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16V Auto-Zero, Rail-to-Rail Output, Precision Amplifiers
Preliminary Technical Data
FEATURES
Low Offset Voltage: 10 V max. Offset Drift: 0.08 V/C Rail-to-Rail Output 16V Single or 8V Dual Supply Operation High Gain and CMRR: 140dB High PSRR: 140 dB Very Low Input Bias Current: 100 pA Low Supply Current: 1.4 mA/amp
AD8638
PIN CONFIGURATIONS
5- Lead SOT-23 (RJ-5 Suffix)
OUT V+IN
8- Lead SOIC (R-8 Suffix)
V+ NC -IN +IN -IN V-
1
5
AD8638
1
8
AD8638
NC V+ OUT NC
APPLICATIONS
Pressure and Position Sensors Strain Gage Amplifiers Medical Instrumentation Thermocouple Amplifiers Automotive Sensors Precision References Precision Current Sources
3
4
4
5
NC = NO CONNECT
NC = NO CONNECT
GENERAL DESCRIPTION
The AD8638 is a wide bandwidth auto-zero amplifiers featuring rail-to-rail output swing while operating from 5 V to 16 V single supply or +/-2.5 V to 8V dual supplies. Using Analog Devices' new topology these zero-drift amplifiers combine low cost, with high accuracy and low noise. No external capacitors are required. In addition, the AD8638 family greatly reduces the digital switching noise often found in chopper-stabilized amplifiers. With an offset voltage of 10 V, offset drift less than 0.08 V/C and noise of only 1.5 Vp-p (0 Hz to 10 Hz), the AD8638 family is perfectly suited for applications where error sources must be minimized. Position and pressure sensors, thermocouple and thermopile detectors, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. The AD8638 family is specified for the extended industrial (-40 to +125C) temperature range. The AD8638 is available in SOT-23 and SOIC.
Rev. PrA
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2007 Analog Devices, Inc. All rights reserved.
AD8638
Preliminary Data Sheet
ELECTRICAL CHARACTERISTICS (@ VS =16V, VCM = Vs/2, TA =+25C unless otherwise specified.)
Parameter INPUT CHARACTERISTICS Offset Voltage VOS 25C -40< TA < +125C 25C -40< TA < +125C -40< TA < +125C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain (Note 1) Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High CMRR AVO -40< TA < +125C VCM = -5V to +5V -40< TA < +125C RL = 10 k,VO= -5 to +5V -40< TA < +125C 3 10 20 100 250 80 150 VS - 2 140 130 130 130 0.004 15.8 15.9 15.7 15.95 15.95 100 170 30 70 45 40 30 0.08 V V pA pA pA pA V dB dB dB dB V/C V V V V mV mV mV mV mA mA mA mA dB dB mA mA V/s s MHz V p-p nV/Hz fA/Hz Symbol Conditions A Grade Min Units Typ Max
Input Bias Current Input Offset Current
IB
B
20 40
IOS
0
120 120 130 115
VOS/T -40< TA < +125C VOH RL = 2 k -40C to +125C RL = 10K -40C to +125C RL = 2 k -40C to +125C RL = 10K -40C to +125C -40C to +125C
Output Voltage Low
VOL
50
Short Circuit Limit Output Current POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Overlay Recovery Time Gain Bandwidth Product NOISE PERFORMANCE Voltage Noise Voltage Noise Density Current Noise Density
ISC IOUT -40C to +125C PSRR ISY VS = 5V to 16V -40C to +125C VO = 0V -40< TA < +125C RL =10 k 110
140 1.0 1.2 1.4
SR GBP en p-p en in
2 50 1.5
f=0.1 to 10 Hz f=1kHz f=10Hz
1.5 59 tbd
Note 1: Gain testing is highly dependent upon test bandwidth
Rev. PrA | Page 2 of 4
AD8638
Preliminary Data Sheet
ELECTRICAL CHARACTERISTICS (@ VS =5V, VCM = Vs/2, TA =+25C unless otherwise specified.)
Parameter INPUT CHARACTERISTICS Offset Voltage VOS -40< TA < +125C Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain (Note 1) Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High CMRR AVO IB
B
Symbol
Conditions
A Grade Min
Units Typ Max
3
10 20 40 120 40 60 VS - 2
V V pA pA pA pA V dB dB dB dB
15 -40< TA < +125C 30 -40< TA < +125C -40< TA < +125C VCM = -5V to +5V -40< TA < +125C RL = 10 k,VO= -5 to +5V -40< TA < +125C
IOS
0
120 120 130 120 135 130 140 140 0.004 4.9 4.95 4.95 4.9 4.99 4.99 25 40 7 15 20 15 tbd
VOS/T -40< TA < +125C VOH RL = 2 k -40C to +125C RL = 10 k -40C to +125C RL = 2 k -40C to +125C RL = 10 k -40C to +125C -40C to +125C
0.08
V/C V V V V mV mV mV mV mA mA mA mA dB dB mA mA V/s s MHz V p-p nV/Hz fA/Hz
Output Voltage Low
VOL
14
Short Circuit Limit Output Current POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Overlay Recovery Time Gain Bandwidth Product NOISE PERFORMANCE Voltage Noise Voltage Noise Density Current Noise Density
ISC IOUT -40C to +125C PSRR ISY VS = 5V to 16V -40C to +125C VO = 0V -40< TA < +125C RL =10 k 110
140 0.9 1 1.2
SR GBP en p-p en in
2 50 1.3
f=0.1 to 10 Hz f=1kHz f=10Hz
1.5 59 tbd
Note 1: Gain testing is highly dependent upon test bandwidth
Rev. PrA | Page 3 of 4
AD8638
ABSOLUTE MAXIMUM RATINGS1 Supply voltage .........................................................................+16V Input Voltage ............................................................................. Vs Differential Input Voltage1 ........................................................ Vs Output Short-Circuit Duration to Gnd .............................. Indefinite Storage Temperature Range R, RM, RU Packages .....................................-65C to +150C Operating Temperature Range AD8638 .......................................................-40C to +125C Junction Temperature Range R, RT Packages..............................................-65C to +150C Lead Temperature Range (Soldering, 60 Sec) ..................... +300C Package Type 5-Lead SOT-23 (RT-5) 8-Pin SOIC (R)
Preliminary Data Sheet
JA2 230 158 JC 146 43 Units C/W C/W
NOTES
1 Differential input voltage is limited to 5V or the supply voltage whichever is less. 2 is specified for the worst case conditions, i.e., is specified for device soldered JA JA in circuit board for surface mount packages.
ORDERING GUIDE
Model AD8638ARJZ AD8638ARZ Temperature Range -40C to +125C -40C to +125C Package Description 5-Lead SOT-23 8-Lead SOIC_N Package Option RJ-5 R-8
(c)2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR06895-0-6/07(PrA)
Rev. PrA | Page 4 of 4

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