True Bipolar Input, 5 V Single Supply, 14-Bit, Serial 4.5 s ADC in 8-Pin Package

The AD7894 is a fast, 14-Bit Analog-to-Digital Converter that operates from a single +5 V supply and is housed in a small 8-pin SOIC. The part contains a 5 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 AD7894 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, full-scale and offset errors, the AD7894 is also specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio. The part accepts an analog input range of ±10 V (AD7894-10), ±2.5V (AD7894-3), 0 V to 2.5 V (AD7894-2), and operates from a single +5 V supply consuming only 20 mW typical.

The AD7894 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 outline IC (SOIC).

PRODUCT HIGHLIGHTS

* Fast, 14-Bit ADC in 8-Lead Package The AD7894 contains a 5␣ µs ADC, a track/hold amplifier, control logic and a high speed serial interface, all in an 8-lead package. This offers considerable space saving over alternative solutions.

* Low Power, Single Supply Operation The AD7894 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 AD7894 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 14-Bit ADC with 5 µs Conversion Time

* 8-Lead SOIC Package

* Single 5 V Supply Operation

* High Speed, Easy-to-Use, Serial Interface

* On-Chip Track/Hold Amplifier

* High Input Impedance