Burr Brown INA121U, INA121PA, INA121P, INA121UA-2K5, INA121UA Datasheet

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INA121

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

®

INA121

INA121

INA121

©1997 Burr-Brown Corporation PDS-1412A Printed in U.S.A. May, 1998

FEATURES

● LOW BIAS CURRENT: ±4pA

● LOW QUIESCENT CURRENT:

±450µA

● LOW INPUT OFFSET VOLTAGE:

±200µV

● LOW INPUT OFFSET DRIFT:

±2µV/°C

● LOW INPUT NOISE:
20nV/√Hz at f = 1kHz (G =100)

● HIGH CMR: 106dB

● WIDE SUPPLY RANGE:

±2.25V to ±18V

● LOW NONLINEARITY ERROR: 0.001% max

● INPUT PROTECTION TO

±40V

● 8-PIN DIP AND SO-8 SURFACE MOUNT

FET-Input, Low Power

INSTRUMENTATION AMPLIFIER

DESCRIPTION

The INA121 is a FET-input, low power instrumenta­tion 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 with­stand 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 sys­tems. 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.

APPLICATIONS

● LOW-LEVEL TRANSDUCER AMPLIFIERS

Bridge, RTD, Thermocouple

● PHYSIOLOGICAL AMPLIFIERS

ECG, EEG, EMG, Respiratory

● HIGH IMPEDANCE TRANSDUCERS

● CAPACITIVE SENSORS

● MULTI-CHANNEL DATA ACQUISITION

● PORTABLE, BATTERY OPERATED SYSTEMS

● GENERAL PURPOSE INSTRUMENTATION

A

1

A

2

A

3

6

40kΩ40kΩ

40kΩ40kΩ

7

4

3

8

1

2

V

IN

V

IN

R

G

V+

V–

INA121

Ref

V

O

G = 1 +

50kΩ

R

G

–

+

5

Over-Voltage

Protection

25kΩ

25kΩ

Over-Voltage

Protection

2

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INA121

SPECIFICATIONS: VS = ±15V

At TA = +25°C, VS = ±15V, RL = 10kΩ, and IA reference = 0V, unless otherwise noted.

✻ 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, R

G

.

INA121P, U INA121PA, UA
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
INPUT

Offset Voltage, RTI ±200±200/G ±500±500/G ±300±200/G

±1000±1000/G

µV

vs Temperature ±2±2/G ±5±20/G ✻ ±15±20/G µV/°C
vs Power Supply V

S

= ±2.25V to ±18V ±5±20/G ±50±150/G ✻✻µV/V

Long-Term Stability ±0.5 ✻ µV/mo

Impedance, Differential 10

12

|| 1 ✻ Ω || pF

Common-Mode V

O

= 0V 10

12

|| 12 ✻ Ω || pF
Input Voltage Range See Text and Typical Curves ✻
Safe Input Voltage ±40 ✻ V
Common-Mode Rejection V

CM

= –12.5V to 13.5V

G = 1 78 86 72 ✻ dB

G = 10 91 100 85 ✻ dB

G = 100 96 106 90 ✻ dB

G = 1000 106 ✻ dB

BIAS CURRENT V

CM

= 0V ±4 ±50 ✻✻pA

vs Temperature See Typical Curve ✻

Offset Current ±0.5 ✻ pA

vs Temperature See Typical Curve ✻

NOISE, RTI R

S

= 0Ω

Voltage Noise: f = 10Hz G = 100 30 ✻ nV/√Hz

f = 100Hz G = 100 21 ✻ nV/√Hz
f = 1kHz G = 100 20 ✻ nV/√Hz
f

= 0.1Hz to 10Hz G = 100 1 ✻ µVp-p

Current Noise: f = 1kHz 1 ✻ fA/√Hz

GAIN

Gain Equation 1 + (50kΩ/R

G

) ✻ V/V
Range of Gain 1 10,000 ✻✻V/V
Gain Error V

O

= –14V to 13.5V

G = 1 ±0.01 ±0.05 ✻ ±0.1 %

G = 10 ±0.03 ±0.4 ✻ ±0.5 %

G = 100 ±0.05 ±0.5 ✻ ±0.7 %

G = 1000 ±0.5 ✻ %

Gain vs Temperature

(1)

G = 1 ±1 ±10 ✻✻ppm/°C
G > 1 ±25 ±100 ✻✻ppm/°C

Nonlinearity V

O

= –14V to 13.5V

G = 1 ±0.0002 ±0.001 ✻ ± 0.002 % of FSR

G = 10 ±0.0015 ±0.005 ✻ ± 0.008 % of FSR

G = 100 ±0.0015 ±0.005 ✻ ±0.008 % of FSR

G = 1000 ±0.002 ✻ % of FSR

OUTPUT

Voltage: Positive R

L

= 100kΩ (V+)–0.9 ✻ V

Negative R

L

= 100kΩ (V–)+0.15 ✻ V

Positive R

L

= 10kΩ (V+)–1.5 (V+)–0.9 ✻✻ V

Negative R

L

= 10kΩ (V–)+1 (V–)+0.25 ✻✻ V
Capacitance Load Drive 1000 ✻ pF
Short-Circuit Current ±14 ✻ mA

FREQUENCY RESPONSE

Bandwidth, –3dB G = 1 600 ✻ kHz

G = 10 300 ✻ kHz

G = 100 50 ✻ kHz

G = 1000 5 ✻ kHz

Slew Rate V

O

= ±10V, G ≤ 10 0.7 ✻ V/µs

Settling Time, 0.01% G = 1 to 10 20 ✻ µs

G = 100 35 ✻ µs

G = 1000 260 ✻ µs

Overload Recovery 50% Input Overload 5 ✻ µ s

POWER SUPPLY

Voltage Range ±2.25 ±15 ±18 ✻✻ ✻ V
Quiescent Current I

O

= 0V ±450 ±525 ✻✻µA

TEMPERATURE RANGE

Specification –40 85 ✻✻°C
Operating –55 125 ✻✻°C
Storage –55 125 ✻✻°C
Thermal Resistance,

θ

JA

8-Lead DIP 100 ✻ °C/W
SO-8 Surface Mount 150 ✻ °C/W

3

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INA121

PIN CONFIGURATION

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.

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.

ABSOLUTE MAXIMUM RATINGS

(1)

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.

Top View 8-Pin DIP and SO-8

R

G

V

–

IN

V

+

IN

V–

R

G

V+
V

O

Ref

1
2
3
4

8
7
6
5

Top View

PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER(1) RANGE MARKING NUMBER(2) MEDIA
Single

INA121P 8-Pin DIP 006 –40°C to +85°C INA121P INA121P Rails
INA121PA 8-Pin DIP 006 –40°C to +85°C INA121PA INA121PA Rails
INA121U SO-8 Surface-Mount 182 –40°C to +85°C INA121U INA121U Rails

" " " " " INA121U/2K5 Tape and Reel

INA121UA SO-8 Surface-Mount 182 –40°C to +85°C INA121UA INA121UA Rails

" " " " " INA121UA/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 “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.

PACKAGE/ORDERING INFORMATION

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INA121

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VS = ±15V, unless otherwise noted.

NEGATIVE POWER SUPPLY REJECTION

vs FREQUENCY

Frequency (Hz)

Power Supply Rejection (dB)

10 100 10k 100k 1M1k

120

100

80

60

40

20

0

G = 1000V/V

G = 1V/V

G = 10V/V

G = 100V/V

INPUT COMMON-MODE RANGE

vs OUTPUT VOLTAGE, V

S

= ±15V

Output Voltage (V)

Common-Mode Voltage (V)

–15 –10 0 5 15–5

15

10

5

0

–5

–10

–15

10

V

D/2

+
–

+
–

+

V

CM

V

O

V

D/2

Ref

–15V

+15V

G = 1
G ≥ 10

POSITIVE POWER SUPPLY REJECTION

vs FREQUENCY

Frequency (Hz)

Power Supply Rejection (dB)

10 100 10k 100k 1M1k

120

100

80

60

40

20

0

G = 1000V/V

G = 1V/V

G = 10V/V

G = 100V/V

COMMON-MODE REJECTION

vs FREQUENCY

Frequency (Hz)

Common-Mode Rejection (dB)

10 100 10k 100k 1M1k

120

100

80

60

40

20

0

G = 1000V/V

G = 1V/V

G = 10V/V

G = 100V/V

INPUT COMMON-MODE RANGE

vs OUTPUT VOLTAGE, V

S

= ±5V, ±2.5V

Output Voltage (V)

Common-Mode Voltage (V)

–5

5
4
3
2
1

0
–1
–2
–3
–4
–5

–4 –3 –2 –1 0 1 2 3 4 5

VS = ±5V
V

S

= ±2.5V

G = 1

G ≥ 10

G = 1

G ≥ 10

GAIN vs FREQUENCY

Frequency (Hz)

Gain (dB)

1k 10k 1M 10M100k

60
50
40
30
20
10

0
–10
–20

G = 1000V/V

G = 100V/V

G = 10V/V

G = 1V/V