INA128 Datasheet, PDF (1/20 Pages) Burr-Brown (TI) – Precision, Low Power INSTRUMENTATION AMPLIFIERS

INA128
INA129
SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005
Precision, Low Power
INSTRUMENTATION AMPLIFIERS
FEATURES
D LOW OFFSET VOLTAGE: 50µV max
D LOW DRIFT: 0.5µV/5C max
D LOW INPUT BIAS CURRENT: 5nA max
D HIGH CMR: 120dB min
D INPUTS PROTECTED TO +40V
D WIDE SUPPLY RANGE: +2.25V to +18V
D LOW QUIESCENT CURRENT: 700µA
D 8-PIN PLASTIC DIP, SO-8
APPLICATIONS
D BRIDGE AMPLIFIER
D THERMOCOUPLE AMPLIFIER
D RTD SENSOR AMPLIFIER
D MEDICAL INSTRUMENTATION
D DATA ACQUISITION
DESCRIPTION
The INA128 and INA129 are low power, general
purpose instrumentation amplifiers offering excellent
accuracy. The versatile 3-op amp design and small size
make them ideal for a wide range of applications.
Current-feedback input circuitry provides wide
bandwidth even at high gain (200kHz at G = 100).
A single external resistor sets any gain from 1 to 10,000.
The INA128 provides an industry-standard gain
equation; the INA129 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
common-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 a 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
INA128, INA129
40kΩ
40kΩ
6
A₃
40kΩ
5
40kΩ
4
NOTE: (1) INA129: 24.7kΩ
V−
INA128:
G = 1 + ^50kΩ
R_G
INA129:
G = 1 + ^49.4kΩ
R_G
V_O
Ref
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