REV.PrA思念的人
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AD8571/AD8572/AD8574
大海归One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.Tel: 781/329-4700World Wide Web Site: Fax: 781/326-8703© Analog Devices, Inc., 1999
P R E L I M I N A R
T E C H N I C A
D A
T A
Zero-Drift, Single-Supply,Rail-to-Rail Input/Output Operational Amplifier PIN CONFIGURATIONS
8-Lead MSOP (RM Suffix)
8-Lead SOIC (R Suffix)
8-Lead TSSOP (RU Suffix)
8-Lead SOIC (R Suffix)
14-Lead TSSOP (RU Suffix)
14-Lead SOIC (R Suffix)
FEATURES
Patented Spread Spectrum Auto-Zeroing Technique Eliminates Aliasing of Input Signal with Digital Clock Low Offt Voltage: 1 V
Input Offt Drift: 0.005 V/؇C
Rail-to-Rail Input and Output Swing +5/+2.7 V Single-Supply Operation High Gain, CMRR, PSRR: 130 dB Ultra Low Input Bias Current: 20 pA Low Supply Current: 700 A/op amp Overload Recovery Time: 50 s No External Capacitors Required APPLICATIONS
Pressure Motion Sensing Dynamic Weigh Scales Dynamic Pressure Sensing GENERAL DESCRIPTION
This new family of amplifiers has ultra-low offt, drift and bias current. The AD8571, AD8572 and AD8574 are single, dual, and quad amplifiers featuring rail-to-rail input and output swings. All are guaranteed to operate from +2.7 V to +5 V single supply.The AD857x family provides the benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Ana-log Devices’ new topology the new zero-drift amplifiers combine low cost, with high accuracy. (No external capacitors required).Analog Devices’ patented spread spectrum auto-zeroing tech-nique eliminates the digital noi spike of chopper amplifiers and does away with signal aliasing problems.
With an offt voltage of only 1 µV and drift of 0.005 µV/°C, the AD8571 is perfectly suited for applications where error sources cannot be tolerated. Temperature, position and pressure nsors,medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. The rail-to-rail input and output swings provided by the AD857x family make both high-side and low-side nsing easy.
The AD857x family is specified for the extended industrial/automotive (–40° to +125°C) temperature range. The AD8571single is available in 8-lead MSOP and narrow 8-lead SOIC packages. The AD8572 dual amplifiers are available in 8-lead narrow SO and 8-lead TSSOP surface mount packages. The AD8574 quad is available in narrow 14-lead SOIC and 14-lead TSSOP packages.
Preliminary Technical Data
–2–REV. PrA
AD8571/AD8572/AD8574–SPECIFICATIONS
P R E L I M I N A R Y T E C H N I C A L D A
T A
ELECTRICAL CHARACTERISTICS Parameter
Symbol Conditions Min Typ Max Units INPUT CHARACTERISTICS Offt Voltage V OS 1
5µV –40°C ≤ T A ≤ +125°C 10µV Input Bias Current I B 2050pA –40°C ≤ T A ≤ +125°C 2nA Input Offt Current
I OS 1040pA –40°C ≤ T A ≤ +125°C
100pA Input Voltage Range
05
V Common-Mode Rejection Ratio CMRR V CM = 0 V to +5 V 110130dB –40°C ≤ T A ≤ +125°C
110130dB Large Signal Voltage Gain 1A VO R L = 10 k Ω , V O = +0.3 V to +4.7 V 110150dB –40°C ≤ T A ≤ +125°C 110
130dB Offt Voltage Drift ∆V OS /∆T –40°C ≤ T A ≤ +125°C
0.020.04
µV/°C Bias Current Drift ∆I B /∆T 15pA/°C Offt Current Drift
∆I OS /∆T 1pA/°C OUTPUT CHARACTERISTICS Output Voltage High
V OH
R L = 100 k Ω to GND 4.99 4.998V –40°C to +125°C 4.99 4.995V R L = 10 k Ω to GND 4.95 4.98V –40°C to +125°C 4.95
V Output Voltage Low
V OL
R L = 100 k Ω to V+110mV –40°C to +125°C 210mV R L = 10 k Ω to V+1020mV –40°C to +125°C 1520
mV Short Circuit Limit I SC ±25
±50mA –40°C to +125°C
±20mA Output Current
I O
±10mA –40°C to +125°C
±5mA POWER SUPPLY
Power Supply Rejection Ratio PSRR V S = 2.7 V to 5.5 V 110130dB –40°C ≤ T A ≤ +125°C 110
130dB Supply Current/Amplifier I SY
V O = 0 V
翠华山700800µA –40°C ≤ T A ≤ +125°C 800900
µA DYNAMIC PERFORMANCE Slew Rate
SR R L = 10 k Ω
0.8V/µs Overload Recovery Time 0.050.2
ms Gain Bandwidth Product GBP 1.5MHz NOISE PERFORMANCE Voltage Noi e n p–p 0 Hz to
10 Hz 1.3µV p–p e n p–p 0 Hz to 1 Hz 0.41µV p–p Voltage Noi Density e n f = 1 kHz 50nV/√Hz Current Noi Density
i n
f = 10 Hz
5
fA/√Hz
NOTE 1
Gain testing is highly dependent upon test bandwidth.Specifications subject to change without notice.
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(V S
= +5 V, V
CM = +0.1 V, V O = +1.4 V, T A = +25؇C unless otherwi noted)
–3–
REV. PrA AD8571/AD8572/AD8574
P R E L I M I N A R Y T E C H N I C A L D A
T A
ELECTRICAL CHARACTERISTICS Parameter
Symbol Conditions Min Typ Max Units INPUT CHARACTERISTICS Offt Voltage V OS 1
5µV –40°C ≤ T A ≤ +125°C 10µV Input Bias Current I B 2050pA –40°C ≤ T A ≤ +125°C 2nA Input Offt Current
I OS 1040pA –40°C ≤ T A ≤ +125°C
100pA Input Voltage Range
05
V Common-Mode Rejection Ratio CMRR V CM = 0 V to 2.9 V 110130dB –40°C ≤ T A ≤ +125°C
110130dB Large Signal Voltage Gain 1A VO R L = 10 k Ω , V O = +0.3 V to +4.7 V 110140dB –40°C ≤ T A ≤ +125°C 110
130dB Offt Voltage Drift ∆V OS /∆T –40°C ≤ T A ≤ +125°C
0.020.04
µV/°C Bias Current Drift ∆I B /∆T 15pA/°C Offt Current Drift
∆I OS /∆T 1pA/°C OUTPUT CHARACTERISTICS Output Voltage High
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V OH
R L = 100 k Ω to GND 2.99 2.999V –40°C to +125°C 2.99 2.998V R L = 10 k Ω to GND 2.95 2.98V –40°C to +125°C 2.95
V Output Voltage Low
V OL
R L = 100 k Ω to V+110mV –40°C to +125°C 210mV R L = 10 k Ω to V+1020
mV –40°C to +125°C 15mV Short Circuit Limit I SC ±10
±20mA –40°C to +125°C
±10mA Output Current
I O
±10mA –40°C to +125°C
±5mA POWER SUPPLY
Power Supply Rejection Ratio PSRR V S = 2.7 V to 5.5 V 110130dB –40°C ≤ T A ≤ +125°C 110
130dB Supply Current/Amplifier I SY
V O = 0 V
600700µA –40°C ≤ T A ≤ +125°C 700800
µA DYNAMIC PERFORMANCE Slew Rate
SR R L = 10 k Ω
0.5V/µs Overload Recovery Time 0.05ms Gain Bandwidth Product GBP 1MHz NOISE PERFORMANCE Voltage Noi
e n p–p 0 Hz to 10 Hz 1µV p–p Voltage Noi Density e n
f = 1 kHz 50nV/√Hz Current Noi Density
i n
f = 10 Hz
5
fA/√Hz
NOTE
Specifications subject to change without notice.
(V S
飞蚊症症状= +3.0 V, V
CM = +0.1 V, V O = +1.4 V, T A = +25؇C unless otherwi noted)
AD8571/AD8572/AD8574
–4–REV. PrA
P R E L I M I N A R Y T E C H N I C A L D A
小孩生日快乐
T A
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+6 V Input Voltage . . . . . . . . . . . . . . . . . . . . . .GND to V S + 0.3 V Differential Input Voltage 2
. . . . . . . . . . . . . . . . . . . . . .±5.0 V Output Short-Circuit Duration to GND . . . . . . . . .Indefinite Storage Temperature Range
RM, RU, and R Packages . . . . . . . . . . . .–65°C to +150°C Operating Temperature Range
AD8571A/AD8572A/AD8574A . . . . . . . .–40°C to +125°C Junction Temperature Range
RM, RU, and R Packages . . . . . . . . . . . .–65°C to +150°C Lead Temperature Range (Soldering, 60 c) . . . . . . .+300°C
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NOTES 1
Stress above tho listed under Absolute Maximum Ratings may cau perma-nent damage to the device. This is a stress rating only; functional operation of the device at the or any other conditions above tho listed in the operational ctions of this specification is not implied. Exposure to absolute maximum rating condi-tions for extended periods may affect device reliability.2
Differential input voltage is limited to ±5.0 V or the supply voltage, whichever is less.
Package Type JA 1JC Units 8-Lead MSOP (RM)19044°C/W 8-Lead TSSOP (RU)24043°C/W 8-Lead SOIC (R)
15843°C/W 14-Lead TSSOP (RU)7633°C/W 14-Lead SOIC (R)
120
36
°C/W
NOTE 1
θJA is specified for worst ca conditions, i.e., θJA is specified for device in socket for P-DIP packages, θJA is specified for device soldered in circuit board for SOIC and TSSOP packages.
CAUTION
ESD (electrostatic discharge) nsitive device. Electrostatic charges as high as 4000V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD8571/AD8572/AD8574 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
ORDERING GUIDE
Temperature Package Package Model
Range Description Option AD8571ARM –40°C to +125°C 8-Lead MSOP RM-8AD8571AR –40°C to +125°C 8-Lead SOIC
SO-8
AD8572ARU –40°C to +125°C 8-Lead TSSOP RU-8AD8572AR –40°C to +125°C 8-Lead SOIC SO-8AD8574ARU –40°C to +125°C 14-Lead TSSOP RU-14AD8574AR
–40°C to +125°C
14-Lead SOIC
SO-14
