Digitally Programmable Instrumentation Amplifier - Analog Devices
Description
Data Sheet
FEATURES
Digitally/pin-programmable gain G = 1, 2, 4, 8, 16, 32, 64, or 128
Specified from −55°C to +125°C 50 nV/°C maximum input offset drift 10 ppm/°C maximum gain drift
Excellent dc performance 80 dB minimum CMR, G = 1 15 µV maximum input offset voltage 500 pA maximum bias current 0.
7 µV p-p noise (0.
1 Hz to 10 Hz)
Good ac performance 2.
7 MHz bandwidth, G = 1 1.
1 V/μs slew rate
Rail-to-rail output Shutdown/multiplex Extra op amp Single-supply range: 3 V to 6 V Dual-supply range: ±1.
5 V to ±3 V
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC standard)
Military temperature range (−55°C to +125°C) Controlled manufacturing baseline One assembly/test site One fabrication site Enhanced product change notification Qualification data available on request
Zero Drift, Digitally Programmable Instrumentation Amplifier AD8231-EP
FUNCTIONAL BLOCK DIAGRAM
16 A2 15 A1 14 A0 13 CS
NC 1 –INA 2 +INA 3
LOGIC IN-AMP
NC 4
AD8231-EP
OP AMP
12 +VS 11 –VS 10 OUTA 9 REF
SDN 5 +INB 6 –INB 7 OUTB 8
09707-001
Figure 1.
Table 1.
Instrumentation and Difference Amplifiers by
Category
High
Low
Performance Cost
High
Mil
Low
Digital
Voltage Grade Power Gain
AD8221
AD6231 AD628 AD620 AD6271 AD82311
AD82201
AD85531 AD629 AD621
AD8250
AD8222
AD524
AD8251
AD82241
AD526
AD85551
AD624
AD85561
AD85571
1 Rail-to-rail output.
GENERAL DESCRIPTION
The AD8231-EP is a low drift, rail-to-rail, instrumentation amplifier with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128.
The gains are programmed via digital logic or pin strapping.
The AD8231-EP is ideal for applications that require precision performance over a wide temperature range, such as industrial temperature sensing and data logging.
Because the gain setting resistors are internal, maximum gain drift is only 10 ppm/°C for gains of 1 to 32.
Because of the auto-zero input stage, maximum input offset is 15 µV and maximum input offset drift is just 50 nV/°C.
CMRR is 80 ...
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