Datasheet AD8571, AD8572, AD8574 (Analog Devices)

Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers Data Sheet AD8571/ AD8572/ AD8574 FEATURES PIN CONFIGURATIONS Low offset voltage: 1 μV NC 1 8 NC Input offset drift: 0.005 μV/°C –IN A 2 AD8571 7 V+ Rail-to-rail input and output swing TOP VIEW +IN A 3 6 OUT A (Not to Scale) 5 V/2.7 V single-supply operation V– 4 5 NC
1 -00
High gain: 145 dB typical
04
NC = NO CONNECT
11 0
CMRR: 140 dB typical
Figure 1. 8-Lead MSOP (RM Suffix)
PSRR: 130 dB typical NC 1 8 NC Ultralow input bias current: 10 pA typical –IN A 2 AD8571 7 V+ Low supply current: 750 μA per op amp +IN A 3 TOP VIEW 6 OUT A Overload recovery time: 50 μs (Not to Scale) V– 4 5 NC
04 0
No external capacitors required
4-
NC = NO CONNECT
10 01 Figure 2. 8-Lead SOIC (R Suffix)
APPLICATIONS OUT A 1 8 V+ Temperature sensors –IN A 2 AD8572 7 OUT B Pressure sensors TOP VIEW +IN A 3 6 –IN B
2
(Not to Scale)
00
Precision current sensing
4-
V– 4 5 +IN B
10 01
Strain gage amplifiers
Figure 3. 8-Lead TSSOP (RU Suffix)
Medical instrumentation Thermocouple amplifiers OUT A 1 8 V+ –IN A 2 AD8572 7 OUT B TOP VIEW +IN A 3 6 –IN B
5
(Not to Scale)
00 4-
GENERAL DESCRIPTION V– 4 5 +IN B
10 01 Figure 4. 8-Lead SOIC (R Suffix) This family of amplifiers has ultralow offset, drift, and bias current. The AD8571/AD8572/AD85741 are single, dual, and
OUT A 1 14 OUT D
quad amplifiers, respectively, featuring rail-to-rail input and
–IN A 2 13 –IN D
output swings. All are guaranteed to operate from 2.7 V to 5 V
+IN A 3 12 +IN D AD8574 V+ 4 11 TOP VIEW V–
single supply.
+IN B (Not to Scale) 5 10 +IN C
The AD8571/AD8572/AD8574 provide benefits previously
–IN B 6 9 –IN C
03 0
OUT B 7 8 OUT C
4- found only in expensive auto-zeroing or chopper-stabilized 10 01 amplifiers. Using Analog Devices, Inc., topology, these zero- Figure 5. 14-Lead TSSOP (RU Suffix) drift amplifiers combine low cost with high accuracy. (No
OUT A 1 14 OUT D
external capacitors are required.) Using a spread-spectrum,
–IN A 2 13 –IN D
auto-zero technique, the AD8571/AD8572/AD8574 eliminate
+IN A 3 12 +IN D AD8574
the intermodulation effects from interaction of the chopping
V+ 4 11 TOP VIEW V–
function with the signal frequency in ac applications.
+IN B (Not to Scale) 5 10 +IN C –IN B 6 9 –IN C
06 -0 With an offset voltage of only 1 μV and drift of 0.005 μV/°C, the
OUT B 7 8 OUT C
1104 0 AD8571/AD8572/AD8574 are perfectly suited for applications Figure 6. 14-Lead SOIC (R Suffix) where error sources cannot be tolerated. Position and pressure The AD8571/AD8572/AD8574 are specified for the extended sensors, medical equipment, and strain gage amplifiers benefit industrial/ automotive temperature range (−40°C to +125°C). greatly from nearly zero drift over their operating temperature The AD8571 single amplifier is available in 8-lead MSOP and range. Many more systems require the rail-to-rail input and narrow SOIC packages. The AD8572 dual amplifier is available in output swings provided by the AD8571/AD8572/AD8574. 8-lead narrow SOIC and surface-mount TSSOP packages. The AD8574 quad amplifier is available in 14-lead narrow SOIC and 1 TSSOP packages. Protected by U.S. Patent 6,130,578.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PIN CONFIGURATIONS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS 5 V ELECTRICAL CHARACTERISTICS 2.7 V ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL CHARACTERISTICS ESD CAUTION TYPICAL PERFORMANCE CHARACTERISTICS FUNCTIONAL DESCRIPTION AMPLIFIER ARCHITECTURE BASIC AUTO-ZERO AMPLIFIER THEORY AUTO-ZERO PHASE AMPLIFICATION PHASE HIGH GAIN, CMRR, AND PSRR MAXIMIZING PERFORMANCE THROUGH PROPER LAYOUT 1/f NOISE CHARACTERISTICS RANDOM AUTO-ZERO CORRECTION ELIMINATES INTERMODULATION DISTORTION BROADBAND AND EXTERNAL RESISTOR NOISE CONSIDERATIONS OUTPUT OVERDRIVE RECOVERY INPUT OVERVOLTAGE PROTECTION OUTPUT PHASE REVERSAL CAPACITIVE LOAD DRIVE POWER-UP BEHAVIOR APPLICATIONS INFORMATION 5 V PRECISION STRAIN GAGE CIRCUIT 3 V INSTRUMENTATION AMPLIFIER HIGH ACCURACY THERMOCOUPLE AMPLIFIER PRECISION CURRENT METER PRECISION VOLTAGE COMPARATOR OUTLINE DIMENSIONS ORDERING GUIDE