AD7472

a 1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs AD7470/AD7472 FEATURES Specified for VDD of 2.7 V to 5.25 V 1.75 MSPS for AD7470 (10-Bit) 1.5 MSPS for AD7472 (12-Bit) Low Power AD7470: 3.34 mW Typ at 1.5 MSPS with 3 V Supplies 7.97 mW Typ at 1.75 MSPS with 5 V Supplies AD7472: 3.54 mW Typ at 1.2 MSPS with 3 V Supplies 8.7 mW Typ at 1.5 MSPS with 5 V Supplies Wide Input Bandwidth 70 dB Typ SNR at 500 kHz Input Frequency Flexible Power/Throughput Rate Management No Pipeline Delays High Speed Parallel Interface Sleep Mode: 50 nA Typ 24-Lead SOIC and TSSOP Packages FUNCTIONAL BLOCK DIAGRAM AVDD DVDD REF IN VDRIVE 10-/12-BIT VIN T/H SUCCESSIVE APPROXIMATION OUTPUT DRIVERS ADC DB9 (DB11) DB0 CONVST CONTROL LOGIC AD7470/AD7472 CLK IN CS RD BUSY GENERAL DESCRIPTION The AD7470/AD7472 are 10-bit/12-bit high speed, low power, successive-approximation ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1.5 MSPS for the 12-bit AD7472 and up to 1.75 MSPS for the 10-bit AD7470. The parts contain a low noise, wide bandwidth track/hold amplifier that can handle input frequencies in excess of 1 MHz. The conversion process and data acquisition are controlled using standard control inputs allowing easy interfacing to microprocessors or DSPs. The input signal is sampled on the falling edge of CONVST and conversion is also initiated at this point. The BUSY goes high at the start of conversion and goes low 531.66 ns after falling ed...