection will degrade VOS,VOSDrift, and Input Voltage Noise.
Note 5: C
L
≤ 5pF.
Note 6: In order to achieve optimum AC performance, theinputstagewasdesigned without protective clamps. Exceeding the maximum differential input voltage results 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: V
IN
=
8V step. For supply
=
±
5V, V
IN
=
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 (R
L
=10kΩ,TA= 25˚C unless otherwise specified)
Supply Current vs
Supply Voltage
DS009057-15
Common-Mode
Rejection Ratio
DS009057-16
Power Supply
Rejection Ratio
DS009057-17
Gain-Bandwidth
Product
DS009057-18
Propagation Delay
Rise and Fall Times
DS009057-19
Gain-Bandwidth Product
vs Load Capacitance
DS009057-20
Slew Rate vs
Load Capacitance
DS009057-21
Overshoot vs
Capacitive Load
DS009057-22
Slew Rate
DS009057-23
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Typical Performance Characteristics (R
L
=10kΩ,TA= 25˚C unless otherwise
specified) (Continued)
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.
Voltage Gain
vs Load Resistance
DS009057-24
Gain vs Supply Voltage
DS009057-25
Differential Gain (Note 13)
DS009057-7
Differential Phase (Note 13)
DS009057-8
Step Response; Av=+1
(50 ns/div)
Input (2v/div) Output (2v/div)
DS009057-1
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Typical Performance Characteristics (R
L
=10kΩ,TA= 25˚C unless otherwise
specified) (Continued)
Input Noise Voltage
DS009057-26
Input Noise Current
DS009057-27
Power Bandwidth
DS009057-28
Open-Loop
Frequency Response
DS009057-29
Open-Loop
Frequency Response
DS009057-30
Output Impedence
(Open-Loop)
DS009057-31
Common-Mode Input
Saturation Voltage
DS009057-32
Output Saturation Voltage
DS009057-33
Bias Current vs
Common-Mode Voltage
DS009057-34
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Simplified Schematic
Applications Tips
The LM6361 has been compensated for unity-gain operation. Since this compensation involved adding emitterdegeneration resistors to the op amp’s input stage, the
open-loop gain was reduced as the stability increased. Gain
error due to reduced A
VOL
is most apparent at high gains;
thus, for gains between 5 and 25, the less-compensated
LM6364 should be used, and the uncompensated LM6365 is
appropriate for gains of 25 or more. The LM6361, LM6364,
and LM6365 have the same high slew rate, regardless of
their compensation.
The LM6361 is unusually tolerant of capacitive loads. Most
op amps tend to oscillate when their load capacitance is
greater than about 200 pF (especially in low-gain circuits).
The LM6361’s compensation is effectively increased with
load capacitance, reducing its bandwidth and increasing its
stability.
Power supply bypassing is not as critical for the LM6361 as
it is for other op amps in its speed class. Bypassing will, how-
ever, improve the stability and transient response and is recommended for every design. 0.01 µF to 0.1 µF ceramic capacitors should be used (from each supply “rail” to ground);
if the device is far away from its power supply source, an additional 2.2 µF to 10 µF of tantalum may provide extra noise
reduction.
Keep all leads short to reduce stray capacitance and lead inductance, and make sure ground paths are low-impedance,
especially where heavier currents will be flowing. Stray capacitance in the circuit layout can cause signal coupling
across adjacent nodes and can cause gain to unintentionally
vary with frequency.
Breadboarded circuits will work best if they are built using
generic PC boards with a good ground plane. If the op amps
are used with sockets, as opposed to being soldered into the
circuit, the additional input capacitance may degrade circuit
performance.
Typical Applications
DS009057-3
Offset Voltage Adjustment
DS009057-4
1 MHz Low-Pass Filter
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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Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
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Fax: +49 (0) 1 80-530 85 86
Email: europe.support@nsc.com
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Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
www.national.com
LM6161/LM6261/LM6361 High Speed Operational Amplifier
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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