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AD628 Dataheets PDF



Part Number AD628
Manufacturers Analog Devices
Logo Analog Devices
Description High Common-Mode Voltage Programmable Gain Difference Amplifier
Datasheet AD628 DatasheetAD628 Datasheet (PDF)

High Common-Mode Voltage, Programmable Gain Difference Amplifier AD628 02992-001 FEATURES High common-mode input voltage range ±120 V at VS = ±15 V Gain range 0.1 to 100 Operating temperature range: −40°C to +85°C Supply voltage range Dual supply: ±2.25 V to ±18 V Single supply: 4.5 V to 36 V Excellent ac and dc performance Offset temperature stability RTI: 10 μV/°C maximum Offset: ±1.5 V mV maximum CMRR RTI: 75 dB minimum, dc to 500 Hz, G = +1 APPLICATIONS High voltage current shunt sensing P.

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High Common-Mode Voltage, Programmable Gain Difference Amplifier AD628 02992-001 FEATURES High common-mode input voltage range ±120 V at VS = ±15 V Gain range 0.1 to 100 Operating temperature range: −40°C to +85°C Supply voltage range Dual supply: ±2.25 V to ±18 V Single supply: 4.5 V to 36 V Excellent ac and dc performance Offset temperature stability RTI: 10 μV/°C maximum Offset: ±1.5 V mV maximum CMRR RTI: 75 dB minimum, dc to 500 Hz, G = +1 APPLICATIONS High voltage current shunt sensing Programmable logic controllers Analog input front end signal conditioning +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA Isolation Sensor signal conditioning Power supply monitoring Electrohydraulic controls Motor controls GENERAL DESCRIPTION The AD628 is a precision difference amplifier that combines excellent dc performance with high common-mode rejection over a wide range of frequencies. When used to scale high voltages, it allows simple conversion of standard control voltages or currents for use with single-supply ADCs. A wideband feedback loop minimizes distortion effects due to capacitor charging of Σ-Δ ADCs. A reference pin (VREF) provides a dc offset for converting bipolar to single-sided signals. The AD628 converts +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA input signals to a single-ended output within the input range of single-supply ADCs. The AD628 has an input common mode and differential mode operating range of ±120 V. The high common mode, input impedance makes the device well suited for high voltage measurements across a shunt resistor. The inverting input of the buffer amplifier is available for making a remote Kelvin connection. FUNCTIONAL BLOCK DIAGRAM REXT2 REXT1 +VS 7 6 RG 100kΩ –IN 8 100kΩ +IN 1 10kΩ G = +0.1 –IN A1 +IN 10kΩ 2 –VS 3 VREF 10kΩ 4 CFILT –IN A2 +IN OUT 5 AD628 Figure 1. CMRR (dB) 130 120 110 100 90 80 70 60 50 40 30 10 VS = ±15V VS = ±2.5V 100 1k 10k FREQUENCY (Hz) Figure 2. CMRR vs. Frequency of the AD628 100k 02992-002 A precision 10 kΩ resistor connected to an external pin is provided for either a low-pass filter or to attenuate large differential input signals. A single capacitor implements a lowpass filter. The AD628 operates from single and dual supplies and is available in an 8-lead SOIC_N or an 8-lead MSOP. It operates over the standard industrial temperature range of −40°C to +85°C. Rev. G 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. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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 ©2002–2007 Analog Devices, Inc. All rights reserved. AD628 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 7 Thermal Characteristics .............................................................. 7 ESD Caution.................................................................................. 7 Pin Configuration and Function Descriptions............................. 8 Typical Performance Characteristics ............................................. 9 Test Circuits..................................................................................... 13 REVISION HISTORY 4/07—Rev. F to Rev. G Changes to Features.......................................................................... 1 Changes to Figure 22...................................................................... 11 Changes to Figure 25...................................................................... 13 Changes to Voltage Level Conversion Section............................ 17 Changes to Monitoring Battery Voltages Section ...................... 18 Changes to Figure 34...................................................................... 18 Changes to Figure 35...................................................................... 19 Updated Outline Dimensions ....................................................... 20 3/06—Rev. E to Rev. F Changes to Table 1.......................................


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