Evaluation Board Hardware; Ad7656-1/57-1/58-1 Device Description - Analog Devices EVAL-AD7656-1SDZ User Manual

Evaluation Board User
Guide

EVALUATION BOARD HARDWARE

AD7656-1/57-1/58-1 DEVICE DESCRIPTION

The AD7656-1/AD7657-1/AD7658-1 are reduced decoupling
pin and software-compatible versions of
AD7656/AD7657/AD7658. The AD7656-1/AD7657-
1/AD7658-1 devices contain six 16-/14-/12-bit, fast, low power
successive approximation ADCs in a package designed on the
iCMOS® process (industrial CMOS). iCMOS is a process
combining high voltage silicon with submicron CMOS and
complementary bipolar technologies. It enables the
development of a wide range of high performance analog ICs
capable of 33 V operation in a footprint that no previous
generation of high voltage parts could achieve. Unlike analog
ICs using conventional CMOS processes, iCMOS components
can accept bipolar input signals while providing increased
performance, which dramatically reduces power consumption
and package size.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
The AD7656-1/AD7657-1/AD7658-1 feature throughput rates
of up to 250 kSPS. The parts contain low noise, wide bandwidth
track-and-hold amplifiers that can handle input frequencies
up to 4.5 MHz.
The conversion process and data acquisition are controlled
using the CONVST signals and an internal oscillator. Three
CONVST pins (CONVST A, CONVST B, and CONVST C)
allow independent, simultaneous sampling of the three ADC
pairs. The AD7656-1/AD7657-1/AD7658-1 have a high speed
parallel and serial interface, allowing the devices to interface
with microprocessors or DSPs. When the serial interface is
selected, each part has a daisy-chain feature that allows multiple
ADCs to connect to a single serial interface.
The AD7656-1/AD7657-1/AD7658-1 can accommodate true
bipolar input signals in the ±4 × VREF and ±2 × VREF ranges.
Each AD7656-1/AD7657-1/AD7658-1 also contains an on-chip
2.5 V reference.
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