INA121 Datasheet, PDF (1/20 Pages) Burr-Brown (TI) – FET-Input, Low Power INSTRUMENTATION AMPLIFIER

SBOS078
®
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
V_I^–_N
2 Over-Voltage
Protection
1
R_G
8
A₁
25kΩ
40kΩ
25kΩ
INA121
40kΩ
G = 1 + ^50kΩ
R_G
6
A₃
V_O
+ 3 Over-Voltage
A₂
V_IN
Protection
40kΩ
40kΩ
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: [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]
©1997 Burr-Brown Corporation
PDS-11412A
®
I^PN^rinA^ted1ⁱⁿ2^U1^{.S.A. May, 1998}