INA128_15 Datasheet, PDF (1/29 Pages) Texas Instruments – INA12x Precision, Low Power Instrumentation Amplifiers

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INA128, INA129
SBOS051C – OCTOBER 1995 – REVISED OCTOBER 2015
INA12x Precision, Low Power Instrumentation Amplifiers
1 Features
•1 Low Offset Voltage: 50 μV Maximum
• Low Drift: 0.5 μV/°C Maximum
• Low Input Bias Current: 5 nA Maximum
• High CMR: 120 dB minimum
• Inputs Protected to ±40 V
• Wide Supply Range: ±2.25 V to ±18 V
• Low Quiescent Current: 700 μA
• 8-PIN Plastic Dip, SO-8
2 Applications
• Bridge Amplifier
• Thermocouple Amplifier
• RTD Sensor Amplifier
• Medical Instrumentation
• Data Acquisition
3 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 these amplifiers ideal for a wide range of
applications. Current-feedback input circuitry provides
wide bandwidth even at high gain (200 kHz 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 INA12x is laser-trimmed for very low offset
voltage (50 μV), drift (0.5 μV/°C) and high common-
mode rejection (120 dB at G ≥ 100). The INA12x
operates with power supplies as low as ±2.25 V, and
quiescent current is only 700 μA, ideal for battery-
operated systems. Internal input protection can
withstand up to ±40 V without damage.
The INA12x 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA128
INA129
SOIC (8)
PDIP (8)
3.91 mm × 4.9 mm
6.35 mm × 9.81 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
−
V_IN
2 _Over-Voltage
Protection
1
R_G
8
+
3 _Over-Voltage
V_IN
Protection Ω
Simplified Schematic
V+
7
INA128, INA129
A₁
25k ⁽¹⁾
40kΩ
25kΩ(1)
A₂
40kΩ
40kΩ
6
A₃
5
40kΩ
INA128:
G = 1 + ^50kΩ
R_G
INA129:
G = 1 + ^49.4kΩ
R_G
V_O
Ref
4
NOTE: (1) INA129: 24.7kΩ
V−
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.