Datasheet AD7895 (Analog Devices)

5 V, 12-Bit, Serial 3.8
m
s
a
ADC in 8-Pin Package AD7895 FEATURES FUNCTIONAL BLOCK DIAGRAM Fast 12-Bit ADC with 3.8
m
s Conversion Time REF IN V 8-Pin Mini-DlP and SOIC DD Single 5 V Supply Operation AD7895 High Speed, Easy-to-Use, Serial Interface On-Chip Track/Hold Amplifier Selection of Input Ranges TRACK/HOLD
6
10 V for AD7895-10
6
2.5 V for AD7895-3 SIGNAL VIN SCALING* 0 V to +2.5 V for AD7895-2 12-BIT ADC High Input Impedance Low Power: 20 mW max 14-Bit Pin Compatible Upgrade (AD7894) OUTPUT CONVST REGISTER GND 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
PRODUCT HIGHLIGHTS
converter, an on-chip track/hold amplifier, an on-chip clock and 1. Fast, 12-Bit ADC in 8-Pin Package a high speed serial interface. The AD7895 contains a 3.8 µs ADC, a track/hold amplifier, Output data from the AD7895 is provided via a high speed, control logic and a high speed serial interface, all in an 8-pin serial interface port. This two-wire serial interface has a serial package. This offers considerable space saving over alterna- clock input and a serial data output with the external serial clock tive solutions. accessing the serial data from the part. 2. Low Power, Single Supply Operation In addition to the traditional dc accuracy specifications such as The AD7895 operates from a single +5 V supply and linearity and full-scale and offset errors, the AD7895 is specified consumes only 20 mW. The automatic power-down mode, for dynamic performance parameters, including harmonic where the part goes into power-down once conversion is distortion and signal-to-noise ratio. complete and “wakes up” before the next conversion cycle, makes the AD7895 ideal for battery-powered or portable The part accepts an analog input range of ± 10 V (AD7895-10), ± applications. 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. 3. High Speed Serial Interface The part provides high speed serial data and serial clock lines The AD7895 features a high sampling rate mode and, for low allowing for an easy, two-wire serial interface arrangement. 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). REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties
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