ANALOG DEVICES AD8698

Dual Precision, Rail-to-Rail Output Operational Amplifier AD8698 FEATURES CONNECTION DIAGRAMS Low offset voltage: 100 µV max Low offset voltage drift: 2 µV/°C max 8-Lead SOIC 8-Lead MSOP Low input bias current: 700 pA max (R-8) (RM-8) Low noise: 8 nV/√Hz 1 8 1 8 OUT A V+ OUT A V+ High common-mode rejection: 118 dB min AD8698 AD8698 –IN A 2 7 OUT B –IN A 2 7 OUT B Wide operating temperature: −40°C to +85°C +IN A 3 6 –IN B +IN A 3 6 –IN B TOP VIEW TOP VIEW No phase reversal (Not to Scale) (Not to Scale) V– 4 5 +IN B V– 4 5 +IN B Figure 1. APPLICATIONS Photodiode amplifier Sensors and controls Multipole filters Integrator GENERAL DESCRIPTION The AD8698 is a high precision, rail-to-rail output, low noise, low input bias current operational amplifier. Offset voltage is a respectable 100 µV max and drift over temperature is below 2 µV/°C, eliminating the need for manual offset trimming. The AD8698 is ideal for high impedance sensors, minimizing offset errors due to input bias and offset currents. The rail-to-rail output maximizes dynamic range in a variety of applications, such as photodiode amplifiers, DAC I/V amplifiers, filters, and ADC input amplifiers. The AD8698 dual amplifiers are offered in 8-lead MSOP and narrow 8-lead SOIC packages. The MSOP version is available in tape and reel only. Rev. 0 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Specifications subject to change without notice. No license is granted by implication Tel: 781.329.4700 www.analog.com or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. 04807-0-069 04807-0-070 AD8698 TABLE OF CONTENTS Specifications .................................................................................... 3 Instrumentation Amplifier ....................................................... 15 Absolute Maximum Ratings ........................................................... 5 Composite Amplifier................................................................. 15 Thermal Resistance ...................................................................... 5 Low Noise Applications ............................................................ 16 ESD Caution.................................................................................. 5 Driving ADCs............................................................................. 16 Typical Performance Characteristics............................................. 6 Using the AD8698 in Active Filter Designs ........................... 16 Applications .................................................................................... 14 Outline Dimensions....................................................................... 17 Input Overvoltage Protection................................................... 14 Ordering Guide .......................................................................... 17 Driving Capacitive Loads.......................................................... 14 REVISION HISTORY 4/04—Revision 0: Initial Version Rev. 0 | Page 2 of 20 AD8698 SPECIFICATIONS o VS = ±15 V, VCM = 0 V (@TA = 25 C, unless otherwise noted.) Table 1. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage V 20 100 µV OS −40°C < T < +85°C 300 µV A Offset Voltage Drift 0.6 2 µV/°C ∆V /∆T −40°C < TA < +85°C OS Input Bias Current I 700 pA B −40°C < TA < +85°C 1500 pA Input Offset Current IOS 700 pA 1500 pA −40°C < TA < +85°C Input Voltage Range IVR −40°C < TA < +85°C −13.5V 13.5 V Common-Mode Rejection Ratio CMRR V = ±13.5 V 118 132 dB CM Large Signal Voltage Gain AVO RL = 2 kΩ, VO = ±13.5 V 900 1450 V/mV Input Capacitance CDIFF 6.5 pF C 4.6 pF CM OUTPUT CHARACTERISTICS Output Voltage Swing (Ref. to GND) VOH IL = 1 mA, −40°C < TA < +85°C 14.85 14.93 V V 14.6 14.8 V OH IL = 5 mA, −40°C < TA < +85°C (Ref. to GND) VOL IL = 1 mA, −40°C < TA < +85°C −14.93 −14.6 V V V OL IL = 5 mA, −40°C < TA < +85°C −14.82 −14.5 POWER SUPPLY Power Supply Rejection Ratio PSRR ±2.5 V < VS < ±15 V 114 132 dB Supply Current I V = 0 V 2.8 3.2 mA SY O 3.8 mA −40°C < TA < +85°C Supply Voltage VS −40°C < T < +85°C ±2.5 ±15 V A DYNAMIC PERFORMANCE Slew Rate SR R = 2 kΩ 0.4 V/µs L Gain Bandwidth Product GBP 1 MHz Phase Margin ØO 60 Degrees NOISE PERFORMANCE Input Noise Voltage en p-p 0.1 Hz < f < 10 Hz 0.6 µV p-p Input Voltage Noise Density en f = 10 Hz 15 nV/√Hz Input Voltage Noise Density en f = 1 kHz 8 nV/√Hz Current Noise Density in f = 1 kHz 0.2 pA/√Hz Rev. 0 | Page 3 of 20 AD8698 o V = ±2.5 V, V = 0 V (@T = 25 C, unless otherwise noted.) S CM A Table 2. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS 20 100 µV −40°C < TA < +85°C 300 µV Offset Voltage Drift 2 µV/°C ∆VOS/∆T −40°C < TA < +85°C Input Bias Current IB 700 pA 1500 pA −40°C < TA < +85°C Input Offset Current IOS 700 pA −40°C < T < +85°C 1500 pA A Input Voltage Range IVR −40°C < TA < +85°C −1.5 +1.5 V Common-Mode Rejection Ratio CMRR VCM = ±13.5 V 105 120 dB Large Signal Voltage Gain A 600 1200 V/mV VO RL = 2 kΩ, VO = ±13.5 V Input Capacitance CDIFF 6.4 pF C 4.6 pF CM OUTPUT CHARACTERISTICS Output Voltage Swing (Ref. to GND) V 2.35 2.44 V OH IL = 1 mA, −40°C < TA < +85°C VOH I = 5 mA, −40°C < T < +85°C 2.1 2.29 V L A (Ref. to GND) VOL IL = 1 mA, −40°C < TA < +85°C −2.43 −2.2 V VOL IL = 5 mA, TA = 25°C −2.15 −1.9 V IL= 5mA, −40°C