16-Bit, Isolated Sigma-Delta Modulator Data Sheet AD7402 FEATURES FUNCTIONAL BLOCK DIAGRAM VDD1 VDD2 10 MHz internal clock rate 16 bits, no missing codes AD7402 Signal-to-noise ratio (SNR): 87 dB typical MCLKOUT CLK CLK REF BUF CLOCK Effective number of bits (ENOB): 13.5 bits typical ENCODER DECODER (10MHz) Typical offset drift vs. temperature: 1.7 V/C On-board digital isolator VIN+ DATA CLK On-board reference MDAT - ADC ENCODER DECODER VIN Full-scale analog input range: 320 mV 40C to +105C operating range High common-mode transient immunity: >25 kV/s GND1 GND2 8-lead, wide-body SOIC, with increased creepage package Figure 1. Slew rate limited output for low electromagnetic interference (EMI) Safety and regulatory approvals UL recognition 5000 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice 5A VDE Certificate of Conformity DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 V = 1250 V IORM PEAK APPLICATIONS Shunt current monitoring AC motor controls Power and solar inverters Wind turbine inverters Data acquisition systems Analog-to-digital and opto-isolator replacements GENERAL DESCRIPTION 1 The AD7402 is a high performance, second-order, - modulator information can be reconstructed with an appropriate digital that converts an analog input signal into a high speed, single-bit filter to achieve 87 dB signal to noise ratio (SNR) at 39 kSPS. The data stream, with on-chip digital isolation based on Analog serial input/output can use a 3 V to 5.5 V or a 3.3 V supply (VDD2). Devices, Inc., iCoupler technology. The AD7402 operates from The serial interface is digitally isolated. High speed complementary a 4.5 V to 5.5 V (V ) power supply and accepts a differential DD1 metal oxide semiconductor (CMOS) technology, combined with input signal of 250 mV (320 mV full scale). The differential monolithic transformer technology, means the on-chip isolation input is ideally suited to shunt voltage monitoring in high provides outstanding performance characteristics, superior to voltage applications where galvanic isolation is required. alternatives such as optocoupler devices. The AD7402 device is The analog input is continuously sampled by a high performance offered in an 8-lead, wide body SOIC package and has an analog modulator, and converted to a ones density, digital operating temperature range of 40C to +105C. output stream with a data rate of 10 MHz. The original 1 Protected by U.S. Patents 5,952,849 6,873,065 and 7,075,329. Rev. A 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 2015 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. 12898-001AD7402 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 13 Applications ....................................................................................... 1 Circuit Information .................................................................... 13 Functional Block Diagram .............................................................. 1 Analog Input ............................................................................... 13 General Description ......................................................................... 1 Differential Inputs ...................................................................... 14 Revision History ............................................................................... 2 Digital Output ............................................................................. 14 Specifications ..................................................................................... 3 Applications Information .............................................................. 15 Timing Specifications .................................................................. 4 Current Sensing Applications ................................................... 15 Package Characteristics ............................................................... 5 Voltage Sensing Applications .................................................... 15 Insulation and Safety-Related Specifications ............................ 5 Input Filter .................................................................................. 15 Regulatory Information ............................................................... 5 Digital Filter ................................................................................ 16 DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation Power Supply Considerations ................................................... 19 Characteristics .............................................................................. 6 Grounding and Layout .............................................................. 19 Absolute Maximum Ratings ............................................................ 7 Insulation Lifetime ..................................................................... 19 ESD Caution .................................................................................. 7 Outline Dimensions ....................................................................... 20 Pin Configuration and Function Descriptions ............................. 8 Ordering Guide .......................................................................... 20 Typical Performance Characteristics ............................................. 9 Terminology .................................................................................... 12 REVISION HISTORY 6/15Rev. 0 to Rev. A Changes to Figure 1 .......................................................................... 1 Changes to Ordering Guide .......................................................... 20 2/15Revision 0: Initial Version Rev. A Page 2 of 20