INA128
INA129
SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005
Precision, Low Power
INSTRUMENTATION AMPLIFIERS
FEATURES
D
D
D
D
D
D
D
D
D
D
D
D
D
LOW OFFSET VOLTAGE: 50µV max
LOW DRIFT: 0.5µV/5C max
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
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.
V+
7
INA128:
INA128, INA129
Over-Voltage
Protection
APPLICATIONS
BRIDGE AMPLIFIER
THERMOCOUPLE AMPLIFIER
RTD SENSOR AMPLIFIER
MEDICAL INSTRUMENTATION
DATA ACQUISITION
−
V
IN
2
G=1+
INA129:
G=1+
6
50kΩ
R
G
A
1
40kΩ
1
25kΩ(1)
A
3
8
25kΩ(1)
A
2
40kΩ
4
V
−
40kΩ
5
40kΩ
49.4kΩ
R
G
R
G
V
O
+
V
IN
3
Over-Voltage
Protection
Ref
NOTE: (1) INA129: 24.7kΩ
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semiconductor products and disclaimers thereto appears at the end of this data sheet.
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PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright
1995−2005, Texas Instruments Incorporated
www.ti.com
TI [ TEXAS INSTRUMENTS ]
