GENERAL DESCRIPTION

The AD7865 is a fast, low power, four-channel simultaneous sampling 14-bit A/D converter that operates from a single 5 V supply. The part contains a 2.4 μs successive approximation ADC, four track/hold amplifiers, 2.5 V reference, on-chip clock oscillator, signal conditioning circuitry and a high speed parallel interface. The input signals on four channels are sampled simultaneously thus preserving the relative phase information of the signals on the four analog inputs. The part accepts analog input ranges of ±10 V, ±5 V, ±2.5 V, 0 V to 2.5 V and 0 V to 5 V.

FEATURES

Fast (2.4 μs) 14-Bit ADC

Four Simultaneously Sampled Inputs

Four Track/Hold Amplifiers

0.35 μs Track/Hold Acquisition Time

2.4 μs Conversion Time per Channel

HW/SW Select of Channel Sequence for Conversion

Single Supply Operation

Selection of Input Ranges: ±10 V, ±5 V and ±2.5 V,

0 V to +5 V and 0 V to +2.5 V

High Speed Parallel Interface Which Also Allows

Interfacing to 3 V Processors

Low Power, 115 mW Typ

Power Saving Mode, 15 μW Typ

Overvoltage Protection on Analog Inputs

APPLICATIONS

AC Motor Control

Uninterruptible Power Supplies

Industrial Power Meters/Monitors

Data Acquisition Systems

Communications