1997 Burr-Brown Corporation
PDS-1391B
Printed in U.S.A. July, 1997
DESCRIPTION
The INA137 and INA2137 are differential line receivers
consisting of high performance op amps with on-chip
precision resistors. They are fully specified for high
performance audio applications and have excellent ac
specifications, including low distortion (0.0005% at
1kHz) and high slew rate (14V/
s), assuring good
dynamic response. In addition, wide output voltage
swing and high output drive capability allow use in a
wide variety of demanding applications. The dual ver-
sion features completely independent circuitry for low-
est crosstalk and freedom from interaction, even when
overdriven or overloaded.
The INA137 and INA2137 on-chip resistors are laser
trimmed for accurate gain and optimum
common-mode rejection. Furthermore, excellent TCR
tracking of the resistors maintains gain accuracy and
common-mode rejection over temperature. Operation
is guaranteed from
4V to
18V (8V to 36V total
supply).
The INA137 is available in 8-pin DIP and SO-8
surface-mount packages. The INA2137 comes in
14-pin DIP and SO-14 surface-mount packages. Both
are specified for operation over the extended industrial
temperature range, 40
C to +85
C.
FEATURES
q
SINGLE AND DUAL VERSIONS
q
LOW DISTORTION: 0.0005% at f = 1kHz
q
HIGH SLEW RATE: 14V/
s
q
FAST SETTLING TIME: 3
s to 0.01%
q
WIDE SUPPLY RANGE:
4V to
18V
q
LOW QUIESCENT CURRENT: 2.9mA max
q
HIGH CMRR: 90dB
q
FIXED GAIN =
6dB
q
PACKAGES--SINGLE: 8-PIN DIP, SO-8
DUAL: 14-PIN DIP, SO-14
APPLICATIONS
q
AUDIO DIFFERENTIAL LINE RECEIVER
q
G = 1/2 OR G = 2 AMPLIFIER
q
INSTRUMENTATION BUILDING BLOCK
q
CURRENT SHUNT MONITOR
q
VOLTAGE-CONTROLLED CURRENT
SOURCE
q
GROUND LOOP ELIMINATOR
INA137
INA2137
AUDIO DIFFERENTIAL LINE RECEIVERS
6dB (G = 1/2 or 2)
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
INA137
INA137
INA2137
INA2137
Sense A
INA2137
Out A
V+
Ref A
In A
+In A
12
13
14
2
11
V
4
3
12k
6k
12k
6k
12k
6k
12k
6k
B
A
Sense B
Out B
Ref B
In B
+In B
10
9
8
6
5
Sense
INA137
Output
V+
Ref
In
+In
5
6
1
2
7
V
4
3
12k
6k
6k
12k
2
INA137, INA2137
SPECIFICATIONS: V
S
=
18V
At T
A
= +25
C, V
S
=
18V, R
L
= 2k
, G = 1/2, and Ref Pin connected to Ground, unless otherwise noted.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
INA137PA, UA
INA2137PA, UA
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
AUDIO PERFORMANCE
Total Harmonic Distortion + Noise, f = 1kHz
V
IN
= 10Vrms
0.0005
%
Noise Floor, RTO
(1)
20kHz BW
106
dBu
Headroom, RTO
(1)
THD+N < 1%
+23
dBu
FREQUENCY RESPONSE
Small-Signal Bandwidth
4.0
MHz
Slew Rate
14
V/
s
Settling Time: 0.1%
10V Step, C
L
= 100pF
2
s
0.01%
10V Step, C
L
= 100pF
3
s
Overload Recovery Time
50% Overdrive
3
s
Channel Separation (dual), f = 1kHz
123
dB
OUTPUT NOISE VOLTAGE
(2)
f = 20Hz to 20kHz
3.5
Vrms
f = 1kHz
26
nV/
HZ
OFFSET VOLTAGE
(3)
RTO
Input Offset Voltage
V
CM
= 0V
100
1000
V
vs Temperature
Specified Temperature Range
2
V/
C
vs Power Supply
V
S
=
4V to
18V
5
60
V/V
INPUT
Common-Mode Voltage Range: Positive
V
O
= 0V
3(V+)7.5
3(V+)6
V
Negative
V
O
= 0V
3(V)+7.5
3(V)+3
V
Differential Voltage Range
See Typical Curve
Common-Mode Rejection
V
CM
=
46.5V, R
S
= 0
74
90
dB
Impedance
(4)
Differential
24
k
Common-Mode
18
k
GAIN
Initial
0.5
V/V
Error
V
O
= 10V to 10V
0.01
0.1
%
vs Temperature
1
10
ppm/
C
Nonlinearity
V
O
= 10V to 10V
0.0001
%
OUTPUT
Voltage Output, Positive
(V+)2
(V+)1.8
V
Negative
(V)+2
(V)+1.6
V
Current Limit, Continuous to Common
60
mA
Capacitive Load (Stable Operation)
500
pF
POWER SUPPLY
Rated Voltage
18
V
Voltage Range
4
18
V
Quiescent Current (per Amplifier)
I
O
= 0
2.4
2.9
mA
TEMPERATURE RANGE
Specification Range
40
85
C
Operation Range
55
125
C
Storage Range
55
125
C
Thermal Resistance,
JA
8-Pin DIP
100
C/W
SO-8 Surface-Mount
150
C/W
14-Pin DIP
80
C/W
SO-14 Surface-Mount
100
C/W
RTO = Referred to Output.
NOTES: (1) dBu = 20log (Vrms /0.7746). (2) Includes effects of amplifier's input current noise and thermal noise contribution of resistor network.
(3) Includes effects of amplifier's input bias and offset currents. (4) Internal resistors are ratio matched but have
25% absolute value.
3
INA137, INA2137
PIN CONFIGURATIONS
Top View
8-Pin DIP/SO-8
Top View
14-Pin DIP/SO-14
Ref
In
+In
V
NC
V+
Output
Sense
NC = No Connection
1
2
3
4
8
7
6
5
Supply Voltage, V+ to V .................................................................... 40V
Input Voltage Range ..........................................................................
80V
Output Short-Circuit (to ground)
(2) ............................................................
Continuous
Operating Temperature ................................................. 55
C to +125
C
Storage Temperature ..................................................... 55
C to +125
C
Junction Temperature .................................................................... +150
C
Lead Temperature (soldering, 10s) ............................................... +300
C
NOTE: (1) Stresses above these ratings may cause permanent damage.
(2) One channel per package.
ABSOLUTE MAXIMUM RATINGS
(1)
PACKAGE/ORDERING INFORMATION
PACKAGE
SPECIFICATION
DRAWING
TEMPERATURE
PRODUCT
PACKAGE
NUMBER
(1)
RANGE
Single
INA137PA
8-Pin DIP
006
40
C to +85
C
INA137UA
SO-8 Surface-Mount
182
40
C to +85
C
Dual
INA2137PA
14-Pin DIP
010
40
C to +85
C
INA2137UA
SO-14 Surface-Mount
235
40
C to +85
C
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with ap-
propriate precautions. Failure to observe proper handling and
installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
NC
In A
+In A
V
+In B
In B
NC
Ref A
Out A
Sense A
V+
Sense B
Out B
Ref B
NC = No Connection
1
2
3
4
5
6
7
14
13
12
11
10
9
8
A
B
4
INA137, INA2137
TYPICAL PERFORMANCE CURVES
At T
A
= +25
C, V
S
=
18V, and G = 1/2, unless otherwise noted.
OUTPUT VOLTAGE NOISE SPECTRAL DENSITY
vs FREQUENCY
Frequency (Hz)
Voltage Noise (nV/
Hz)
1
10
100
1k
10k
100k
1M
10k
1k
100
10
OUTPUT NOISE VOLTAGE
vs NOISE BANDWIDTH
Frequency (Hz)
Noise Voltage (Vrms)
1
10
100
1k
10k
100k
100
10
1
0.1
DIM INTERMODULATION DISTORTION
vs OUTPUT AMPLITUDE
Output Amplitude (dBu)
DIM (%)
10
5
0
5
10
15
20
25
5
1
0.1
0.010
0.001
R
L
= 2k
, 600
BW = 100kHz
RTO
HEADROOM - TOTAL HARMONIC DISTORTION+NOISE
vs OUTPUT AMPLITUDE
Output Amplitude (dBu)
THD+Noise (%)
0
5
10
15
20
25
30
1
0.1
0.010
0.001
0.0001
f = 1kHz
RTO
R
L
= 600
R
L
= 2k
,
100k
HARMONIC DISTORTION PRODUCTS
vs FREQUENCY
Frequency (Hz)
Amplitude (% of Fundamental)
20
100
1k
10k
20k
0.001
0.0001
0.00001
0.000001
V
O
= 1Vrms
( Noise Limited)
3rd Harmonic
2nd Harmonic
R
L
= 600
R
L
= 2k
R
L
= 2k
R
L
= 600
TOTAL HARMONIC DISTORTION+NOISE
vs FREQUENCY
Frequency (Hz)
THD+Noise (%)
20
100
1k
10k
20k
0.1
0.010
0.001
0.0001
V
O
= 5Vrms
R
L
= 600
R
L
= 100k
R
L
= 2k
5
INA137, INA2137
TYPICAL PERFORMANCE CURVES
(CONT)
At T
A
= +25
C, V
S
=
18V, and G = 1/2, unless otherwise noted.
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
Frequency (Hz)
Output Voltage (Vp-p)
100
1k
10k
100k
1M
10M
40
30
20
10
0
COMMON-MODE REJECTION vs FREQUENCY
Frequency (Hz)
Common-Mode Rejection (dB)
1k
10k
100k
1M
100
80
60
40
RTO
POWER SUPPLY REJECTION vs FREQUENCY
Frequency (Hz)
Power Supply Rejection (dB)
100
1k
10k
100k
1M
120
100
80
60
40
20
0
PSR
RTO
+PSR
INPUT COMMON-MODE VOLTAGE
vs OUTPUT VOLTAGE
Output Voltage (V)
Common-Mode Voltage (V)
20
15
10
5
0
5
10
15
20
80
60
40
20
0
20
40
60
80
V
REF
= 0V
R
L
= 2k
G = 1/2
V
S
= 18V
GAIN vs FREQUENCY
Frequency (Hz)
Voltage Gain (dB)
1k
10k
100k
1M
10M
10
0
10
20
30
CHANNEL SEPARATION vs FREQUENCY
Frequency (Hz)
Channel Separation (dB)
20
100
1k
10k
20k
130
120
110
100
90
R
L
= 100k
R
L
= 2k
Dual Devices
6
INA137, INA2137
TYPICAL PERFORMANCE CURVES
(CONT)
At T
A
= +25
C, V
S
=
18V, and G = 1/2, unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
Temperature (C)
Quiescent Current (mA)
75
50
25
0
25
50
75
100
125
4
3
2
1
0
SLEW RATE vs TEMPERATURE
Temperature (C)
Slew Rate (V/s)
75
50
25
0
25
50
75
100
+SR
125
16
14
12
10
8
SR
SHORT-CIRCUIT CURRENT vs TEMPERATURE
Temperature (C)
Short-Circuit Current (mA)
75
50
25
0
25
50
75
100
125
80
60
40
20
0
20
40
60
80
+I
SC
I
SC
QUIESCENT CURRENT vs SUPPLY VOLTAGE
Supply Voltage (V)
Quiescent Current (mA)
4
6
8
10
12
14
16
18
3
2
1
0
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage (V)
1000
900
800
700
600
500
400
300
200
100
0
100
200
300
400
500
600
700
800
900
1000
35
30
25
20
15
10
5
0
Typical Production
Distribution of
Packaged Units.
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage Drift (V/C)
30
25
20
15
10
5
0
Typical Production Distribution
of Packaged Units.
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
7
INA137, INA2137
TYPICAL PERFORMANCE CURVES
(CONT)
At T
A
= +25
C, V
S
=
18V, and G = 1/2, unless otherwise noted.
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
17
16
15
14
13
12
12
13
14
15
16
17
0
20
40
60
80
Output Current (mA)
Output Voltage Swing (V)
55C
55C
25C
85C
85C
125C
125C
25C
SMALL-SIGNAL OVERSHOOT
vs LOAD CAPACITANCE
Load Capacitance (pF)
Overshoot (%)
0
200
400
600
800
1000
1200
70
60
50
40
30
20
10
0
R
L
= 2k
100mV Step
SMALL-SIGNAL STEP RESPONSE
50mV/div
5V/div
LARGE-SIGNAL STEP RESPONSE
C
L
= 100pF
C
L
= 100pF
1
s/div
1
s/div
C
L
= 500pF
8
INA137, INA2137
The INA137 and INA2137 have excellent distortion charac-
teristics. THD+Noise is below 0.001% throughout the audio
frequency range. Up to approximately 10kHz distortion is
below the measurement limit of commonly used test equip-
ment. Furthermore, distortion remains relatively flat over its
wide output voltage swing range (approximately 1.7V from
either supply).
OFFSET VOLTAGE TRIM
The INA137 and INA2137 are laser trimmed for low offset
voltage and drift. Most applications require no external offset
adjustment. Figure 3 shows an optional circuit for trimming
the output offset voltage. The output is referred to the output
reference terminal (pin 1), which is normally grounded. A
voltage applied to the Ref terminal will be summed with the
output signal. This can be used to null offset voltage as
shown in Figure 3. The source impedance of a signal applied
to the Ref terminal should be less than 10
to maintain good
common-mode rejection.
APPLICATIONS INFORMATION
The INA137 and INA2137 are differential line receivers
suitable for a wide range of audio and general-purpose
applications. Figure 1 shows the basic G = 1/2 (6dB)
differential receiver configuration. The input and feedback
resistors can be reversed to achieve G = 2 (+6dB), as shown
in Figure 2. For applications requiring G = 1 (0dB), the
INA134 and INA2134 are recommended.
Decoupling capacitors are strongly recommended for appli-
cations with noisy or high impedance power supplies. The
capacitors should be placed close to the device pins as
shown in Figure 1. All circuitry is completely independent
in the dual version assuring lowest crosstalk and normal
behavior when one amplifier is overdriven or short-cir-
cuited.
As shown in Figure 1, the differential input signal is con-
nected to pins 2 and 3. The source impedances connected to
the inputs must be nearly equal to assure good common-
mode rejection. A 5
mismatch in source impedance will
degrade the common-mode rejection of a typical device to
approximately 77dB (RTO). If the source has a known
impedance mismatch, an additional resistor in series with
the opposite input can be used to preserve good common-
mode rejection.
FIGURE 3. Offset Adjustment.
AUDIO PERFORMANCE
The INA137 and INA2137 were designed for enhanced ac
performance. Very low distortion, low noise, and wide band-
width provide superior performance in high quality audio
applications. Laser-trimmed matched resistors provide opti-
mum common-mode rejection (typically 90dB), especially
when compared to circuits implemented with an op amp
and discrete precision resistors. In addition, high slew rate
(14V/
s) and fast settling time (3
s to 0.01%) ensure excel-
lent dynamic performance.
V
3
5
6
1
3
INA137
V
O
= 1/2 (V
3
V
2
)
2
R
3
R
4
R
1
R
2
12k
6k
12k
6k
V
2
In
+In
1F
V
4
1F
V+
7
FIGURE 1. G = 1/2 Differential Receiver (Basic Power
Supply and Signal Connections).
V
3
2
6
3
1
INA137
V
O
= 2 (V
3
V
2
)
5
R
4
R
3
R
2
R
1
6k
12k
6k
12k
V
2
In
+In
FIGURE 2. G = 2 Differential Receiver.
V
3
5
6
3
V
O
INA137
V
O
= 1/2 (V
3
V
2
)
Offset Adjustment
Range = 1mV
G = 1/2
2
R
4
6k
V
2
20
250k
10
100k
+15V
15V
1
R
3
12k
R
1
12k
R
2
6k
9
INA137, INA2137
FIGURE 4. Precision Summing Amplifier.
FIGURE 5. Boosting Output Current.
FIGURE 6. High Input Impedance Instrumentation Amplifier.
The difference amplifier is a highly versatile building
block that is useful in a wide variety of applications. See
the INA105 data sheet for additional applications ideas,
including:
Current Receiver with Compliance to Rails
10V Precision Voltage Reference
5V Precision Voltage Reference
Precision Average Value Amplifier
Precision Bipolar Offsetting
Precision Summing Amplifier with Gain
Instrumentation Amplifier Guard Drive Generator
Precision Summing Instrumentation Amplifier
Precision Absolute Value Buffer
Precision Voltage-to-Current Converter with Differential
Inputs
Differential Input Voltage-to-Current Converter for Low
I
OUT
Isolating Current Source
Differential Output Difference Amplifier
Isolating Current Source with Buffering Amplifier for
Greater Accuracy
Window Comparator with Window Span and Window
Center Inputs
Precision Voltage-Controlled Current Source with Buff-
ered Differential Inputs and Gain
BUF634
+In
In
5
6
1
6
3
3
V
O
INA137
12k
6k
12k
6k
2
5
6
3
INA137
2
1
V
0
0utput
V
1
1/2
OPA2134
1/2
OPA2134
R
2
6k
G = 2
12k
6k
12k
R
2
R
1
In
V
2
+In
V
O
= 2 (1 + 2R
2
/R
1
) (V
2
V
1
)
V
1
V
2
5
6
1
3
V
0
= 2V
1
+ V
2
INA137
2
6k
6k
12k
12k
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