INA120 Datasheet, PDF (1/12 Pages) Texas Instruments – INSTRUMENTATION AMPLIFIER

®
INA120
Precision
INSTRUMENTATION AMPLIFIER
FEATURES
q LOW OFFSET VOLTAGE: 25µV max
q LOW OFFSET VOLTAGE DRIFT:
0.25µV/°C max
q PIN-STRAPPED GAINS: 1, 10, 100, 1000
q LOW GAIN DRIFT: 30ppm/°C max
at G = 100
q HIGH COMMON-MODE REJECTION:
106dB at 60Hz, G = 100
APPLICATIONS
q BRIDGE AMPLIFIER
q THERMOCOUPLE AMPLIFIER
q RTD SENSOR AMPLIFIER
q MEDICAL INSTRUMENTATION
q DATA ACQUISITION SYSTEM
q SWITCHED-GAIN AMPLIFIER
Gain Sense 1 4 3 –In
Gain Set 1 5
1kΩ
2kΩ
1kΩ
RC 8
44Ω
X1000 9
400Ω
X100 10
1kΩ
2kΩ
X10 11
1kΩ
DESCRIPTION
The INA120 is a precision instrumentation amplifier
ideal for accurate signal acquisition. It combines pre-
cision, protected-input operational amplifiers, laser-
trimmed gain-setting resistors, and a high common-
mode rejection difference amplifier on a single chip.
Simple pin-strapped connections set precise gains of 1,
10, 100 or 1000. External resistors can be used to set
any gain from one to 5000. Gains can be digitally
selected with an external multiplexer. Gain-sense con-
nections on the INA120 maintain accuracy when using
multiplexer or gain-switching circuitry. Low power
dissipation and careful on-chip thermal management
reduce warm-up drift and assure excellent long-term
stability.
The INA120 is available in both plastic and ceramic
18-pin DIP packages, specified for the industrial tem-
perature range.
Offset Adjust
67
A1 Out
12
V+ V–
2 17
+
A₁
–
20kΩ
–
A₂
+
20kΩ
10kΩ
10kΩ
10kΩ
–
A₃
+
10kΩ
1 V_O
18 Com
Gain Set 2 14 15 16 +In
Gain
Sense 2
13
A2 Out
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
©_{1989 Burr-Brown Corporation}
PDS-1071
Printed in U.S.A. March, 1992