Datasheet AD8231-EP (Analog Devices)

Zero Drift, Digital y Programmable Instrumentation Amplifier Data Sheet AD8231-EP FEATURES FUNCTIONAL BLOCK DIAGRAM Digitally/pin-programmable gain A2 A1 A0 CS G = 1, 2, 4, 8, 16, 32, 64, or 128 16 15 14 13 Specified from −55°C to +125°C 50 nV/°C maximum input offset drift NC 1 12 +VS 10 ppm/°C maximum gain drift LOGIC 11 Excellent dc performance –INA 2 –VS 80 dB minimum CMR, G = 1 IN-AMP +INA 3 10 OUTA 15 µV maximum input offset voltage 500 pA maximum bias current NC 4 9 REF 0.7 µV p-p noise (0.1 Hz to 10 Hz) OP AD8231-EP Good ac performance AMP 2.7 MHz bandwidth, G = 1 5 6 7 8 1.1 V/μs slew rate
001
NB TB Rail-to-rail output SDN +INB –I OU
09707-
Shutdown/multiplex
Figure 1.
Extra op amp Table 1. Instrumentation and Difference Amplifiers by Single-supply range: 3 V to 6 V Category Dual-supply range: ±1.5 V to ±3 V High Low High Mil Low Digital ENHANCED PRODUCT FEATURES Performance Cost Voltage Grade Power Gain
AD8221 AD6231 AD628 AD620 AD6271 AD82311
Supports defense and aerospace applications (AQEC
AD82201 AD85531 AD629 AD621 AD8250
standard)
AD8222 AD524 AD8251
Military temperature range (−55°C to +125°C)
AD82241 AD526 AD85551
Controlled manufacturing baseline
AD624 AD85561
One assembly/test site
AD85571
One fabrication site
1
Enhanced product change notification
Rail-to-rail output.
Qualification data available on request GENERAL DESCRIPTION
The AD8231-EP is a low drift, rail-to-rail, instrumentation The AD8231-EP also includes an uncommitted op amp that can amplifier with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, be used for additional gain, differential signal driving, or filtering. or 128. The gains are programmed via digital logic or pin Like the in-amp, the op amp has an auto-zero architecture, rail- strapping. to-rail input, and rail-to-rail output. The AD8231-EP is ideal for applications that require precision The AD8231-EP includes a shutdown feature that reduces current performance over a wide temperature range, such as industrial to a maximum of 1 µA. In shutdown, both amplifiers also have temperature sensing and data logging. Because the gain setting a high output impedance, which allows easy multiplexing of resistors are internal, maximum gain drift is only 10 ppm/°C for multiple amplifiers without additional switches. gains of 1 to 32. Because of the auto-zero input stage, maximum The AD8231-EP is specified over the military temperature input offset is 15 µV and maximum input offset drift is just range of −55°C to +125°C. It is available in a 4 mm × 4 mm 16- 50 nV/°C. CMRR is 80 dB for G = 1, increasing to 110 dB at lead LFCSP. higher gains. Additional application and technical information can be found in the AD8231 data sheet.
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Document Outline FEATURES ENHANCED PRODUCT FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE MAXIMUM POWER DISSIPATION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS INSTRUMENTATION AMPLIFIER PERFORMANCE CURVES OPERATIONAL AMPLIFIER PERFORMANCE CURVES PERFORMANCE CURVES VALID FOR BOTH AMPLIFIERS OUTLINE DIMENSIONS ORDERING GUIDE