INA128 Datasheet, PDF (1/10 Pages) Burr-Brown (TI) – Precision, Low Power INSTRUMENTATION AMPLIFIERS

®
INA128
INA129
INA128
INA129
INA128
INA129
Precision, Low Power
INSTRUMENTATION AMPLIFIERS
FEATURES
q LOW OFFSET VOLTAGE: 50µV max
q LOW DRIFT: 0.5µV/°C max
q LOW INPUT BIAS CURRENT: 5nA max
q HIGH CMR: 120dB min
q INPUTS PROTECTED TO ±40V
q WIDE SUPPLY RANGE: ±2.25 to ±18V
q LOW QUIESCENT CURRENT: 700µA
q 8-PIN PLASTIC DIP, SO-8
APPLICATIONS
q BRIDGE AMPLIFIER
q THERMOCOUPLE AMPLIFIER
q RTD SENSOR AMPLIFIER
q MEDICAL INSTRUMENTATION
q DATA ACQUISITION
DESCRIPTION
The INA128 and INA129 are low power, general
purpose instrumentation amplifiers offering excellent
accuracy. Their versatile 3-op amp design and small
size make them ideal for a wide range of applications.
Current-feedback input circuitry provides wide band-
width even at high gain (200kHz at G = 100).
A single external resistor sets any gain from 1 to
10,000. INA128 provides an industry standard gain
equation; INA129’s gain equation is compatible with
the AD620.
The INA128/INA129 is laser trimmed for very low
offset voltage (50µV), drift (0.5µV/°C) and high com-
mon-mode rejection (120dB at G ≥ 100). It operates
with power supplies as low as ±2.25V, and quiescent
current is only 700µA—ideal for battery operated
systems. Internal input protection can withstand up to
±40V without damage.
The INA128/INA129 is available in 8-pin plastic
DIP, and SO-8 surface-mount packages, specified for
the –40°C to +85°C temperature range. The INA128
is also available in dual configuration, the INA2128.
–
2 Over-Voltage
V_IN
Protection
1
R_G
8
+
3 Over-Voltage
V_IN
Protection
A₁
25kΩ⁽¹⁾
25kΩ⁽¹⁾
A₂
V+
7
40kΩ
INA128, INA129
40kΩ
6
A₃
INA128:
G = 1 + ^50kΩ
R_G
INA129:
G = 1 + ^49.4kΩ
R_G
V_O
40kΩ
40kΩ
5
Ref
4
NOTE: (1) INA129: 24.7kΩ
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]
©1995 Burr-Brown Corporation
PDS-1296C
Printed in U.S.A. October, 1996