High-Speed, Precision
DIFFERENCE AMPLIFIER (G = 1)
1999 Burr-Brown Corporation
PDS-1482B
Printed in U.S.A. March, 1999
FEATURES
q
DESIGNED FOR LOW COST
q
LOW OFFSET VOLTAGE:
750
V max
q
LOW OFFSET DRIFT:
2
V
C
q
LOW GAIN ERROR:
0.05% max
q
WIDE BANDWIDTH: 3MHz
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: 2.4mA
q
SO-8 SURFACE-MOUNT PACKAGE
INA154
DESCRIPTION
The INA154 is a high slew rate, unity-gain difference
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 input common-mode
voltage range extends beyond the positive and nega-
tive supply rails. It operates on
4V to
18V supplies.
The difference amplifier is the foundation of many
commonly used circuits. The INA154 provides this
circuit function without using an expensive precision
resistor network. The INA154 is available in a SO-8
surface-mount package and is specified for operation
over the extended industrial temperature range, 40
C
to +85
C.
APPLICATIONS
q
DIFFERENTIAL INPUT AMPLIFIER
q
INSTRUMENTATION AMPLIFIER
BUILDING BLOCK
q
UNITY-GAIN INVERTING AMPLIFIER
q
SUMMING AMPLIFIER
q
DIFFERENTIAL CURRENT RECEIVER
q
VOLTAGE-CONTROLLED CURRENT SOURCE
q
SYNCHRONOUS DEMODULATOR
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/ Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
2
3
4
In
+In
V
25k
25k
25k
25k
5
1
Sense
Ref
6
Output
7
V+
INA154
For most current data sheet and other product
information, visit www.burr-brown.com
2
INA154
SPECIFICATIONS: V
S
=
15V
At T
A
= +25
C, V
S
=
15V, R
L
= 2k
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.
INA154U
INA154UA
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE
(1)
RTO
Initial
100
750
V
1500
V
vs Temperature
2
20
V
V
V/
C
vs Power Supply
V
S
=
4V to
18V
5
60
V
V
V/V
vs Time
0.5
V
V/mo
INPUT IMPEDANCE
(2)
Differential
50
V
k
Common-Mode
50
V
k
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Positive
V
O
= 0V
2(V+) 5
2(V+) 4
V
V
V
Negative
V
O
= 0V
2(V) + 5
2(V) + 2
V
V
V
Common-Mode Rejection Ratio
V
CM
= 25V to 25V, R
S
= 0
80
90
74
V
dB
OUTPUT VOLTAGE NOISE
(3)
RTO
f = 0.1Hz to 10Hz
2.6
V
Vp-p
f = 1kHz
52
V
nV/
Hz
GAIN
Initial
1
V
V/V
Error
V
O
= 13V to +13V
0.02
0.05
V
0.1
%
vs Temperature
1
10
V
V
ppm/
C
Nonlinearity
V
O
= 13V to +13V
0.0001
0.001
V
0.002
% of FS
OUTPUT
Voltage, Positive
(V+) 2
(V+) 1.8
V
V
V
Negative
(V) + 2
(V) + 1.6
V
V
V
Current Limit, Continuous to Common
60
V
mA
Capacitive Load (stable operation)
500
V
pF
FREQUENCY RESPONSE
Small-Signal Bandwidth
3dB
3.1
V
MHz
Slew Rate
14
V
V/
s
Settling Time: 0.1%
10V Step, C
L
= 100pF
2
V
s
0.01%
10V Step, C
L
= 100pF
3
V
s
Overload Recovery Time
50% Overdrive
3
V
s
POWER SUPPLY
Rated Voltage
15
V
V
Operating Voltage Range
4
18
V
V
V
Quiescent Current
I
O
= 0mA
2.4
2.9
V
V
mA
TEMPERATURE RANGE
Specified
40
+85
V
V
C
Operation
55
+125
V
V
C
Storage
55
+125
V
V
C
Thermal Resistance,
JA
SO-8 Surface-Mount
150
V
C/W
V
Specifications the same as INA154U.
NOTES: (1) Includes effects of amplifier's input bias and offset currents. (2) 25k
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.
3
INA154
PIN CONFIGURATION
TOP VIEW
SO-8
Supply Voltage, V+ to V .................................................................... 40V
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
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
ABSOLUTE MAXIMUM RATINGS
(1)
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.
PACKAGE
SPECIFIED
DRAWING
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
PACKAGE
NUMBER
(1)
RANGE
MARKING
NUMBER
(2)
MEDIA
INA154U
SO-8 Surface-Mount
182
40
C to +85
C
INA154U
INA154U
Rails
"
"
"
"
"
INA154U/2K5
Tape and Reel
INA154UA
SO-8 Surface-Mount
182
40
C to +85
C
INA154UA
INA154UA
Rails
"
"
"
"
"
INA154UA/2K5
Tape and Reel
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with a slash (/) are
available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of "INA154U/2K5" will get a single
2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.
PACKAGE/ORDERING INFORMATION
Ref
In
+In
V
NIC
V+
Output
Sense
1
2
3
4
8
7
6
5
NC = No Internal Connection
4
INA154
TYPICAL PERFORMANCE CURVES
At T
A
= +25
C and V
S
=
15V, unless otherwise noted.
GAIN vs FREQUENCY
Frequency (Hz)
Voltage Gain (dB)
1k
10k
100k
1M
10M
10
0
10
20
30
COMMON-MODE REJECTION RATIO vs FREQUENCY
Frequency (Hz)
Common-Mode Rejection Ratio (dB)
1k
10k
100k
1M
100
80
60
40
20
0
POWER SUPPLY REJECTION RATIO vs FREQUENCY
Frequency (Hz)
Power Supply Rejection Ratio (dB)
100
1k
10k
100k
1M
120
100
80
60
40
20
0
PSRR
+PSRR
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
Frequency (Hz)
Output Voltage (Vp-p)
100
1k
10k
100k
1M
10M
40
30
20
10
0
INPUT COMMON-MODE VOLTAGE RANGE
vs OUTPUT VOLTAGE
Output Voltage (V)
Common-Mode Voltage (V)
20
15
10
5
0
5
10
15
20
40
30
20
10
0
10
20
30
40
50
V
REF
= 0V
R
L
= 2k
V
S
=
15V
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
Frequency (Hz)
THD+Noise (%)
20
100
1k
10k
20k
1
0.1
0.010
0.001
0.0001
V
O
= 10Vrms
R
L
= 600
R
L
= 100k
R
L
= 2k
5
INA154
TYPICAL PERFORMANCE CURVES
(CONT)
At T
A
= +25
C, and V
S
=
15V, 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
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
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
14
13
12
11
10
9
9
10
11
12
13
14
0
20
40
60
80
100
Output Current (mA)
Output Voltage Swing (V)
55
C
55
C
25
C
85
C
85
C
125
C
125
C
25
C
6
INA154
TYPICAL PERFORMANCE CURVES
(CONT)
At T
A
= +25
C, and V
S
=
15V, unless otherwise noted.
SMALL-SIGNAL STEP RESPONSE
1
s/div
50mV/div
LARGE-SIGNAL STEP RESPONSE
1
s/div
5V/div
C
L
= 100pF
C
L
= 500pF
SMALL-SIGNAL OVERSHOOT
vs LOAD CAPACITANCE
Load Capacitance (pF)
Overshoot (%)
0
400
800
1200
1600
2000
70
60
50
40
30
20
10
0
R
L
= 2k
100mV Step
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
Percent of Units (%)
Offset Voltage (
V)
1000
900
800
700
600
500
400
300
200
100
0
100
200
300
400
500
600
700
800
900
1000
25
20
15
10
5
0
Typical Production
Distribution of
Packaged Units.
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
Percent of Units (%)
Offset Voltage Drift (
V/
C)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
25
20
15
10
5
0
Typical production distribution
of packaged units.
C
L
= 500pF
7
INA154
APPLICATIONS INFORMATION
Figure 1 shows the basic connections required for operation
of the INA154. Decoupling capacitors are strongly recom-
mended in applications with noisy or high impedance power
supplies. The capacitors should be placed close to the
device pins as shown in Figure 1.
As shown in Figure 1, the output is referred to the reference
terminal (pin 1). A voltage applied to this pin will be
summed with output signal. The differential input signal is
connected to pins 2 and 3. The source impedances con-
nected to the pinouts must be nearly equal to assure good
common-mode rejection. A 5
mismatch in source imped-
ance will degrade the common-mode rejection of a typical
device to approximately 80dB (a 10
mismatch degrades
CMR to 74dB). 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.
Do not interchange pins 1 and 3 or pins 2 and 5, even though
nominal resistor values are equal. The resistors are laser
trimmed for precise resistor ratios to achieve accurate gain
and highest CMR. Interchanging these pins would not
provide specified performance.
OPERATING VOLTAGE
The INA154 operates from
4V to
18V supplies with
excellent performance. Most behavior remains unchanged
throughout the full operating voltage range. Parameters
which vary significantly with operating voltage are shown
in the Typical Performance Curves.
INPUT VOLTAGE RANGE
The INA154 can accurately measure differential signals
that are beyond the positive or negative power supply rails.
The linear common-mode range extends from 2(V+) 5V
to 2(V) +5V. See the Typical Performance Curve, "Input
Common-Mode Range vs Output Voltage."
OFFSET VOLTAGE TRIM
The INA154 is laser trimmed for low offset voltage and
drift. Most applications require no external offset adjust-
ment. 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 as
shown in Figure 2. The source impedance of a signal
applied to the Ref terminal should be less than 10
to
maintain good common-mode rejection.
FIGURE 1. Basic Power Supply and Signal Connections.
V
3
5
6
3
V
O
INA154
V
O
= V
3
V
2
Offset Adjustment
Range =
1V
2
R
3
R
1
R
2
R
4
V
2
10
150k
10
100k
+15V
15V
1
FIGURE 2. Offset Adjustment.
V
3
5
6
3
INA154
V
OUT
= V
3
V
2
2
Ref
R
1
25k
R
3
25k
R
2
25k
R
4
V
2
25k
R
L
1
F
V
4
1
F
V+
7
1
8
INA154
The INA154 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 IAs
OPA227
Low Noise
INA103
OPA129
Ultra Low Bias Current (fA)
INA116
OPA277
Low Offset Drift, Low Noise
INA114, INA128
OPA2134
FET Input (pA)
INA111, INA121
FIGURE 5. Boosting Output Current.
FIGURE 6. Pseudoground Generator.
FIGURE 4. Precision Instrumentation Amplifier.
5
6
1
3
INA154
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
)
V
1
V
2
5
6
1
3
V
0
= V
1
+ V
2
INA154
2
FIGURE 3. Precision Summing Amplifier.
5
6
1
INA154
BUF634
2
3
V
O
R
L
In
+In
(Low I
Q
mode)
BUF634 inside feedback
loop contributes no error.
5
6
2
(V+)/2
INA154
V+
1
7
4
V+
Ground
Ground
3
9
INA154
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 (see INA157)
Precision G = 1/2 Amplifier (see INA157)
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
INA154
2
4
V
2
1
4
2
+15V
OPA227
REF102
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
25k
25k
25k
25k
For 4-20mA applications,
the REF102 sets the 4mA
low-scale output for 0V input.
I
O
= V
3
V
2
+
1
40k
1
R
2
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