Datasheet AD7608 (Analog Devices) - 4

Data Sheet AD7608 GENERAL DESCRIPTION
The AD7608 is an 18-bit, 8-channel simultaneous sampling, The AD7608 operates from a single 5 V supply and can analog-to-digital data acquisition system (DAS). The part contains accommodate ±10 V and ±5 V true bipolar input signals while analog input clamp protection, a second-order antialiasing filter, sampling at throughput rates up to 200 kSPS for al channels. a track-and-hold amplifier, an 18-bit charge redistribution The input clamp protection circuitry can tolerate voltages up successive approximation analog-to-digital converter (ADC), a to ±16.5 V. The AD7608 has 1 MΩ analog input impedance flexible digital filter, a 2.5 V reference and reference buffer, and regardless of sampling frequency. The single supply operation, high speed serial and paral el interfaces. on-chip filtering, and high input impedance eliminate the need for driver op amps and external bipolar supplies. The AD7608 antialiasing filter has a 3 dB cutoff frequency of 22 kHz and provides 40 dB antialias rejection when sampling at 200 kSPS. The flexible digital filter is pin driven, yields improvements in SNR, and reduces the 3 dB bandwidth. Rev. A | Page 3 of 32 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 (/SER SEL = 0) Serial Interface (/SER SEL = 1) Reading During Conversion Digital Filter Layout Guidelines Outline Dimensions Ordering Guide