INA149-EP Datasheet, PDF (1/26 Pages) Texas Instruments – HIGH COMMON-MODE VOLTAGE DIFFERENCE AMPLIFIER

INA149-EP
www.ti.com
SBOS608A – MARCH 2012 – REVISED APRIL 2012
HIGH COMMON-MODE VOLTAGE DIFFERENCE AMPLIFIER
FEATURES
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•2 Common-Mode Voltage Range: ±275 V
• Minimum CMRR: 84 dB from –55°C to +125°C
• DC Specifications:
– Maximum Offset Voltage: 3500 μV
– Maximum Gain Error: 0.047%
– Maximum Gain Nonlinearity: 0.001% FSR at
25°C
• AC Performance:
– Bandwidth: 500 kHz
– Typical Slew Rate: 5 V/μs
• Wide Supply Range: ±2.0 V to ±18 V
– Maximum Quiescent Current: 1100 μA
– Output Swing on ±15-V Supplies: ±13.5 V
• Input Protection:
– Common-Mode: ±500 V
– Differential: ±500 V
APPLICATIONS
• High-Voltage Current Sensing
• Battery Cell Voltage Monitoring
• Power-Supply Current Monitoring
• Motor Controls
• Replacement for Isolation Circuits
SUPPORTS DEFENSE, AEROSPACE,
AND MEDICAL APPLICATIONS
• Controlled Baseline
• One Assembly/Test Site
• One Fabrication Site
• Available in Military (–55°C/125°C)
Temperature Range⁽¹⁾
• Extended Product Life Cycle
• Extended Product-Change Notification
• Product Traceability
120
110
100
90
80
70
60
50
40
10
INA149
Competitor A
100
1k
10k
Frequency (Hz)
100k
(1) Additional temperature ranges available - contact factory
DESCRIPTION
The INA149 is a precision unity-gain difference amplifier with a very high input common-mode voltage range. It is
a single, monolithic device that consists of a precision op amp and an integrated thin-film resistor network. The
INA149 can accurately measure small differential voltages in the presence of common-mode signals up to
±275 V. The INA149 inputs are protected from momentary common-mode or differential overloads of up to
500 V.
In many applications, where galvanic isolation in not required, the INA149 can replace isolation amplifiers. This
ability can eliminate costly isolated input side power supplies and the associated ripple, noise, and quiescent
current. The excellent 0.0005% nonlinearity and 500-kHz bandwidth of the INA149 are superior to those of
conventional isolation amplifiers.
The INA149 is pin-compatible with the INA117 and INA148 type high common-mode voltage amplifiers and
offers improved performance over both devices. The INA149 is available in the SOIC-8 package with operation
specified over the military temperature range of –55°C to +125°C.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated