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LM13700/LM13700A Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
November 1994
LM13700/LM13700A
Dual Operational Transconductance Amplifiers
with Linearizing Diodes and Buffers
General Description
The LM13700 series consists of two current controlled
transconductance amplifiers, each with differential inputs
and a push-pull output. The two amplifiers share common
supplies but otherwise operate independently. Linearizing
diodes are provided at the inputs to reduce distortion and
allow higher input levels. The result is a 10 dB signal-to-
noise improvement referenced to 0.5 percent THD. High im-
pedance buffers are provided which are especially designed
to complement the dynamic range of the amplifiers. The
output buffers of the LM13700 differ from those of the
LM13600 in that their input bias currents (and hence their
output DC levels) are independent of I ABC . This may result
in performance superior to that of the LM13600 in audio
applications.
Features
Y g m adjustable over 6 decades
Y Excellent g m linearity
Y Excellent matching between amplifiers
Y Linearizing diodes
Y High impedance buffers
Y High output signal-to-noise ratio
Applications
Y Current-controlled amplifiers
Y Current-controlled impedances
Y Current-controlled filters
Y Current-controlled oscillators
Y Multiplexers
Y Timers
Y Sample-and-hold circuits
Connection Diagram
Dual In-Line and Small Outline Packages
TL/H/7981±2
Top View
Order Number LM13700M, LM13700N or LM13700AN
See NS Package Number M16A or N16A
C 1995 National Semiconductor Corporation
TL/H/7981
RRD-B30M115/Printed in U. S. A.
337956827.003.png
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (Note 1)
LM13700
Operating Temperature Range
LM13700N, LM13700AN
0 § Cto a 70 § C
DC Input Voltage
a V S to b V S
Storage Temperature Range
b 65 § Cto a 150 § C
36 V DC or g 18V
Soldering Information
Dual-In-Line Package
Soldering (10 sec.)
LM13700A
44 V DC or g 22V
Power Dissipation (Note 2) T A e 25 § C
LM13700N, LM13700AN
260 § C
570 mW
Small Outline Package
Vapor Phase (60 sec.) 215 § C
Infrared (15 sec.) 220 § C
See AN-450 ``Surface Mounting Methods and Their Effect
on Product Reliability'' for other methods of soldering sur-
face mount devices.
Differential Input Voltage
g 5V
Diode Bias Current (I D )
2 mA
Amplifier Bias Current (I ABC )
2 mA
Output Short Circuit Duration
Continuous
Buffer Output Current (Note 3)
20 mA
Electrical Characteristics (Note 4)
LM13700
LM13700A
Parameter
Conditions
Units
Min Typ Max Min Typ Max
Input Offset Voltage (V OS )
0.4
4
0.4
1
Over Specified Temperature Range
2 mV
I ABC e 5 m A
0.3
4
0.3
1
V OS Including Diodes
Diode Bias Current (I D ) e 500 m A
0.5
5
0.5
2 mV
Input Offset Change
5 m A s I ABC s 500 m A
0.1
3
0.1
1 mV
Input Offset Current
0.1
0.6
0.1
0.6 m A
Input Bias Current
Over Specified Temperature Range
0.4
5
0.4
5
m A
1
8
1
7
Forward
6700 9600 13000 7700 9600 12000
m mho
Transconductance (g m )
Over Specified Temperature Range 5400
4000
g m Tracking
0.3
0.3
dB
Peak Output Current
R L e 0, I ABC e 5 m A 5 3 5 7
R L e 0, I ABC e 500 m A 350 500 650 350 500 650 m A
R L e 0, Over Specified Temp Range 300
300
Peak Output Voltage
Positive
R L e % ,5 m A s I ABC s 500 m A a 12 a 14.2
a 12 a 14.2
V
Negative
R L e % ,5 m A s I ABC s 500 m A b 12 b 14.4
b 12 b 14.4
V
Supply Current
I ABC e 500 m A, Both Channels
2.6
2.6
mA
V OS Sensitivity
Positive
D V OS / D V a
20
150
20
150 m V/V
Negative
D V OS / D V b
20
150
20
150 m V/V
CMRR
80 110
80 110
dB
Common Mode Range
g 12 g 13.5
g 12 g 13.5
V
Crosstalk
Referred to Input (Note 5)
100
100
dB
20 Hz k f k 20 kHz
Differential Input Current
I ABC e 0, Input e g 4V
0.02 100
0.02
10
nA
Leakage Current
I ABC e 0 (Refer to Test Circuit)
0.2
100
0.2
5
nA
Input Resistance
10
26
10
26
k X
2
337956827.004.png
Electrical Characteristics (Note 4) (Continued)
LM13700
LM13700A
Parameter
Conditions
Units
Min Typ Max Min Typ Max
Open Loop Bandwidth
2
2
MHz
Slew Rate
Unity Gain Compensated
50
50
V/ m s
Buffer Input Current
(Note 5)
0.5
2
0.5
2
m A
Peak Buffer Output Voltage (Note 5)
10
10
V
Note 1: For selections to a supply voltage above g 22V, contact factory.
Note 2: For operation at ambient temperatures above 25 § C, the device must be derated based on a 150 § C maximum junction temperature and a thermal
resistance, junction to ambient, as follows: LM13700N, 90 § C/W; LM13700M, 110 § C/W.
Note 3: Buffer output current should be limited so as to not exceed package dissipation.
Note 4: These specifications apply for V S e g 15V, T A e 25 § C, amplifier bias current (I ABC ) e 500 m A, pins 2 and 15 open unless otherwise specified. The inputs
to the buffers are grounded and outputs are open.
Note 5: These specifications apply for V S e g 15V, I ABC e 500 m A, R OUT e 5k X connected from the buffer output to b V S and the input of the buffer is
connected to the transconductance amplifier output.
Schematic Diagram
One Operational Transconductance Amplifier
TL/H/7981±1
3
337956827.005.png
Typical Performance Characteristics
Input Offset Voltage
Input Offset Current
Input Bias Current
Peak Output Voltage and
Peak Output Current
Common Mode Range
Leakage Current
Input Leakage
Transconductance
Input Resistance
Amplifier Bias Voltage vs
Amplifier Bias Current
Input and Output Capacitance
Output Resistance
TL/H/7981±3
4
337956827.006.png
 
Typical Performance Characteristics (Continued)
Distortion vs Differential
Voltage vs Amplifier
Input Voltage
Bias Current
Output Noise vs Frequency
TL/H/7981±4
Unity Gain Follower
TL/H/7981±5
Leakage Current Test Circuit
Differential Input Current Test Circuit
TL/H/7981±6
TL/H/7981±7
5
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