AD7889

a Preliminary Technical Information FEATURES www.datasheet4u.com Fast 12-Bit ADC with 1.4 µs Conversion Time Up to 600 kSPS Throughput Rate (Mode A) Single Supply Operation On-Chip Track/Hold Amplifier Selection of Input Ranges: ±10 V or ±5 V for AD7889-1 0 V to +2.5 V or 0V to+5 V for AD7889-2 ±2.5 V for AD7889-3 High Speed Serial Interface Low Power, 60 mW typ VREF 2½K LC2MOS Single Supply, 12-Bit 600 kSPS ADC AD7889 FUNCTIONAL BLOCK DIAGRAM VDD +2.5V REFERENCE AD7889 RFS TRACK /HOLD 12-BIT ADC SDATA SCLK VIN1 VIN2 SIGNAL SCALING CONTROL LOGIC STANDBY CONVST CONTCLK 16/14B AGND DGND GENERAL DESCRIPTION The AD7889 is a high speed, low power, 12-bit A/D converter that operates from a single +5 V supply. The part contains a successive approximation ADC, an on-chip track/hold amplifier, an internal +2.5 V reference and on-chip versatile interface structures that allows serial communication to a microprocessor in a variety of operating modes. The part accepts an analog input range of ±10 V or ±5 V (AD7889-1), 0 V to +2.5 V or 0 V to +5V (AD7889-2) and ±2.5 V (AD7889-3). Overvoltage protection on the analog inputs for the AD7889-1 and AD7889-3 allows the input voltage to go to ±17 V or ±7 V respectively without damaging the ports. The AD7889 offers a choice of serial interface modes which allows direct connection to the serial ports of microcontrollers and digital signal processors. In addition to the traditional dc accuracy specifications such as linearity, full-scal...