16-Bit, Isolated, Sigma-Delta Modulator Data Sheet ADuM7704 FEATURES FUNCTIONAL BLOCK DIAGRAM V V DD1 DD2 5 MHz to 21 MHz master clock input frequency Offset drift vs. temperature: 0.25 V/C maximum ADuM7704 SNR: 82 dB typical LDO CLK CLK MCLKIN 16 bits, no missing codes DECODER ENCODER Full-scale analog input voltage range: 64 mV ENOB: 13 bits typical V IN+ DATA DATA GAIN - ADC I : 10 mA maximum DD1 MDAT V ENCODER DECODER IN On-board digital isolator Operating temperature range 40C to +125C (16-lead SOIC W) GND GND 1 2 40C to +105C (8-lead SOIC IC) Figure 1. High isolation common-mode transient immunity: 150 kV/s minimum, V = 3.3 V DD2 Wide-body SOICs 16-lead SOIC W 8-lead SOIC IC with increased creepage Safety and regulatory approvals UL recognition 5700 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice 5A VDE Certificate of Conformity DIN V VDE V 0884-10: V = 1270 V IORM PEAK DIN V VDE V 0884-11: V = 1060 V (pending) IORM PEAK APPLICATIONS Shunt current monitoring AC motor controls Power and solar inverters Wind turbine inverters Analog-to-digital and optoisolator replacement GENERAL DESCRIPTION The ADuM7704 is a high performance, second-order, - achieve an 82 dB signal-to-noise ratio (SNR) at 78.1 kSPS with a modulator that converts an analog input signal into a high 256 decimation rate and a 20 MHz master clock. The serial input speed, single-bit data stream, with on-chip digital isolation and output operates from a 5 V or a 3.3 V supply (VDD2). based on Analog Devices, Inc., iCoupler technology. The The serial interface is digitally isolated. High speed complementary device operates from a 4.5 V to 20 V power supply range (V ) DD1 metal-oxide semiconductor (CMOS) technology, combined with and accepts a pseudo differential input signal of 50 mV monolithic transformer technology, results in the on-chip (64 mV full-scale). The pseudo differential input is ideally isolation providing outstanding performance characteristics, suited to shunt voltage monitoring in high voltage applications superior to alternatives such as optocoupler devices. The where galvanic isolation is required. ADuM7704 is available in a 16-lead, wide-body SOIC W with The analog input is continuously sampled by a high performance an operating temperature range of 40C to +125C and an 8-lead, analog modulator and converted to a ones density digital output wide-body SOIC IC with an operating temperature range of stream with a data rate of up to 21 MHz. The original information 40C to +105C. can be reconstructed with an appropriate sinc3 digital filter to Rev. 0 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 2020 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. 25057-001ADuM7704 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configurations and Function Descriptions ............................9 Applications ....................................................................................... 1 Typical Performance Characteristics ........................................... 11 Functional Block Diagram .............................................................. 1 Terminology .................................................................................... 14 General Description ......................................................................... 1 Theory of Operation ...................................................................... 16 Revision History ............................................................................... 2 Circuit Information .................................................................... 16 Specifications ..................................................................................... 3 Analog Input ............................................................................... 16 Timing Specifications .................................................................. 4 Applications Information .............................................................. 18 Package Characteristics ............................................................... 5 Current Sensing Applications ................................................... 18 Insulation and Safety Related Specifications ............................ 5 Voltage Sensing Applications .................................................... 18 Regulatory Information ............................................................... 5 Input Filter ................................................................................... 18 DIN V VDE V 0884-10 Insulation Characteristics ................. 6 Digital Filter ................................................................................ 19 DIN V VDE V 0884-11 Insulation Characteristics (Pending) 7 Interfacing to ADSP-CM4xx .................................................... 20 Absolute Maximum Ratings ............................................................ 8 Grounding and Layout .............................................................. 20 Thermal Resistance ...................................................................... 8 Insulation Lifetime ..................................................................... 20 Insulation Ratings ......................................................................... 8 Outline Dimensions ....................................................................... 21 Electrostatic Discharge (ESD) Ratings ...................................... 8 Ordering Guide .......................................................................... 22 ESD Caution .................................................................................. 8 REVISION HISTORY 8/2020Revision 0: Initial Version Rev. 0 Page 2 of 22