GENERAL DESCRIPTION

The AD7895 is a fast 12-bit ADC that operates from a single +5 V supply and is housed in a small 8-pin mini-DIP and 8-pin SOIC. The part contains a 3.8 µs successive approximation A/D converter, an on-chip track/hold amplifier, an on-chip clock and a high speed serial interface.

Output data from the AD7895 is provided via a high speed, serial interface port. This two-wire serial interface has a serial clock input and a serial data output with the external serial clock accessing the serial data from the part.

In addition to the traditional dc accuracy specifications such as linearity and full-scale and offset errors, the AD7895 is specified for dynamic performance parameters, including harmonic distortion and signal-to-noise ratio.

The part accepts an analog input range of ±10 V (AD7895-10), ±2.5 V (AD7895-3), 0 V to 2.5 V (AD7895-2) and operates from a single +5 V supply, consuming only 20 mW max.

The AD7895 features a high sampling rate mode and, for low power applications, a proprietary automatic power-down mode where the part automatically goes into power down once conversion is complete and “wakes up” before the next conver sion cycle.

The part is available in a small, 8-pin, 0.3 wide, plastic dual-in-line package (mini-DIP) and in an 8-pin, small outline IC (SOIC).

FEATURES

Fast 12-Bit ADC with 3.8 ms Conversion Time

8-Pin Mini-DlP and SOIC

Single 5 V Supply Operation

High Speed, Easy-to-Use, Serial Interface

On-Chip Track/Hold Amplifier

Selection of Input Ranges

±10 V for AD7895-10

±2.5 V for AD7895-3

0 V to +2.5 V for AD7895-2

High Input Impedance

Low Power: 20 mW max

14-Bit Pin Compatible Upgrade (AD7894)