G = 0.2, Level Translation, 16-Bit ADC Driver Data Sheet AD8275 FEATURES PIN CONFIGURATION Translates 10 V to +4 V REF1 1 8 REF2 AD8275 IN 2 7 +V Drives 16-bit SAR ADCs S TOP VIEW +IN 3 6 OUT Small MSOP package (Not to Scale) V 4 5 SENSE S Input overvoltage: +40 V to 35 V (V = 5 V) S Fast settling time: 450 ns to 0.001% Figure 1. Rail-to-rail output TYPICAL APPLICATION Wide supply operation: +3.3 V to +15 V +5V High CMRR: 80 dB 0.1F 0.1F Low gain drift: 1 ppm/C 7 +4.048V Low offset drift: 2.5 V/C +V S +2.048V +10V 50k 10k +0.048V 2 5 IN APPLICATIONS SENSE 33 VDD IN+ OUT Level translator 6 AD7685 2.7nF IN ADC driver REF GND 50k 20k Instrumentation amplifier building block VIN 3 8 10V REF2 +IN Automated test equipment 20k VREF 1 4.096V 10F REF1 V S AD8275 4 Figure 2. Translating 10 V to 4.096 V ADC Full Scale GENERAL DESCRIPTION The AD8275 is a G = 0.2 difference amplifier that can be used The AD8275 can be used as an analog front end, or it can follow to translate 10 V signals to a +4 V level. It solves the problem buffers to level translate high voltages to a voltage range accepted typically encountered in industrial and instrumentation applic- by the ADC. In addition, the AD8275 can be configured for ations where 10 V signals must be interfaced to a single-supply differential outputs if used with a differential ADC. 4 V or 5 V ADC. The AD8275 interfaces the two signal levels, The AD8275 is available in a space-saving, 8-lead MSOP simplifying design. and is specified for performance over the 40C to +85C The AD8275 has fast settling time of 450 ns and low distortion, temperature range. making it suitable for driving medium speed successive approx- Table 1. Difference Amplifiers by Category imation (SAR) ADCs. Its wide input voltage range and rail-to- Single-Supply rail outputs make it an easy to use building block. Single-supply Low Distortion High Voltage Current Sense operation reduces the power consumption of the amplifier and AD8270 AD628 AD8202 helps to protect the ADC from overdrive conditions. AD8273 AD629 AD8203 Internal, matched, precision laser-trimmed resistors ensure AD8274 AD8205 low gain error, low gain drift of 1 ppm/C (maximum), and AD8275 AD8206 high common-mode rejection of 80 dB. Low offset and low AMP03 AD8216 offset drift, combined with its fast settling time, make the AD8275 suitable for a variety of data acquisition applications where accurate and quick capture is required. Rev. B Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20082018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 07546-001 07546-002AD8275 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Reference ..................................................................................... 12 Applications ....................................................................................... 1 Common-Mode Input Voltage Range ..................................... 12 Pin Configuration ............................................................................. 1 Input Protection ......................................................................... 12 Typical Application ........................................................................... 1 Configurations ............................................................................ 13 General Description ......................................................................... 1 Applications Information .............................................................. 14 Revision History ............................................................................... 2 Driving a Single-Ended ADC ................................................... 14 Specifications ..................................................................................... 3 Differential Outputs ................................................................... 14 Absolute Maximum Ratings ............................................................ 4 Increasing Input Impedance ..................................................... 15 Maximum Power Dissipation ..................................................... 4 AC Coupling ............................................................................... 15 ESD Caution .................................................................................. 4 Using the AD8275 as a Level Translator in a Data Acquisition System .......................................................................................... 15 Pin Configuration and Function Descriptions ............................. 5 Outline Dimensions ....................................................................... 16 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 16 Theory of Operation ...................................................................... 11 Basic Connection ........................................................................ 11 Power Supplies ............................................................................ 12 REVISION HISTORY 11/2018Rev. A to Rev. B Change to Table 7 ........................................................................... 13 8/2010Rev. 0 to Rev. A Changes to Figure 40 ...................................................................... 14 10/2008Revision 0: Initial Version Rev. B Page 2 of 16