Datasheet AD7352 (Analog Devices)

Differential Input, Dual, Simultaneous Sampling, 3 MSPS, 12-Bit, SAR ADC Data Sheet AD7352 FEATURES FUNCTIONAL BLOCK DIAGRAM Dual 12-bit SAR ADC V V DD DRIVE Simultaneous sampling AD7352 Throughput rate: 3 MSPS per channel V Specified for V INA+ 12-BIT DD at 2.5 V T/H SUCCESSIVE V SDATA No conversion latency INA– APPROXIMATION A ADC REF Power dissipation: 26 mW at 3 MSPS A On-chip reference: 2.048 V ± 0.25%, 6 ppm/°C BUF Dual conversion with read High speed serial interface: SPI-/QSPI™-/MICROWIRE™-/ DSP- SCLK CONTROL REF LOGIC compatible CS −40°C to +125°C operation BUF Available in a 16-lead TSSOP REF APPLICATIONS B 12-BIT SUCCESSIVE VINB+ APPROXIMATION SDATAB Data acquisition systems T/H ADC VINB– Motion control
001
I and Q demodulation
07044-
AGND AGND REFGND DGND
Figure 1.
GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD73521 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 al ow 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 conversion process and data acquisition use standard The AD7352 offers a 3 MSPS throughput rate with 26 mW control inputs allowing for easy interfacing to microprocessors power consumption. or DSPs. The input signal is sampled on the falling edge of CS; 3. No Conversion Latency. and a conversion is also initiated at this point. The conversion The AD7352 features two standard successive time is determined by the SCLK frequency. approximation ADCs with accurate control of the sampling instant via a CS 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 The analog input range for the part is the differential common- AD7266 12-bit 2 MSPS Differential/single-ended mode ±VREF/2. The AD7352 has an on-chip 2.048 V reference AD7866 12-bit 1 MSPS Single-ended that can be overdriven when an external reference is preferred. AD7366 12-bit 1 MSPS Single-ended bipolar 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 rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2008–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications Functional Block Diagram General Description Product Highlights Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Terminology Theory of Operation Circuit Information Converter Operation Analog Input Structure Analog Inputs Driving Differential Inputs Differential Amplifier Op Amp Pair Voltage Reference ADC Transfer Function Modes of Operation Normal Mode Partial Power-Down Mode Full Power-Down Mode Power-Up Times Power vs. Throughput Rate Serial Interface Application Hints Grounding and Layout Evaluating the AD7352 Performance Outline Dimensions Ordering Guide