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® INA121
INA121
INA121
FET-Input, Low Power
INSTRUMENTATION AMPLIFIER
FEATURES
DESCRIPTION
q LOW BIAS CURRENT: ±4pA
q LOW QUIESCENT CURRENT: ±450µA
q LOW INPUT OFFSET VOLTAGE: ±200µV
q LOW INPUT OFFSET DRIFT: ±2µV/°C
q LOW INPUT NOISE:
20nV/Hz at f = 1kHz (G =100)
q HIGH CMR: 106dB
q WIDE SUPPLY RANGE: ±2.25V to ±18V
q LOW NONLINEARITY ERROR: 0.001% max
q INPUT PROTECTION TO ±40V
q 8-PIN DIP AND SO-8 SURFACE MOUNT
APPLICATIONS
q LOW-LEVEL TRANSDUCER AMPLIFIERS
Bridge, RTD, Thermocouple
q PHYSIOLOGICAL AMPLIFIERS
ECG, EEG, EMG, Respiratory
q HIGH IMPEDANCE TRANSDUCERS
q CAPACITIVE SENSORS
q MULTI-CHANNEL DATA ACQUISITION
q PORTABLE, BATTERY OPERATED SYSTEMS
q GENERAL PURPOSE INSTRUMENTATION
The INA121 is a FET-input, low power instrumenta-
tion amplifier offering excellent accuracy. Its versatile
three-op amp design and very small size make it ideal
for a variety of general purpose applications. Low bias
current (±4pA) allows use with high impedance
sources.
Gain can be set from 1V to 10,000V/V with a single
external resistor. Internal input protection can with-
stand up to ±40V without damage.
The INA121 is laser-trimmed for very low offset
voltage (±200µV), low offset drift (±2µV/°C), and
high common-mode rejection (106dB at G = 100). It
operates on power supplies as low as ±2.25V (+4.5V),
allowing use in battery operated and single 5V sys-
tems. Quiescent current is only 450µA.
Package options include 8-pin plastic DIP and SO-8
surface mount. All are specified for the –40°C to
+85°C industrial temperature range.
V+
7
VIN
2 Over-Voltage
Protection
1
RG
8
A1
25k
40k
25k
INA121
40k
G = 1 + 50k
RG
6
A3 VO
+ 3 Over-Voltage
VIN Protection
A2
40k
40k
5
Ref
4
V–
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
©1997 Burr-Brown Corporation
PDS-11412A
IPNrinAted1in2U1.S.A. May, 1998
®

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SPECIFICATIONS: VS = ±15V
At TA = +25°C, VS = ±15V, RL = 10k, and IA reference = 0V, unless otherwise noted.
PARAMETER
INPUT
Offset Voltage, RTI
vs Temperature
vs Power Supply
Long-Term Stability
Impedance, Differential
Common-Mode
Input Voltage Range
Safe Input Voltage
Common-Mode Rejection
BIAS CURRENT
vs Temperature
Offset Current
vs Temperature
NOISE, RTI
Voltage Noise: f = 10Hz
f = 100Hz
f = 1kHz
f = 0.1Hz to 10Hz
Current Noise: f = 1kHz
GAIN
Gain Equation
Range of Gain
Gain Error
Gain vs Temperature(1)
Nonlinearity
OUTPUT
Voltage: Positive
Negative
Positive
Negative
Capacitance Load Drive
Short-Circuit Current
FREQUENCY RESPONSE
Bandwidth, –3dB
Slew Rate
Settling Time, 0.01%
Overload Recovery
POWER SUPPLY
Voltage Range
Quiescent Current
TEMPERATURE RANGE
Specification
Operating
Storage
Thermal Resistance, θJA
8-Lead DIP
SO-8 Surface Mount
CONDITIONS
INA121P, U
MIN TYP
MAX
VS = ±2.25V to ±18V
VO = 0V
VCM = –12.5V to 13.5V
G=1
G = 10
G = 100
G = 1000
VCM = 0V
RS = 0
G = 100
G = 100
G = 100
G = 100
±200±200/G ±500±500/G
±2±2/G
±5±20/G
±5±20/G ±50±150/G
±0.5
1012 || 1
1012 || 12
See Text and Typical Curves
±40
78 86
91 100
96 106
106
±4
See Typical Curve
±0.5
See Typical Curve
±50
30
21
20
1
1
VO = –14V to 13.5V
G=1
G = 10
G = 100
G = 1000
G=1
G>1
VO = –14V to 13.5V
G=1
G = 10
G = 100
G = 1000
1 + (50k/RG)
1 10,000
±0.01
±0.03
±0.05
±0.5
±1
±25
±0.05
±0.4
±0.5
±10
±100
±0.0002
±0.0015
±0.0015
±0.002
±0.001
±0.005
±0.005
RL = 100k
RL = 100k
RL = 10k
RL = 10k
(V+)–1.5
(V–)+1
(V+)–0.9
(V–)+0.15
(V+)–0.9
(V–)+0.25
1000
±14
G=1
G = 10
G = 100
G = 1000
VO = ±10V, G 10
G = 1 to 10
G = 100
G = 1000
50% Input Overload
600
300
50
5
0.7
20
35
260
5
IO = 0V
±2.25
–40
–55
–55
±15
±450
100
150
±18
±525
85
125
125
INA121PA, UA
MIN TYP
MAX
UNITS
±300±200/G ±1000±1000/G
T ±15±20/G
TT
T
T
T
T
T
µV
µV/°C
µV/V
µV/mo
|| pF
|| pF
V
72 T
85 T
90 T
T
T
T
T
T
dB
dB
dB
dB
T pA
pA
T nV/Hz
T nV/Hz
T nV/Hz
T µVp-p
T fA/Hz
T
T
T
T
T
T
T
T
V/V
T V/V
±0.1 %
±0.5 %
±0.7 %
%
T ppm/°C
T ppm/°C
T
±0.002
% of FSR
T
±0.008
% of FSR
T
±0.008
% of FSR
T % of FSR
T
T
TT
TT
T
T
V
V
V
V
pF
mA
T kHz
T kHz
T kHz
T kHz
T V/µs
T µs
T µs
T µs
T µs
TT
T
TV
T µA
T
T
T
T
T
T °C
T °C
T °C
°C/W
°C/W
T Specification same as INA121P, U.
NOTE: (1) Temperature coefficient of the “Internal Resistor” in the gain equation. Does not include TCR of gain-setting resistor, RG.
®
INA121
2

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PIN CONFIGURATION
Top View
8-Pin DIP and SO-8
RG 1
V–IN 2
V+IN 3
V– 4
Top View
8 RG
7 V+
6 VO
5 Ref
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate 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.
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage .................................................................................. ±18V
Analog Input Voltage Range ............................................................. ±40V
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.
PACKAGE/ORDERING INFORMATION
PRODUCT
Single
INA121P
INA121PA
INA121U
"
INA121UA
"
PACKAGE
8-Pin DIP
8-Pin DIP
SO-8 Surface-Mount
"
SO-8 Surface-Mount
"
PACKAGE
DRAWING
NUMBER(1)
006
006
182
"
182
"
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
"
–40°C to +85°C
"
PACKAGE
MARKING
INA121P
INA121PA
INA121U
"
INA121UA
"
ORDERING
NUMBER(2)
INA121P
INA121PA
INA121U
INA121U/2K5
INA121UA
INA121UA/2K5
TRANSPORT
MEDIA
Rails
Rails
Rails
Tape and Reel
Rails
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 “INA121U/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.
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.
®
3 INA121

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TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, unless otherwise noted.
60
G = 1000V/V
50
GAIN vs FREQUENCY
40
G = 100V/V
30
20
G = 10V/V
10
0 G = 1V/V
–10
–20
1k
10k 100k 1M
Frequency (Hz)
10M
120
100
80
60
40
20
0
10
COMMON-MODE REJECTION
vs FREQUENCY
G = 1000V/V
G = 100V/V
G = 10V/V
G = 1V/V
100
1k
10k 100k
1M
Frequency (Hz)
120
100
80
60
40
20
0
10
POSITIVE POWER SUPPLY REJECTION
vs FREQUENCY
G = 1000V/V
G = 100V/V
G = 10V/V
G = 1V/V
100
1k
10k 100k
1M
Frequency (Hz)
NEGATIVE POWER SUPPLY REJECTION
vs FREQUENCY
120
G = 1000V/V
100
G = 100V/V
G = 10V/V
80
G = 1V/V
60
40
20
0
10 100 1k 10k 100k
Frequency (Hz)
1M
15
10
5
0
–5
–10
–15
–15
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE, VS = ±15V
VD/2
VD/2
+
VCM
+
+–
+15V
VO
Ref
–15V
–10 –5
0
5
Output Voltage (V)
G=1
G 10
10 15
5
4
3
2
1
0
–1
–2
–3
–4
–5
–5
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE, VS = ±5V, ±2.5V
G 10
G=1
G 10
G=1
VS = ±5V
VS = ±2.5V
–4 –3 –2 –1 0 1 2
Output Voltage (V)
34
5
®
INA121
4

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TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, unless otherwise noted.
INPUT BIAS CURRENT vs TEMPERATURE
10k
1k
100
10
IB
1
IOS
0.1
0.01
–75 –50 –25
0
25 50
Temperature (°C)
75 100 125
INPUT BIAS CURRENT
vs COMMON-MODE INPUT VOLTAGE
1m
100µ
10µ
10p
1p
–10µ
–100µ
–1m
–20 –15 –10 –5 0
5 10
Common-Mode Voltage (V)
15 20
INPUT OVER-VOLTAGE V/I CHARACTERISTICS
1
0.8
0.6 Flat region represents
0.4 normal linear operation.
G = 1V/V
G = 1000V/V
0.2
0
–0.2 +15V
–0.4
–0.6
–0.8
G = 1V/V
G = 1000V/V
VIN
IIN –15V
–1
–50 –40 –30 –20 –10 0 10 20 30 40 50
Input Voltage (V)
1000
100
10
1
SETTLING TIME vs GAIN
0.01%
0.1%
10 100
Gain (V/V)
1000
QUIESCENT CURRENT AND SLEW RATE
vs TEMPERATURE
500 1.4
475 1.2
IQ
450 1
425 0.8
SR
400 0.6
375
–75 –50 –25
0 25 50
Temperature (°C)
0.4
75 100 125
SHORT-CIRCUIT CURRENT
vs TEMPERATURE
±15
+ISC
±14
±13
–ISC
±12
±11
±10
–75 –50 –25
0 25 50
Temperature (°C)
75 100 125
®
5 INA121