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AD7357BRUZ Datasheet(PDF) 1 Page - Analog Devices |
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AD7357BRUZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page Differential Input, Dual, Simultaneous Sampling, 4.2 MSPS, 14-Bit, SAR ADC AD7357 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. FEATURES Dual 14-bit SAR ADC Simultaneous sampling Throughput rate: 4.2 MSPS per channel Specified for a VDD of 2.5 V Power dissipation: 36 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 16-lead TSSOP package APPLICATIONS Data acquisition systems Motion control I & Q demodulation RFID readers FUNCTIONAL BLOCK DIAGRAM SCLK AD7357 14-BIT SUCCESSIVE APPROXIMATION ADC 14-BIT SUCCESSIVE APPROXIMATION ADC CONTROL LOGIC SDATAA CS SDATAB DGND REFGND AGND VDRIVE VDD AGND T/H T/H BUF BUF REF VINA+ VINA– REFA VINB+ VINB– REFB 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; a 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 throughput rates. With a 2.5 V supply and a 4.2 MSPS throughput rate, the part consumes 14 mA typically. The part also offers flexible power/throughput rate management options. The analog input range for the part is the differential common mode ±VREF/2. The AD7357 has an on-chip 2.048 V reference that can be overdriven when an external reference is preferred. The AD7357 is available in a 16-lead thin shrink small outline package (TSSOP). PRODUCT HIGHLIGHTS 1. Two Complete ADC Functions. These functions allow simultaneous sampling and conversion of two channels. The conversion result of both channels is simultaneously available on separate data lines or in suc- cession on one data line if only one serial port is available. 2. High Throughput with Low Power Consumption. The AD7357 offers a 4.2 MSPS throughput rate with 36 mW power consumption. 3. Simultaneous Sampling. The part features two standard successive approximation ADCs with accurate control of the sampling instant via a CS input and once off conversion control. Table 1. Related Devices Generic Resolution Throughput Analog Input AD7356 12-bit 5 MSPS Differential AD7352 12-bit 3 MSPS Differential AD7266 12-bit 2 MSPS Differential/single-ended AD7866 12-bit 1 MSPS Single-ended AD7366 12-bit 1 MSPS Single-ended bipolar AD7367 14-bit 1 MSPS Single-ended bipolar 1 Protected by U.S. Patent No. 6,681,332. |
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