AD7357

www.DataSheet4U.com Preliminary Technical Data FEATURES Dual 14-bit SAR ADC Simultaneous sampling Throughput rate: 4.2 MSPS per channel Specified for VDD of 2.5 V Power dissipation: 35 mW at 4.2 MSPS On-chip reference: 2.048 V ± 0.25%, 6 ppm/°C Dual conversion with read High speed serial interface SPI-/QSPI-/MICROWIRE-/DSP-compatible −40°C to +125°C operation Shutdown mode: 10 µA maximum 16-lead TSSOP package Differential Input, Dual, Simultaneous Sampling, 4.2 MSPS, 14-Bit, SAR ADC AD7357 FUNCTIONAL BLOCK DIAGRAM VDD VDRIVE AD7357 VINA+ VINA– REFA T/H 14-BIT SUCCESSIVE APPROXIMATION ADC SDATAA BUF REF BUF CONTROL LOGIC SCLK CS REFB VINB+ VINB– T/H 14-BIT SUCCESSIVE APPROXIMATION ADC SDATAB AGND AGND REFGND DGND Figure 1. GENERAL DESCRIPTION The AD73571 is a dual, 14-bit, high speed, low power, successive approximation analog-to-digital converter (ADC) that operates from a single 2.5 V power supply and features throughput rates up to 4.2 MSPS. The part contains two ADCs, each preceded by a low noise, wide bandwidth track-and-hold circuit that can handle input frequencies in excess of 110 MHz. The conversion process and data acquisition use standard control inputs allowing for easy interfacing to microprocessors or DSPs. The input signal is sampled on the falling edge of CS; conversion is also initiated at this point. The conversion time is determined by the SCLK frequency. The AD7357 uses advanced design techniques to achieve very low power dissipation at high th...