AD7894 Datasheet | Analog Devices

FEATURES Fast 14-Bit ADC with 5 ␮ s Conversion Time 8-Lead SOIC Package Single 5 V Supply Operation High Speed, Easy-to-Use, Serial Interface On-Chip Track/Hold Amplifier Selection of Input Ranges ؎10 V for AD7894-10 ؎2.5 V for AD7894-3 0 V to +2.5 V for AD7894-2 High Input Impedance Low Power: 20 m W Typ Pin patible Upgrade of 12-Bit AD7895 5 V, 14-Bit Serial, 5 ␮s ADC in SO-8 Package AD7894 FUNCTIONAL BLOCK DIAGRAM REF IN VDD TRACK/ HOLD 14-BIT ADC SIGNAL SCALING- CONVST OUTPUT REGISTER - AD7894-10, AD7894-3 BUSY SCLK SDATA GENERAL DESCRIPTION The AD7894 is a fast, 14-bit ADC that operates from a single +5 V supply and is housed in a small 8-lead SOIC. The part contains a 5 µs successive approximation A/D converter, an onchip 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), ± 2.5 V (AD7894-3), 0 V to +2.5 V (AD7894-2), and operates from a single +5 V supply consuming only 20 m W 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 plete and “wakes up” before the next conversion cycle. The part is available in a small outline IC (SOIC). PRODUCT HIGHLIGHTS 1. 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...