16V Auto-Zero, Rail-to-Rail Output, Precision Amplifiers Preliminary Technical Data AD8638 FEATURES Low Offset Voltage: 10 μV max. Offset Drift: 0.08 μV/°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 APPLICATIONS Pressure and Position Sensors Strain Gage Amplifiers Medical Instrumentation Thermocouple Amplifiers Automotive Sensors Precision References Precision Current Sources PIN CONFIGURATIONS 5- Lead SOT-23 (RJ-5 Suffix) OUT 1 5 8- Lead SOIC (R-8 Suffix) V+ NC 1 8 -IN V+IN AD8638 3 4 NC = NO CONNECT V+ AD8638 +IN -IN V- NC 4 5 OUT NC 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 µV, offset drift less than 0.08 µV/°C and noise of only 1.5 µVp-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 +125°C) 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 ©2007 Analog Devices, Inc. All rights reserved. AD8638 Preliminary Data Sheet ELECTRICAL CHARACTERISTICS (@ VS =16V, VCM = Vs/2, TA =+25°C unless otherwise specified.) Parameter Symbol Conditions A Grade Min Units Typ Max 10 20 µV µV INPUT CHARACTERISTICS Offset Voltage VOS 25°C -40°< TA < +125°C 3 Input Bias Current IB 25°C -40°< TA < +125°C 20 100 250 pA pA Input Offset Current IOS 40 80 150 pA pA B -40°< TA < +125°C Input Voltage Range 120 120 140 130 dB dB RL = 10 kΩ,VO= -5 to +5V -40°< TA < +125°C 130 115 130 130 dB dB CMRR Large Signal Voltage Gain (Note 1) AVO Offset Voltage Drift ΔVOS/ΔT -40°< TA < +125°C OUTPUT CHARACTERISTICS Output Voltage High VOH Output Voltage Low VOL Short Circuit Limit ISC Output Current IOUT 0 -40°< TA < +125°C VCM = -5V to +5V -40°< TA < +125°C Common-Mode Rejection Ratio RL = 2 kΩ -40°C to +125°C RL = 10KΩ -40°C to +125°C RL = 2 kΩ -40°C to +125°C RL = 10KΩ -40°C to +125°C VS - 2 0.004 0.08 15.8 15.9 -40°C to +125°C 15.7 15.95 15.95 100 170 30 70 ±45 40 ±30 50 -40°C to +125°C POWER SUPPLY Power Supply Rejection Ratio PSRR Supply Current/Amplifier ISY DYNAMIC PERFORMANCE Slew Rate SR Overlay Recovery Time Gain Bandwidth Product NOISE PERFORMANCE Voltage Noise VS = 5V to 16V -40°C to +125°C VO = 0V -40°< TA < +125°C RL =10 kΩ GBP 110 140 1.0 1.2 1.4 V µV/°C V V V V mV mV mV mV mA mA mA mA dB dB mA mA 2 V/μs 50 1.5 μs MHz en p-p f=0.1 to 10 Hz 1.5 Voltage Noise Density en f=1kHz 59 µV p-p nV/√Hz Current Noise Density in f=10Hz tbd fA/√Hz 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 =+25°C unless otherwise specified.) Parameter Symbol Conditions A Grade Min Units Typ Max 3 10 20 µV µV 15 40 120 pA pA 30 40 60 pA pA INPUT CHARACTERISTICS Offset Voltage VOS -40°< TA < +125°C Input Bias Current IB B -40°< TA < +125°C Input Offset Current IOS -40°< TA < +125°C Input Voltage Range 120 120 135 130 dB dB RL = 10 kΩ,VO= -5 to +5V -40°< TA < +125°C 130 120 140 140 dB dB CMRR Large Signal Voltage Gain (Note 1) AVO Offset Voltage Drift ΔVOS/ΔT -40°< TA < +125°C OUTPUT CHARACTERISTICS Output Voltage High VOH Output Voltage Low VOL Short Circuit Limit ISC Output Current IOUT 0 -40°< TA < +125°C VCM = -5V to +5V -40°< TA < +125°C Common-Mode Rejection Ratio RL = 2 kΩ -40°C to +125°C RL = 10 kΩ -40°C to +125°C RL = 2 kΩ -40°C to +125°C RL = 10 kΩ -40°C to +125°C VS - 2 0.004 4.9 4.95 -40°C to +125°C 4.95 4.9 4.99 4.99 25 40 7 15 ±20 15 ±tbd 0.08 14 -40°C to +125°C POWER SUPPLY Power Supply Rejection Ratio PSRR Supply Current/Amplifier ISY DYNAMIC PERFORMANCE Slew Rate SR Overlay Recovery Time Gain Bandwidth Product NOISE PERFORMANCE Voltage Noise VS = 5V to 16V -40°C to +125°C VO = 0V -40°< TA < +125°C RL =10 kΩ GBP 110 140 0.9 1 1.2 V µV/°C V V V V mV mV mV mV mA mA mA mA dB dB mA mA 2 V/μs 50 1.3 μs MHz en p-p f=0.1 to 10 Hz 1.5 Voltage Noise Density en f=1kHz 59 µV p-p nV/√Hz Current Noise Density in f=10Hz tbd fA/√Hz Note 1: Gain testing is highly dependent upon test bandwidth Rev. PrA | Page 3 of 4 AD8638 Preliminary Data Sheet 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 .....................................-65°C to +150°C Operating Temperature Range AD8638 .......................................................-40°C to +125°C Junction Temperature Range R, RT Packages..............................................-65°C to +150°C Lead Temperature Range (Soldering, 60 Sec) ..................... +300°C Package Type θJA2 θJC Units 5-Lead SOT-23 (RT-5) 8-Pin SOIC (R) 230 158 146 43 °C/W °C/W NOTES 1 Differential input voltage is limited to ±5V or the supply voltage whichever is less. 2 θ is specified for the worst case conditions, i.e., θ is specified for device soldered JA JA in circuit board for surface mount packages. ORDERING GUIDE Model AD8638ARJZ AD8638ARZ Temperature Range -40°C to +125°C -40°C to +125°C Package Description 5-Lead SOT-23 8-Lead SOIC_N ©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 Package Option RJ-5 R-8