16-Bit, Isolated Sigma-Delta Modulator Data Sheet AD7403 FEATURES FUNCTIONAL BLOCK DIAGRAM V V DD1 DD2 5 MHz to 20 MHz external clock input rate 16 bits, no missing codes Signal-to-noise ratio (SNR): 88 dB typical Effective number of bits (ENOB): 14.2 bits typical CLK CLK MCLKIN DECODER ENCODER (5MHz Offset drift vs. temperature TO 20MHz) REF AD7403: 1.6 V/C typical AD7403-8: 2 V/C typical V IN+ - ADC On-board digital isolator V DATA DATA IN MDAT ENCODER DECODER On-board reference Full-scale analog input range: 320 mV AD7403 Operating range AD7403: 40C to + 125C AD7403-8: 40C to + 105C GND GND 1 2 High common-mode transient immunity: >25 kV/s Figure 1. Wide-body SOIC with increased creepage package Slew rate limited output for low 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 optoisolator replacements information can be reconstructed with an appropriate digital GENERAL DESCRIPTION filter to achieve 88 dB signal to noise ratio (SNR) at 78.1 kSPS. 1 The AD7403 is a high performance, second-order, - modulator The serial input/output can use a 5 V or a 3 V supply (V ). DD2 that converts an analog input signal into a high speed, single-bit The serial interface is digitally isolated. High speed complementary data stream, with on-chip digital isolation based on Analog Devices, Inc., iCoupler technology. The device operates from a metal oxide semiconductor (CMOS) technology, combined with 5 V (V ) power supply and accepts a differential input signal monolithic transformer technology, means the on-chip isolation DD1 of 250 mV (320 mV full-scale). The differential input is ideally provides outstanding performance characteristics, superior to suited to shunt voltage monitoring in high voltage applications alternatives such as optocoupler devices. The AD7403 device is offered in a 16-lead, wide-body SOIC package and has an oper- where galvanic isolation is required. ating temperature range of 40C to +125C. The AD7403-8 The analog input is continuously sampled by a high performance device is offered in an 8-lead, wide-body SOIC package and has analog modulator, and converted to a ones density digital output an operating temperature range of 40C to +105C. stream with a data rate of up to 20 MHz. The original 1 Protected by U.S. Patents 5,952,849 6,873,065 and 7,075,329. 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 20142015 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com BUF 12196-001AD7403 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 15 Applications ....................................................................................... 1 Circuit Information .................................................................... 15 Functional Block Diagram .............................................................. 1 Analog Input ............................................................................... 15 General Description ......................................................................... 1 Differential Inputs ...................................................................... 16 Revision History ............................................................................... 2 Digital Output ............................................................................. 16 Specif icat ions ..................................................................................... 3 Applications Information .............................................................. 17 AD7403 .......................................................................................... 3 Current Sensing Applications ................................................... 17 AD7403-8 ...................................................................................... 4 Voltage Sensing Applications .................................................... 17 Timing Specifications .................................................................. 5 Input Filter ................................................................................... 18 Package Characteristics ............................................................... 6 Digital Filter ................................................................................ 18 Insulation and Safety Related Specifications ............................ 6 Interfacing to ADSP-CM4xx .................................................... 21 Regulatory Information ............................................................... 6 Power Supply Considerations ................................................... 21 DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation Grounding and Layout .............................................................. 21 Characteristics .............................................................................. 7 Insulation Lifetime ..................................................................... 21 Absolute Maximum Ratings ............................................................ 8 Outline Dimensions ....................................................................... 23 ESD Caution .................................................................................. 8 Ordering Guide .......................................................................... 24 Pin Configurations and Function Descriptions ........................... 9 Typical Performance Characteristics ........................................... 10 Terminology .................................................................................... 14 REVISION HISTORY 5/15Rev. A to Rev. B 11/14Rev. 0 to Rev. A Added AD7403-8 ................................................................ Universal Change to Figure 1 ............................................................................ 1 Added Endnote 3, Table 1 ............................................................... 4 Changes to Regulatory Information Section and Table 5 ............ 5 Added Table 2 Renumbered Sequentially .................................... 4 Changes to Table 7 ............................................................................. 7 Added Figure 4 .................................................................................. 7 Changes to Ordering Guide .......................................................... 20 Added Figure 6 and Table 11........................................................... 9 Added Figure 8 ................................................................................ 10 4/14Revision 0: Initial Version Added Figure 14 and Figure 18..................................................... 11 Added Figure 20 .............................................................................. 12 Added Power Supply Considerations Section, Figure 41, and Figure 42 .......................................................................................... 21 Added Figure 47, Outline Dimensions ........................................ 23 Changes to Ordering Guide .......................................................... 24 Rev. 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