INA128
INA129
SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005
Precision, Low Power
INSTRUMENTATION AMPLIFIERS
FD EATURES
DESCRIPTION
LOW OFFSET VOLTAGE: 50µV max
LOW DRIFT: 0.5µV/5C max
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).
D
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D
D
D
LOW INPUT BIAS CURRENT: 5nA max
HIGH CMR: 120dB min
INPUTS PROTECTED TO +40V
WIDE SUPPLY RANGE: +2.25V to +18V
LOW QUIESCENT CURRENT: 700µA
8-PIN PLASTIC DIP, SO-8
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.
AD PPLICATIONS
The INA128/INA129 is laser trimmed for very low offset
BRIDGE AMPLIFIER
voltage (50µV),
drift (0.5µV/°C) and high
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THERMOCOUPLE AMPLIFIER
RTD SENSOR AMPLIFIER
MEDICAL INSTRUMENTATION
DATA ACQUISITION
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.
V+
7
INA128:
Ω
RG
50k
INA128, INA129
G = 1 +
−
VIN
2
1
Over-Voltage
Protection
A1
INA129:
Ω
Ω
40k
40k
Ω
49.4k
G = 1 +
(1)
25kΩ
RG
6
5
A3
VO
RG
8
3
(1)
25kΩ
A2
Ref
+
VIN
Over-Voltage
Protection
Ω
Ω
40k
40k
4
Ω
NOTE: (1) INA129: 24.7k
V−
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