True Bipolar Input, 5 V Single Supply, 12-Bit, Serial 3.8 s ADC in 8-Pin Package

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 conversion 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).

PRODUCT HIGHLIGHTS

* Fast, 12-Bit ADC in 8-Pin Package The AD7895 contains a 3.8 µs ADC, a track/hold amplifier, control logic and a high speed serial interface, all in an 8-pin package. This offers considerable space saving over alternative solutions.

* Low Power, Single Supply Operation The AD7895 operates from a single +5 V supply and consumes only 20 mW. The automatic power-down mode, where the part goes into power-down once conversion is complete and “wakes up” before the next conversion cycle, makes the AD7895 ideal for battery-powered or portable applications.

* High Speed Serial Interface The part provides high speed serial data and serial clock lines allowing for an easy, two-wire serial interface arrangement.

* Fast 12-Bit ADC with 3.8 µs 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

* High Input Impedance