Low Power, Single-Supply
DIFFERENCE AMPLIFIER
1996 Burr-Brown Corporation
PDS-1353A
Printed in U.S.A. November, 1996
FEATURES
q
LOW QUIESCENT CURRENT: 160
A
q
WIDE SUPPLY RANGE
Single Supply: 2.7V to 36V
Dual Supplies:
1.35V to
18V
q
LOW GAIN ERROR:
0.075% max
q
LOW NONLINEARITY: 0.001% max
q
HIGH CMR: 90dB
q
HIGHLY VERSATILE CIRCUIT
q
EASY TO USE
q
LOW COST
q
8-PIN DIP AND SO-8 PACKAGES
INA132
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
DESCRIPTION
The INA132 is a low power, unity-gain differential
amplifier consisting of a precision op amp with a
precision resistor network. The on-chip resistors are
laser trimmed for accurate gain and high common-
mode rejection. Excellent TCR tracking of the resis-
tors maintains gain accuracy and common-mode re-
jection over temperature. The internal op amp's com-
mon-mode range extends to the negative supply--
ideal for single-supply applications. It operates on
single (2.7V to 36V) or dual supplies (
1.35V to
18V).
The differential amplifier is the foundation of many
commonly used circuits. The INA132 provides this
circuit function without using an expensive precision
resistor network. The INA132 is available in 8-pin
DIP and SO-8 surface-mount packages and is speci-
fied for operation over the extended industrial tem-
perature range, 40
C to +85
C.
APPLICATIONS
q
DIFFERENTIAL INPUT AMPLIFIER
q
INSTRUMENTATION AMPLIFIER
BUILDING BLOCK
q
UNITY-GAIN INVERTING AMPLIFIER
q
G = 1/2 AMPLIFIER
q
G = 2 AMPLIFIER
q
SUMMING AMPLIFIER
q
DIFFERENTIAL CURRENT RECEIVER
q
VOLTAGE-CONTROLLED CURRENT SOURCE
q
BATTERY-POWERED SYSTEMS
q
GROUND LOOP ELIMINATOR
2
3
4
In
+In
V
40k
40k
40k
40k
5
1
Sense
Ref
6
Output
7
V+
INA132
INA132
2
INA132
SPECIFICATIONS: V
S
=
15V
At T
A
= +25
C, V
S
=
15V, R
L
= 10k
connected to Ground, and Reference 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.
INA132P, U
INA132PA, UA
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE
(1)
RTO
Initial
75
250
V
500
V
vs Temperature
1
5
V
10
(4)
V/
C
vs Power Supply
V
S
=
1.35V to
18V
5
30
V
V
V/V
vs Time
0.3
V
V/mo
INPUT IMPEDANCE
(2)
Differential
80
V
k
Common-Mode
80
V
k
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
V
O
= 0V
(V)
2(V+)2
V
V
V
Common-Mode Rejection
V
CM
= 15V to 28V, R
S
= 0
76
90
70
V
dB
OUTPUT VOLTAGE NOISE
(3)
RTO
f = 0.1Hz to 10Hz
1.6
V
Vp-p
f = 1kHz
65
V
nV/
Hz
GAIN
Initial
1
V
V/V
Error
V
O
= 14V to 13.5V
0.01
0.075
V
0.1
%
vs Temperature
(4)
1
10
V
V
ppm/
C
vs Nonlinearity
V
O
= 14V to 13.5V
0.0001
0.001
V
0.002
% of FS
OUTPUT
Voltage, Positive
R
L
= 100k
to Ground
(V+)1
(V+)0.8
V
V
V
Negative
R
L
= 100k
to Ground
(V)+0.5
(V)+0.15
V
V
V
Positive
R
L
= 10k
to Ground
(V+)1.5
(V+)0.8
V
V
V
Negative
R
L
= 10k
to Ground
(V)+1
(V)+0.25
V
V
V
Current Limit, Continuous to Common
12
V
mA
Capacitive Load (Stable Operation)
10,000
V
pF
FREQUENCY RESPONSE
Small Signal Bandwidth
3dB
300
V
kHz
Slew Rate
0.1
V
V/
s
Settling Time: 0.1%
V
O
= 10V Step
85
V
s
0.01%
V
O
= 10V Step
88
V
s
Overload Recovery Time
50% Overdrive
7
V
s
POWER SUPPLY
Rated Voltage
15
V
V
Voltage Range
1.35
18
V
V
V
Quiescent Current
I
O
= 0mA
160
185
V
V
A
TEMPERATURE RANGE
Specification
40
+85
V
V
C
Operation
55
+125
V
V
C
Storage
55
+125
V
V
C
Thermal Resistance,
JA
8-Pin DIP
100
V
C/W
SO-8 Surface-Mount
150
V
C/W
V
Specifications the same as INA132P.
NOTES: (1) Includes effects of amplifier's input bias and offset currents. (2) 40k
resistors are ratio matched but have
20% absolute value. (3) Includes effects
of amplifier's input current noise and thermal noise contribution of resistor network. (4) Guaranteed by wafer test to 95% confidence level.
3
INA132
SPECIFICATIONS: V
S
= +5V
At T
A
= +25
C, V
S
= +5V, R
L
= 10k
connected to V
S
/2, and Reference Pin connected to V
S
/2, unless otherwise noted.
INA132P, U
INA132PA, UA
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE
(1)
RTO
Initial
150
500
V
750
V
vs Temperature
2
V
V/
C
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
0
2(V+)2
V
V
V
Common-Mode Rejection
V
CM
= 0V to 8V, R
S
= 0
76
90
70
V
dB
OUTPUT
Voltage, Positive
R
L
= 100k
(V+)1
(V+)0.75
V
V
V
Negative
R
L
= 100k
+0.25
+0.06
V
V
V
Positive
R
L
= 10k
(V+)1
(V+)0.8
V
V
V
Negative
R
L
= 10k
+0.25
+0.12
V
V
V
POWER SUPPLY
Rated Voltage
+5
V
V
Voltage Range
+2.7
+36
V
V
V
Quiescent Current
I
O
= 0mA
155
185
V
V
A
V
Specifications the same as INA132P.
NOTE: (1) Include effects of amplifier's input bias and offset currents.
PIN CONFIGURATION
TOP VIEW
DIP/SOIC
Ref
In
+In
V
No Internal Connection
V+
Output
Sense
1
2
3
4
8
7
6
5
Supply Voltage, V+ to V .................................................................... 36V
Input Voltage Range ..........................................................................
80V
Output Short-Circuit (to ground) .............................................. 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
ABSOLUTE MAXIMUM RATINGS
ORDERING INFORMATION
PACKAGE
DRAWING
TEMPERATURE
PRODUCT
PACKAGE
NUMBER
(1)
RANGE
INA132PA
8-Pin Plastic DIP
006
40
C to +85
C
INA132P
8-Pin Plastic DIP
006
40
C to +85
C
INA132UA
SO-8 Surface-Mount
182
40
C to +85
C
INA132U
SO-8 Surface-Mount
182
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.
4
INA132
TYPICAL PERFORMANCE CURVES
At T
A
= +25
C and V
S
=
15V, unless otherwise noted.
GAIN vs FREQUENCY
Frequency (Hz)
Closed-Loop Gain (dB)
10k
100k
1M
20
0
20
40
60
V
S
= 15V or +5V
C
L
= 100pF
R
L
= 10k
C
L
= 1000pF
R
L
=
COMMON-MODE REJECTION vs FREQUENCY
Frequency (Hz)
Common-Mode Rejection (dB)
10
100
1k
10k
100k
1M
100
90
80
70
60
50
40
30
V
S
= 15V
V
S
= +5V
POWER SUPPLY REJECTION vs FREQUENCY
Frequency (Hz)
Power Supply Rejection (dB)
10
100
1k
10k
100k
1M
120
100
80
60
40
20
0
V
S
= 15V
+PSRR
PSRR
V
S
= +5V
QUIESCENT and SHORT-CIRCUIT CURRENT vs
TEMPERATURE
Temperature (C)
Quiescent Current (A)
Short-Circuit Current |mA|
75
50
25
0
25
50
75
100
125
210
200
190
180
170
160
150
13
12
11
10
9
8
7
I
SC
I
Q
SLEW RATE vs TEMPERATURE
Temperature (C)
Slew Rate (V/s)
75
50
25
0
25
50
75
100
125
0.18
0.16
0.14
0.12
0.10
0.08
0.06
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
V+
(V+) 0.5
(V+) 1
(V+) 1.5
(V+) 2
(V+) 2.5
(V) +2.5
(V) +2
(V) +1.5
(V) +1
(V) +0.5
V
0
2
4
6
8
10
Output Current (mA)
Output Voltage Swing (V)
125C
125C
85C
55C
85C
85C
25C
40C
40C
25C
55C
5
INA132
TYPICAL PERFORMANCE CURVES
(CONT)
At T
A
= +25
C and V
S
=
15V, unless otherwise noted.
50mV/div
SMALL-SIGNAL STEP RESPONSE
C
L
= 200pF
50mV/div
10
s/div
SMALL-SIGNAL STEP RESPONSE
C
L
= 1000pF
5V/div
LARGE-SIGNAL STEP RESPONSE
100
s/div
10
s/div
0.5
V/div
500ms/div
0.1 to 10Hz PEAK-TO-PEAK
VOLTAGE NOISE
SETTLING TIME vs LOAD CAPACITANCE
Load Capacitance
Settling Time (s)
100pF
1000pF
10,000pF
100
96
92
88
84
80
0.1%
0.01%
10V Step
INPUT COMMON-MODE VOLTAGE RANGE vs
OUTPUT VOLTAGE
Output Voltage (V)
Common-Mode Voltage (V)
15
10
5
0
5
10
15
40
30
20
10
0
10
20
30
40
V
S
= 15V
V
S
= 5V
V
S
= +5V
V
REF
= 0V
6
INA132
TYPICAL PERFORMANCE CURVES
(CONT)
At T
A
= +25
C and V
S
=
15V, unless otherwise noted.
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage Drift (V/C)
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
40
35
30
25
20
15
10
5
0
0.2%
V
S
= 15V
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage (V)
500
400
300
200
100
0
100
200
300
400
500
25
20
15
10
5
0
0.2%
0.1%
0.1%
V
S
= 15V
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage (V)
700
600
500
400
300
200
100
0
100
200
300
400
500
600
700
18
16
14
12
10
8
6
4
2
0
0.1%
V
S
= +5V
0.1%
7
INA132
APPLICATIONS INFORMATION
Figure 1 shows the basic connections required for operation
of the INA132. Power supply bypass capacitors should be
connected close to the device pins.
The differential input signal is connected to pins 2 and 3 as
shown. The source impedances connected to the inputs must
be nearly equal to assure good common-mode rejection. An
8
mismatch in source impedance will degrade the com-
mon-mode rejection of a typical device to approximately
80dB. Gain accuracy will also be slightly affected. If the
source has a known impedance mismatch, an additional
resistor in series with one input can be used to preserve good
common-mode rejection.
Do not interchange pins 1 and 3 or pins 2 and 5, even though
nominal resistor values are equal. These resistors are laser
trimmed for precise resistor ratios to achieve accurate gain
and highest CMR. Interchanging these pins would not pro-
vide specified performance. As shown in Figure 1, measure-
ments should be sensed at the load.
supply ground). Although input voltages on pins 2 and 3
that are below the negative supply voltage will not damage
the device, operation in this region is not recommended.
Transient conditions at the inverting input terminal below
the negative supply can cause a positive feedback condition
that could lock the INA132's output to the negative rail.
The INA132 can accurately measure differential signals that
are above the positive power supply. Linear common-mode
range extends to nearly twice the positive power supply
voltage--see typical performance curve, Common-Mode
Range vs Output Voltage.
OFFSET VOLTAGE TRIM
The INA132 is laser trimmed for low offset voltage and drift.
Most applications require no external offset adjustment.
Figure 2 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. The source
impedance of a signal applied to the Ref terminal should be
less than 8
to maintain good common-mode rejection. To
assure low impedance at the Ref terminal, the trim voltage
can be buffered with an op amp, such as the OPA177.
CAPACITIVE LOAD DRIVE CAPABILITY
The INA132 can drive large capacitive loads, even at low
supplies. It is stable with a 10,000pF load. Refer to the
"Small-Signal Step Response" and "Settling Time vs Load
Capacitance" typical performance curves.
FIGURE 1. Basic Power Supply and Signal Connections.
OPERATING VOLTAGE
The INA132 operates from single (+2.7V to +36V) or dual
(
1.35V to
18V) supplies with excellent performance.
Specifications are production tested with +5V and
15V
supplies. Most behavior remains unchanged throughout the
full operating voltage range. Parameters which vary signifi-
cantly with operating voltage are shown in the typical
performance curves.
The internal op amp in the INA132 is a single-supply design.
This allows linear operation with the op amp's common-
mode voltage equal to, or slightly below V (or single
FIGURE 2. Offset Adjustment.
V
3
5
6
3
V
O
INA132
V
O
= V
3
V
2
Offset Adjustment
Range = 500V
2
R
3
Ref
R
1
R
2
R
4
V
2
8
R = 237k
8
100k
+15V
15V
1
NOTE: For 750V range, R = 158k
.
V
3
5
6
3
INA132
V
OUT
= V
3
V
2
2
R
3
Ref
R
1
R
2
R
4
V
2
40k
40k
40k
40k
R
L
1F
V
4
1F
V+
7
1
8
INA132
5
6
1
3
INA132
2
V
1
V
O
A
2
A
1
R
2
R
2
R
1
In
V
2
+In
V
O
= (1 + 2R
2
/R
1
) (V
2
V
1
)
The INA132 can be combined with op amps to form a complete instru-
mentation amplifier with specialized performance characteristics. Burr-
Brown offers many complete high performance IAs. Products with related
performances are shown at the right.
SIMILIAR COMPLETE
A
1
, A
2
FEATURE
BURR-BROWN IA
OPA27
Low Noise
INA103
OPA129
Ultra Low Bias Current (fA)
INA116
OPA177
Low Offset Drift, Low Noise
INA114,INA128
OPA2130
Low Power, FET-Input (pA)
INA111
OPA2234
Single Supply, Precision,
Low Power
INA122
(1)
, INA118
OPA2237
Single Supply, Low Power,
MSOP-8
INA122
(1)
, INA126
(1)
NOTE: (1) Available 1Q'97.
5
6
1
INA132
BUF634
2
3
V
O
R
L
In
+In
(Low I
Q
mode)
BUF634 inside feedback
loop contributes no error.
FIGURE 4. Low Power, High Output Current Precision
Difference Amplifier.
FIGURE 5. Pseudoground Generator.
5
6
2
(V+)/2
INA132
V+
1
7
4
V+
Ground
Ground
3
FIGURE 3. Precision Instrumentation Amplifier.
FIGURE 6. Differential Input Data Acquisition.
5
6
1
INA132
ADS7806
2
3
4
7
+5V
In
12 Bits
Out
0V-4V
Input
+In
V
CM
= 0V to 8V
S
= 45s (4V Step to 0.01%)
9
INA132
FIGURE 7. Precision Voltage-to-Current Conversion.
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
Precision Unity-Gain Inverting Amplifier
10V Precision Voltage Reference
5V Precision Voltage Reference
Precision Unity-Gain Buffer
Precision Average Value Amplifier
Precision G = 2 Amplifier
Precision Summing Amplifier
Precision G = 1/2 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
Digitally Controlled Gain of
1 Amplifier
5
7
6
3
V
3
INA132
2
4
V
2
1
4
2
+15V
OPA27
REF10
6
10V
I
O
= 4 to 20mA
0V to 10V
In
12.5k
1k
50k
R
LOAD
V+
Set R
1
= R
2
R
2
50.1
R
1
50.1
2N3904
40k
40k
40k
40k
For 4-20mA applications,
the REF10 sets the 4mA
low-scale output for 0V input.
I
O
= V
3
V
2
+
1
40k
1
R
2
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