Burr-Brown Corporation INA121 Manual

FEATURES
LOW BIAS CURRENT:
LOW QUIESCENT CURRENT:
LOW INPUT OFFSET VOLTAGE:
LOW INPUT OFFSET DRIFT:
LOW INPUT NOISE:
20nV/√Hz at f = 1kHz (G =100)
HIGH CMR: 106dB
WIDE SUPPLY RANGE:
LOW NONLINEARITY ERROR: 0.001% max
INPUT PROTECTION TO
8-PIN DIP AND SO-8 SURFACE MOUNT
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
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
SBOS078
®
FET-Input, Low Power
INSTRUMENTATION AMPLIFIER
±
4pA
± µ
450 A
± µ
200
± µ °
2 V/ C
± ±
2.25V to 18V
±
40V
2 Over-Voltage
–
V
IN Protection
1
R
G
8
+ 3 Over-Voltage
V
IN Protection
DESCRIPTION
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
V
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
INA121
A
1
40kΩ 40kΩ
25kΩ
A
3
25kΩ
A
2
40kΩ 40kΩ
4
V–
1
PDS-1412A
INA121
50kΩ
G = 1 +
R
G
6
V
O
5
Ref
INA121
Printed in U.S.A. May, 1998
®