8-Channel DAS with 16-Bit, 1 MSPS Bipolar Input, Simultaneous Sampling ADC Data Sheet AD7606C-16 FEATURES CALIBRATION AND DIAGNOSTICS 16-bit ADC with 1 MSPS on all channels Per channel system phase, offset, and gain calibration Input buffer with 1 M minimum analog input impedance (R ) Analog input open circuit detection feature IN Single 5 V analog supply and 1.71 V to 5.25 V V Self diagnostics and monitoring features DRIVE Per channel selectable analog input ranges CRC error checking on read and write data and registers Bipolar single-ended: 12.5 V, 10 V, 6.25 V, 5 V, 2.5 V APPLICATIONS Unipolar single-ended: 0 V to 12.5 V, 0 V to 10 V, 0 V to 5 V Power line monitoring Bipolar differential: 20 V, 12.5 V, 10 V, 5 V Protective relays Two bandwidth options: 25 kHz and 220 kHz, per channel Multiphase motor control Flexible digital filter, oversampling ratio up to 256 Instrumentation and control systems 40C to +125C operating range Data acquisition systems 21 V input clamp protection with 6 kV ESD Pin to pin compatible to the AD7606B and AD7606 COMPANION PRODUCTS Performance Voltage References: ADR4525, LT6657, LTC6655 92 dB typical SNR for 20 V bipolar differential range Digital Isolators: ADuM142E, ADuM6422A, ADuM5020, 95 dB SNR, oversampling by 32 ADuM5028 100 dB typical THD for all other ranges AD7606x Family Software Model TUE = 0.05% of FSR maximum, external reference Additional companion products on the AD7606C-16 product 0.5 ppm/C typical PFS and NFS error drift page 3 ppm/C typical reference temperature coefficient FUNCTIONAL BLOCK DIAGRAM 5V 5V 1.71V TO 5.25V 100nF 100nF 1F 100nF 1F AV AV V REGCAP REGCAP DRIVE CC CC ALDO DLDO 1M V1+ CLAMP CLK OSC CONVST PGA 1M SAR V1 RESET LPF CLAMP RANGE CONTROL INPUTS OS0 TO OS2 1M V8+ BUSY CLAMP PROGRAMMABLE PGA 1M SAR FRSTDATA V8 DIGITAL FILTER LPF CLAMP OPTIONAL SERIAL D A TO D H OUT OUT RC FILTER ADC, PGA, AND SDI CHANNEL REFCAPA SCLK CONFIGURATION PARALLEL/ 10F + CS SERIAL INTERFACE OPTIONAL EXTERNAL PARALLEL GAIN, OFFSET DB0 TO DB15 REFCAPB REFERENCE AND PHASE AV CC RD CALIBRATION INTERNAL REFIN/REFOUT +2.5V REFERENCE WR V V IN OUT + 100nF 2.5V DIAGNOSTICS PAR/SER SEL ADR4525 1F 0.1F REF AND SENSOR DISCONNECT REFSELECT GND AD7606C-16 REFGND AGND Figure 1. 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Trademarks and registered trademarks are the property of their respective owners. 26071-001AD7606C-16 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Padding Oversampling .............................................................. 36 Calibration and Diagnostics ........................................................... 1 External Oversampling Clock .................................................. 36 Applications ...................................................................................... 1 System Calibration Features ......................................................... 37 Companion Products ....................................................................... 1 System Phase Calibration .......................................................... 37 Functional Block Diagram .............................................................. 1 System Gain Calibration ........................................................... 37 Revision History ............................................................................... 2 System Offset Calibration ......................................................... 38 General Description ......................................................................... 3 Analog Input Open Circuit Detection .................................... 38 Specifications .................................................................................... 4 Digital Interface .............................................................................. 40 Timing Specifications .................................................................. 7 Parallel Interface ......................................................................... 41 Absolute Maximum Ratings ......................................................... 11 Serial Interface ............................................................................ 44 Thermal Resistance .................................................................... 11 Diagnostics ...................................................................................... 49 Electrostatic Discharge (ESD) Ratings .................................... 11 Reset Detection ........................................................................... 49 ESD Caution................................................................................ 11 Digital Error ................................................................................ 49 Pin Configuration and Function Descriptions .......................... 12 Diagnostics Multiplexer ............................................................ 52 Typical Performance Characteristics ........................................... 15 Typical Connection Diagram ....................................................... 53 Terminology .................................................................................... 26 Applications Information ............................................................. 55 Theory of Operation ...................................................................... 28 Layout Guidelines ...................................................................... 55 Analog Front-End ...................................................................... 28 Register Summary .......................................................................... 57 SAR ADC ..................................................................................... 29 Register Details ............................................................................... 58 Reference ..................................................................................... 31 Outline Dimensions ....................................................................... 74 Operation Modes ........................................................................ 31 Ordering Guide .......................................................................... 74 Digital Filter .................................................................................... 34 REVISION HISTORY 1/2021Revision 0: Initial Version Rev. 0 Page 2 of 74