PRELIMINARY TECHNICAL DATA Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Low Noise Operational Amplifier a AD8628 Preliminary Technical Data the AD8628 family to reduce input biasing complexity and maximize SNR. FEATURES Lowest auto-zero amplifier noise Low Offset Voltage: 5 V Input Offset Drift: 0.03 V/C Rail-to-Rail Input and Output Swing 5 V Single-Supply Operation High Gain, CMRR, and PSRR: 120 dB Very Low Input Bias Current: 100 pA Low Supply Current: 1.3 mA Overload Recovery Time: 0.2 ms No External Components Required The AD8628 family is specified for the extended industrial (-40 to +125C) temperature range. The AD8628 amplifier is available in the tiny SOT23 and the popular 8-pin narrow SOIC plastic packages. 5-Lead SOT (RT-5) AD8628 APPLICATIONS Automotive Sensors Pressure and Position Sensors Strain Gage Amplifiers Medical Instrumentation Thermocouple Amplifiers 8-Lead SO (R-8) GENERAL DESCRIPTION AD8628 This new family of amplifiers has ultra-low offset, drift and bias current. The AD8628 is a wide bandwidth auto-zero amplifier featuring rail-to-rail input and output swings and low noise. Operation is fully specified from 2.7 to 5 volts single supply (1.35V to 2.5V dual supply). The AD8628 family provides the benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. 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 AD8628 greatly reduces the digital switching noise found in most chopper stabilized amplifiers. With an offset voltage of only 1V, drift less than 0.005 V/C and noise of only 0.5uV P-P (0Hz to 10 Hz) the AD8628 is perfectly suited for applications where error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. Many systems may take advantage of the rail-to-rail input and output swings provided by REV. PrA 1/29/02 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. World Wide Web Site: http://www.analog.com Tel: 617/329-4700 (c) Analog Devices, Inc., 2002 Fax: 617/326-8703 PRELIMINARY TECHNICAL DATA AD8628 ELECTRICAL SPECIFICATIONS (@ VS=+5.0V, VCM = +2.5V, VO=+2.5V, TA=+25C unless otherwise specified.) Parameter Symbol INPUT CHARACTERISTICS Offset Voltage VOS Conditions Min Typ IB Input Offset Current IOS 5 V 30 10 100 V pA 50 1.5 200 nA pA 250 5 pA V dB -40C TA +125C -40C TA +125C Input Voltage Range Common-Mode Rejection Ratio CMRR VCM = 0V to 5V -40C TA +125C 115 130 dB Large Signal Voltage Gain (Note 1) AVO RL = 10 k, Vo=0.3 to 4.7V 125 145 dB -40C TA +125C 120 Offset Voltage Drift VOS/T OUTPUT CHARACTERISTICS Output Voltage High VOH Output Voltage Low VOL 0 120 Units 1 -40C TA +125C Input Bias Current Max -40C TA +125C Output Current POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Overload Recovery Time Gain Bandwidth Product NOISE PERFORMANCE Voltage Noise Voltage Noise Voltage Noise Density Current Noise Density 135 0.002 dB 0.03 V/C RL = 100k to Ground 4.99 4.996 V -40C TA +125C 4.99 4.995 V V RL = 10k to Ground 4.95 4.98 -40C TA +125C 4.95 4.97 RL = 100k to V+ V 1 10 mV -40C TA +125C 2 10 mV RL = 10 k to V+ 10 20 mV 15 50 20 mV mA -40C TA +125C Short Circuit Limit 140 ISC 25 -40C TA +125C 40 30 mA mA -40C TA +125C 15 mA dB IO PSRR VS = 2.7V to 5.5V 120 130 115 ISY -40C TA +125C VO = 0V 130 1.3 1.5 dB mA -40C TA +125C 1.6 1.8 mA RL =10 k 0.8 0.05 2.5 0.2 V/s ms MHz SR GBP en p-p en p-p 0.1 to 10 Hz 0.1 to 1.0 Hz en in f = 1 kHz f=10 Hz 0.5 0.16 22 5 Vp-p Vp-p nV/Hz fA/Hz Note 1: Gain testing is highly dependent upon test bandwidth. -2- REV. PrA 1/29/02 PRELIMINARY TECHNICAL DATA AD8628 ELECTRICAL SPECIFICATIONS (@ VS=+2.7V, VCM = +1.35 V, VO=1.4V, TA=+25C unless otherwise specified.) Parameter Symbol INPUT CHARACTERISTICS Offset Voltage AD8628 VOS Conditions Min Typ IB Input Offset Current IOS -40C TA +125C 5 V 30 10 100 V pA 1.0 50 1.5 200 nA pA 250 5 pA V dB -40C TA +125C Input Voltage Range Common-Mode Rejection Ratio CMRR VCM = 0 to 2.9V -40C TA +125C 110 120 dB Large Signal Voltage Gain AVO RL = 10 k, Vo=0.3 to 4.7V 110 140 dB -40C TA +125C 105 Offset Voltage Drift VOS/T OUTPUT CHARACTERISTICS Output Voltage High VOH Output Voltage Low VOL 0 115 Units 1 -40C TA +125C Input Bias Current Max -40C TA +125C Output Current POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Overload Recovery Time Gain Bandwidth Product NOISE PERFORMANCE Voltage Noise Voltage Noise Density Current Noise Density REV. PrA 1/29/02 130 0.002 dB 0.03 V/C RL = 100k to Ground 2.68 2.695 V -40C TA +125C 2.68 2.695 V V RL = 10k to Ground 2.67 2.68 -40C TA +125C 2.67 2.675 RL = 100k to V+ V 1 10 mV -40C TA +125C 2 10 mV RL = 10 k to V+ 10 20 mV 15 15 20 mV mA -40C TA +125C Short Circuit Limit 130 ISC 10 -40C TA +125C 10 10 mA mA -40C TA +125C 5 mA dB IO PSRR VS = 2.7V to 5.5 V 120 130 115 ISY -40C TA +125C VO = 0V 130 1.1 1.4 dB mA -40C TA +125C 1.3 1.6 mA RL =10 k 1 0.05 2 V/s ms MHz en p-p 0.1 to 10 Hz 0.75 Vp-p en in f = 1 kHz f=10 Hz SR GBP -3- 33 5 nV/Hz fA/Hz PRELIMINARY TECHNICAL DATA AD8628 ABSOLUTE MAXIMUM RATINGS Supply Voltage ..........................................................................+6V Input Voltage......................................................GND to Vs + 0.3V Differential Input Voltage1 .....................................................5.0V Output Short-Circuit Duration to Gnd...............................Indefinite Storage Temperature Range RT, R Package ............................................... -65C to +150C Operating Temperature Range AD8628 ......................................................... -40C to +125C Junction Temperature Range RT, R Package ............................................... -65C to +150C Lead Temperature Range (Soldering, 10 sec).......................+300C Package Type JA2 JC Units 5-Pin SOT23 (RT) 8-Pin SOIC (R) 158 43 C/W C/W NOTES 1 Differential input voltage is limited to 5.0 volts or the supply voltage, whichever is less. 2 is specified for the worst case conditions, i.e., is specified for device in socket JA JA for P-DIP packages; JAis specified for device soldered in circuit board for SOIC and TSSOP packages. ORDERING GUIDE -4- Model Temperature Range Package Description Package Option AD8628ART AD8628AR -40C to +125C -40C to +125C 5-Pin SOT23 8-Pin SOIC RT-5 SO-8 REV. PrA 1/29/02