Datasheet AD7609 (Analog Devices)

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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: ±10 V, ±5 V Instrumentation and control systems Single 5 V analog supply and 2.3 V to 5.25 V VDRIVE Multiaxis positioning systems Fully integrated data acquisition solution Data acquisition systems (DAS) Analog input clamp protection COMPANION PRODUCTS Input buffer with 1 MΩ analog input impedance Second-order antialiasing analog filter External References: ADR421, ADR431 On-chip accurate reference and reference buffer Digital Isolators: ADuM1402, ADuM5000, ADuM5402 18-bit ADC with 200 kSPS on all channels Power: ADIsimPower, Supervisor Parametric Search Oversampling capability with digital filter Additional companion products on the AD7609 product page 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
18 Bits AD7608 AD76091 8
Low power: 100 mW
16 Bits AD7606 8
Standby mode: 25 mW
AD7606-6 6
64-lead LQFP package
AD7606-4 4 14 Bits AD7607 8 1 Protected by U.S. Patent Number 8,072,360 B2.
FUNCTIONAL BLOCK DIAGRAM AV AV REGCAP REGCAP REFCAPB REFCAPA CC CC 1MΩ R V1+ FB CLAMP T/H SECOND- V1– CLAMP R 1MΩ ORDER LPF 2.5V 2.5V FB LDO LDO 1MΩ RFB REFIN/REFOUT V2+ CLAMP T/H SECOND- V2– CLAMP R 1MΩ ORDER LPF FB REF SELECT 2.5V 1MΩ REF R AGND FB V3+ CLAMP T/H OS 2 SECOND- V3– CLAMP R 1MΩ ORDER LPF FB OS 1 1MΩ OS 0 RFB V4+ CLAMP T/H SECOND- D V4– CLAMP OUTA R 1MΩ ORDER LPF SERIAL FB DOUTB 8:1 1MΩ R MUX PARALLEL/ FB RD/SCLK 18-BIT DIGITAL V5+ CLAMP SERIAL T/H SAR FILTER CS SECOND- INTERFACE V5– CLAMP R 1MΩ ORDER LPF FB PAR/SER SEL 1MΩ R VDRIVE FB V6+ CLAMP T/H SECOND- V6– CLAMP PARALLEL DB[15:0] R 1MΩ ORDER LPF FB 1MΩ R AD7609 FB V7+ CLAMP T/H SECOND- V7– CLAMP R 1MΩ ORDER LPF CLK OSC FB 1MΩ RFB V8+ BUSY CLAMP CONTROL T/H INPUTS SECOND- FRSTDATA V8– CLAMP R 1MΩ ORDER LPF FB
001
AGND CONVST A CONVST B RESET RANGE
09760- Figure 1.
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Document Outline Features Applications Companion Products Functional Block Diagram Table of Contents Revision History General Description Specifications Timing Specifications Timing Diagrams Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Terminology Theory of Operation Converter Details Analog Input Analog Input Ranges Analog Input Impedance Analog Input Clamp Protection Analog Input Antialiasing Filter Track-and-Hold Amplifiers ADC Transfer Function Internal/External Reference External Reference Mode Internal Reference Mode Typical Connection Diagram Power-Down Modes Conversion Control Simultaneous Sampling on All Analog Input Channels Simultaneously Sampling Two Sets of Channels Digital Interface Parallel Interface (/PAR/SER SEL = 0) Serial Interface (/PAR/SER SEL = 1) Reading During Conversion Digital Filter Layout Guidelines Outline Dimensions Ordering Guide