AD7895 Datasheet | Analog Devices

FEATURES Fast 12-Bit ADC with 3.8 ␮ s Conversion Time 8-Pin Mini-Dl P 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 m W max 14-Bit Pin patible Upgrade (AD7894) 5 V, 12-Bit, Serial 3.8 ␮s ADC in 8-Pin Package AD7895 FUNCTIONAL BLOCK DIAGRAM REF IN VDD TRACK/HOLD V IN SIGNAL SCALING- 12-BIT ADC CONVST OUTPUT REGISTER BUSY SCLK SDATA GENERAL DESCRIPTION - AD7895-10, AD7895-3 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 m W 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 plete and “wakes up” before the next conversion cycle. The part is available in a small, 8-pin, 0.3" wide, plastic dual-inline package (mini-DIP) and in an 8-pin, small outline IC (SOIC). PRODUCT HIGHLIGHTS 1. Fast, 12-Bit ADC in 8-Pin Package The AD7895 contains a 3.8 µs ADC, a track/hold amplifier, control...