INA188_15 Datasheet, PDF (1/37 Pages) Texas Instruments – INA188 Precision, Zero-Drift, Rail-to-Rail Out, High-Voltage Instrumentation Amplifier

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
INA188
SBOS632 – SEPTEMBER 2015
INA188
Precision, Zero-Drift, Rail-to-Rail Out, High-Voltage Instrumentation Amplifier
1 Features
•1 Excellent DC Performance:
– Low Input Offset Voltage: 55 μV (max)
– Low Input Offset Drift: 0.2 μV/°C (max)
– High CMRR: 104 dB, G ≥ 10 (min)
• Low Input Noise:
– 12 nV/√Hz at 1 kHz
– 0.25 μV_PP (0.1 Hz to 10 Hz)
• Wide Supply Range:
– Single Supply: 4 V to 36 V
– Dual Supply: ±2 V to ±18 V
• Gain Set with a Single External Resistor:
– Gain Equation: G = 1 + (50 kΩ / R_G)
– Gain Error: 0.007%, G = 1
– Gain Drift: 5 ppm/°C (max) G = 1
• Input Voltage: (V–) + 0.1 V to (V+) – 1.5 V
• RFI-Filtered Inputs
• Rail-to-Rail Output
• Low Quiescent Current: 1.4 mA
• Operating Temperature: –55°C to +150°C
• SOIC-8 and DFN-8 Packages
2 Applications
• Bridge Amplifiers
• ECG Amplifiers
• Pressure Sensors
• Medical Instrumentation
• Portable Instrumentation
• Weigh Scales
• Thermocouple Amplifiers
• RTD Sensor Amplifiers
• Data Acquisition
3 Description
The INA188 is a precision instrumentation amplifier
that uses TI proprietary auto-zeroing techniques to
achieve low offset voltage, near-zero offset and gain
drift, excellent linearity, and exceptionally low-noise
density (12 nV/√Hz) that extends down to dc.
The INA188 is optimized to provide excellent
common-mode rejection of greater than 104 dB (G ≥
10). Superior common-mode and supply rejection
supports high-resolution, precise measurement
applications. The versatile three op-amp design offers
a rail-to-rail output, low-voltage operation from a 4-V
single supply as well as dual supplies up to ±18 V,
and a wide, high-impedance input range. These
specifications make this device ideal for universal
signal measurement and sensor conditioning (such
as temperature or bridge applications).
A single external resistor sets any gain from 1 to
1000. The INA188 is designed to use an industry-
standard gain equation: G = 1 + (50 kΩ / R_G). The
reference pin can be used for level-shifting in single-
supply operation or for an offset calibration.
The INA188 is specified over the temperature range
of –40°C to +125°C .
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
INA188
INA188
SOIC (8)
WSON (8)⁽²⁾
4.90 mm × 3.91 mm
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
(2) The DRJ package (WSON-8) is a preview device.
Simplified Schematic
V+
VIN-
RG
RFI Filter Inputs
+
A1
RFI Filtered Inputs
25 k 
25 k 
20 k 
20 k 
A3
+
VOUT
RFI Filtered Inputs
A2
VIN+
RFI Filtered Inputs
+
20 k 
20 k 
REF
V_OUT
V-
 V_IN  V_IN  u G  V_REF
G 1 ^{50 k:}
R_G
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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.