Differential Input, Dual, Simultaneous Sampling, 5 MSPS, 12-Bit, SAR ADC Data Sheet AD7356 FEATURES FUNCTIONAL BLOCK DIAGRAM V V DD DRIVE Dual 12-bit SAR ADC Simultaneous sampling AD7356 Throughput rate: 5 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: 36 mW at 5 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 V SDATA B INB+ 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 AD7356 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 5 MSPS. The device of two channels. The conversion result of both channels contains two ADCs, each preceded by a low noise, wide bandwidth is simultaneously available on separate data lines or in track-and-hold circuit that can handle input frequencies in excess succession on one data line if only one serial port is of 110 MHz. available. 2. High Throughput with Low Power Consumption. The conversion process and data acquisition use standard control The AD7356 offers a 5 MSPS throughput rate with 36 mW inputs allowing for easy interfacing to microprocessors or DSPs. power consumption. The input signal is sampled on the falling edge of CS a conversion 3. No Conversion Latency. is also initiated at this point. The conversion time is determined The AD7356 features two standard successive approximation by the SCLK frequency. ADCs with accurate control of the sampling instant via a The AD7356 uses advanced design techniques to achieve very CS input and, once off, conversion control. low power dissipation at high throughput rates. With a 2.5 V supply and a 5 MSPS throughput rate, the part consumes typically Table 1. Related Devices 14 mA. The part also offers a flexible power/throughput rate Generic Resolution Throughput Analog Input management option. AD7352 12-bit 3 MSPS Differential The analog input range for the part is the differential common AD7357 14-bit 4.25 MSPS Differential mode V /2. The AD7356 has an on-chip 2.048 V reference REF AD7266 12-bit 2 MSPS Differential/single ended that can be overdriven when an external reference is preferred. AD7866 12-bit 1 MSPS Single-ended AD7366 12-bit 1 MSPS Single-ended bipolar The AD7356 is available in a 16-lead thin shrink small outline AD7367 14-bit 1 MSPS Single-ended bipolar 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 06505-001AD7356 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 AD7356 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