8-Channel Differential DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC Data Sheet AD7609 FEATURES APPLICATIONS 8 simultaneously sampled inputs Power line monitoring and protection systems True differential inputs Multiphase motor control True bipolar analog input ranges: 20 V, 10 V Instrumentation and control systems Single 5 V analog supply and 2.3 V to 5.25 V V Multiaxis positioning systems DRIVE Fully integrated data acquisition solution Data acquisition systems (DAS) Analog input clamp protection COMPANION PRODUCTS Input buffer with 1 M analog input impedance External References: ADR421, ADR431 Second-order antialiasing analog filter Digital Isolators: ADuM1402, ADuM5000, ADuM5402 On-chip accurate reference and reference buffer Power: ADIsimPower, Supervisor Parametric Search 18-bit ADC with 200 kSPS on all channels Additional companion products on the AD7609 product page Oversampling capability with digital filter Flexible parallel/serial interface Table 1. High Resolution, Bipolar Input, Simultaneous SPI/QSPI/MICROWIRE/DSP compatible Sampling DAS Solutions Performance Single- True Number of 7 kV ESD rating on analog input channels Ended Differential Simultaneous 98 dB SNR, 107 dB THD Resolution Inputs Inputs Sampling Channels Dynamic range: up to 105 dB typical 1 18 Bits AD7608 AD7609 8 Low power: 100 mW 16 Bits AD7606B 8 Standby mode: 25 mW AD7606 8 64-lead LQFP package AD7606-6 6 AD7606-4 4 14 Bits AD7607 8 1 Protected by U.S. Patent Number 8,072,360. FUNCTIONAL BLOCK DIAGRAM AV AV REGCAP REGCAP REFCAPB REFCAPA CC CC 1M R FB V1+ CLAMP T/H SECOND- V1 CLAMP ORDER LPF 2.5V 2.5V R 1M FB LDO LDO 1M R FB REFIN/REFOUT V2+ CLAMP T/H SECOND- V2 CLAMP ORDER LPF R 1M FB REF SELECT 2.5V REF AGND 1M R FB V3+ CLAMP T/H OS 2 SECOND- V3 CLAMP ORDER LPF R 1M FB OS 1 OS 0 1M R FB V4+ CLAMP T/H D A SECOND- OUT V4 CLAMP SERIAL ORDER LPF R 1M FB D B OUT 8:1 PARALLEL/ MUX RD/SCLK 1M R FB 18-BIT DIGITAL V5+ SERIAL CLAMP SAR FILTER T/H CS INTERFACE SECOND- V5 CLAMP ORDER LPF R 1M FB PAR/SER SEL V DRIVE 1M R FB V6+ CLAMP T/H SECOND- V6 CLAMP PARALLEL DB 15:0 ORDER LPF R FB 1M AD7609 R 1M FB V7+ CLAMP T/H SECOND- V7 CLAMP ORDER LPF CLK OSC R FB 1M 1M R FB BUSY CONTROL V8+ CLAMP T/H INPUTS SECOND- FRSTDATA V8 CLAMP ORDER LPF R 1M FB AGND CONVST A CONVST B RESET RANGE Figure 1. Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. 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Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 09760-001AD7609 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Converter Details ....................................................................... 21 Applications ....................................................................................... 1 Analog Input ............................................................................... 21 Companion Products ....................................................................... 1 ADC Transfer Function ............................................................. 22 Functional Block Diagram .............................................................. 1 Internal/External Reference ...................................................... 23 Revision History ............................................................................... 2 Typical Connection Diagram ................................................... 24 General Description ......................................................................... 3 Power-Down Modes .................................................................. 24 Specif icat ions ..................................................................................... 4 Conversion Control ................................................................... 25 Timing Specifications .................................................................. 7 Digital Interface .............................................................................. 26 Absolute Maximum Ratings .......................................................... 11 Parallel Interface (PAR/SER SEL = 0) ...................................... 26 Thermal Resistance .................................................................... 11 Serial Interface (PAR/SER SEL = 1) ......................................... 26 ESD Caution ................................................................................ 11 Reading During Conversion ..................................................... 27 Pin Configuration and Function Descriptions ........................... 12 Digital Filter ................................................................................ 28 Typical Performance Characteristics ........................................... 15 Layout Guidelines....................................................................... 32 Terminology .................................................................................... 19 Outline Dimensions ....................................................................... 34 Theory of Operation ...................................................................... 21 Ordering Guide .......................................................................... 34 REVISION HISTORY 8/2019Rev. C to Rev. D 5/2018Rev. B to Rev. C Changed 10 V to 20 V and 5 V to 10 V ............ Throughout Changes to Patent Note, Note 1 ....................................................... 1 Changes to Table 1 ............................................................................ 1 Change to t Parameter, Table 3 ................................................. 7 CONV Changes to General Description Section ...................................... 3 Changes to Endnote 4, Table 2 ........................................................ 6 5/2014Rev. A to Rev. B Changes to Figure 8 through Figure 13 ......................................... 15 Changes to Patent Footnote ............................................................. 1 Changes to Figure 14 through Figure 19 ..................................... 16 Changes to Figure 37 ...................................................................... 22 Changes to Figure 20 through Figure 25 ..................................... 17 Changes to Figure 39 and Figure 40............................................. 23 Changes to Figure 26, Figure 30, and Figure 31 ......................... 18 Changes to Figure 34 Caption ....................................................... 21 2/2012Rev. 0 to Rev. A Changes to Figure 35 through Figure 37 ..................................... 22 Changes to Analog Input Ranges Section ................................... 21 Changes to Figure 54 and Figure 55 ............................................. 30 Changes to Figure 56 through Figure 59 ..................................... 31 7/2011Revision 0: Initial Version Changes to Ordering Guide .......................................................... 34 Rev. D Page 2 of 36