®
INA
121
INA121
INA
121
FET-Input, Low Power
INSTRUMENTATION AMPLIFIER
FEATURES
q
LOW BIAS CURRENT:
±
4pA
q
LOW QUIESCENT CURRENT:
±
450
µ
A
q
LOW INPUT OFFSET VOLTAGE:
±
200
µ
V
q
LOW INPUT OFFSET DRIFT:
±
2
µ
V/
°
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
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
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.
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
V+
7
INA121
V
IN
–
2
Over-Voltage
Protection
A
1
40kΩ
25kΩ
40kΩ
G=1+
1
50kΩ
R
G
R
G
8
25kΩ
A
2
40kΩ
A
3
6
V
O
5
40kΩ
V
IN
+
3
Over-Voltage
Protection
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-1412A
1
Printed in U.S.A.
INA121
May, 1998
BURR-BROWN [ BURR-BROWN CORPORATION ]
