Differential Input, Dual, Simultaneous Sampling, 3 MSPS, 12-Bit, SAR ADC Data Sheet AD7352 FEATURES FUNCTIONAL BLOCK DIAGRAM V V DD DRIVE Dual 12-bit SAR ADC Simultaneous sampling AD7352 Throughput rate: 3 MSPS per channel V INA+ 12-BIT T/H Specified for V at 2.5 V DD SUCCESSIVE V SDATA INA A APPROXIMATION No conversion latency ADC REF A Power dissipation: 26 mW at 3 MSPS On-chip reference: 2.048 V 0.25%, 6 ppm/C BUF Dual conversion with read SCLK CONTROL High speed serial interface: SPI-/QSPI-/MICROWIRE-/ DSP- REF LOGIC CS compatible BUF 40C to +125C operation Available in a 16-lead TSSOP REF B 12-BIT APPLICATIONS SUCCESSIVE SDATA V INB+ B APPROXIMATION T/H ADC Data acquisition systems V INB Motion control I and Q demodulation AGND AGND REFGND DGND Figure 1. GENERAL DESCRIPTION PRODUCT HIGHLIGHTS 1 The AD7352 is a dual, 12-bit, high speed, low power, successive 1. Two Complete ADC Functions. approximation ADC that operates from a single 2.5 V power These functions allow simultaneous sampling and conversion supply and features throughput rates up to 3 MSPS. The part of two channels. The conversion result of both channels is contains two ADCs, each preceded by a low noise, wide band- simultaneously available on separate data lines or in suc- width track-and-hold circuit that can handle input frequencies cession on one data line if only one serial port is available. in excess of 110 MHz. 2. High Throughput With Low Power Consumption. The AD7352 offers a 3 MSPS throughput rate with 26 mW The conversion process and data acquisition use standard power consumption. control inputs allowing for easy interfacing to microprocessors 3. No Conversion Latency. or DSPs. The input signal is sampled on the falling edge of CS The AD7352 features two standard successive and a conversion is also initiated at this point. The conversion approximation ADCs with accurate control of the sampling time is determined by the SCLK frequency. CS instant via a input and, once off, conversion control. The AD7352 uses advanced design techniques to achieve very low power dissipation at high throughput rates. With a 2.5 V Table 1. Related Devices supply and a 3 MSPS throughput rate, the part consumes 10 mA Generic Resolution Throughput Analog Input typically. The part also offers a flexible power/throughput rate AD7356 12-bit 5 MSPS Differential management options. AD7357 14-bit 4.2MSPS Differential AD7266 12-bit 2 MSPS Differential/single-ended The analog input range for the part is the differential common- AD7866 12-bit 1 MSPS Single-ended mode V /2. The AD7352 has an on-chip 2.048 V reference REF AD7366 12-bit 1 MSPS Single-ended bipolar that can be overdriven when an external reference is preferred. AD7367 14-bit 1 MSPS Single-ended bipolar The AD7352 is available in a 16-lead thin shrink small outline package (TSSOP). 1 Protected by U.S. Patent No. 6,681,332. Rev. B Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20082015 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 07044-001AD7352 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Analog Inputs.............................................................................. 13 Applications ....................................................................................... 1 Driving Differential Inputs ....................................................... 13 Functional Block Diagram .............................................................. 1 Voltage Reference ....................................................................... 14 General Description ......................................................................... 1 ADC Transfer Function ............................................................. 14 Product Highlights ........................................................................... 1 Modes of Operation ....................................................................... 15 Revision History ............................................................................... 2 Normal Mode .............................................................................. 15 Specifications ..................................................................................... 3 Partial Power-Down Mode ....................................................... 15 Timing Specifications .................................................................. 5 Full Power-Down Mode ............................................................ 16 Absolute Maximum Ratings ............................................................ 6 Power-Up Times ......................................................................... 17 ESD Caution .................................................................................. 6 Power vs. Throughput Rate ....................................................... 17 Pin Configuration and Function Descriptions ............................. 7 Serial Interface ................................................................................ 18 Typical Performance Characteristics ............................................. 8 Application Hints ........................................................................... 19 Terminology .................................................................................... 10 Grounding and Layout .............................................................. 19 Theory of Operation ...................................................................... 12 Evaluating the AD7352 Performance ...................................... 19 Circuit Information .................................................................... 12 Outline Dimensions ....................................................................... 20 Converter Operation .................................................................. 12 Ordering Guide .......................................................................... 20 Analog Input Structure .............................................................. 12 REVISION HISTORY 8/15Rev. A to Rev. B Changes to Figure 20 ...................................................................... 14 8/11Rev. 0 to Rev. A Added Applications Section ............................................................ 1 Changes to Table 1 ............................................................................ 1 Changes to Figure 21 and Figure 22 ............................................. 14 Added Voltage Reference Section ................................................. 14 Updated Outline Dimensions ....................................................... 20 10/08Revision 0: Initial Version Rev. B Page 2 of 20