FEATURES

Seven Simultaneously-Sampling Sample-and-Hold (S/H) Capacitors

Fully Differential Inputs

Flexible Digital Interface with Four Modes

− One Mode 100% Software-Compatible to VECANA01

− SPI and Two Parallel Modes

Two Up−Down Counter Modules On-Chip

12-Bit System Gain Adjustment for Every Channel

12-Bit Accurate System Offset Adjustment for Every Channel

APPLICATIONS

Motor Control

DESCRIPTION

The ADS7869 is a motor control front-end that includes three analog-to-digital converters (ADCs) with a total

of seven sample-and-hold capacitors and 12 fully differential input channels. There are four sign comparators

connected to four input channels. There are also three additional fully differential inputs; each input is

connected to a window comparator and a sign comparator.

In addition, the ADS7869 also offers a very flexible digital interface with a parallel port that can be configured

to different standards. Furthermore, a serial peripheral interface (SPI) and a specialized serial interface with

three data lines (VECANA01 mode) are provided. This allows the ADS7869 to interface with most digital signal

processors (DSPs) or microcontrollers. The chip is specialized for motor-control applications. For the position

sensor analysis, two up−down counters are added on the silicon. This feature ensures that the analog input

of the encoder is held at the same point of time as the counter value.