Datasheet AD7357 (Analog Devices)

Differential Input, Dual, Simultaneous Sampling, 4.2 MSPS, 14-Bit, SAR ADC Data Sheet AD7357 FEATURES FUNCTIONAL BLOCK DIAGRAM Dual 14-bit SAR ADC VDD VDRIVE Simultaneous sampling AD7357 Throughput rate: 4.2 MSPS per channel VINA+ 14-BIT T/H SUCCESSIVE Specified for a V VINA– SDATA DD of 2.5 V APPROXIMATION A ADC Power dissipation: 36 mW at 4.2 MSPS REFA On-chip reference: 2.048 V ± 0.25%, 6 ppm/°C BUF Dual conversion with read SCLK High speed serial interface CONTROL REF LOGIC CS SPI-/QSPI-/MICROWIRE-/DSP-compatible BUF −40°C to +125°C Y grade operation, −40°C to +85°C B grade operation REFB 14-BIT SUCCESSIVE 16-lead TSSOP and 18-lead LFCSP packages VINB+ APPROXIMATION SDATAB T/H ADC Qualified for automotive applications VINB–
001
APPLICATIONS AGND AGND REFGND DGND
07757-
Automotive radar
Figure 1.
Data acquisition systems Motion control I and Q demodulation RFID readers GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD73571 is a dual, 14-bit, high speed, low power, successive 1. Two Complete ADC Functions. approximation analog-to-digital converter (ADC) that operates These functions allow simultaneous sampling and conversion from a single 2.5 V power supply and features throughput rates of two channels. The conversion result of both channels up to 4.2 MSPS. The device contains two ADCs, each preceded is simultaneously available on separate data lines or in by a low noise, wide bandwidth track-and-hold circuit that can succession on one data line if only one serial port is available. handle input frequencies in excess of 110 MHz. 2. High Throughput with Low Power Consumption. The conversion process and data acquisition use standard control The AD7357 offers a 4.2 MSPS throughput rate with 36 mW inputs allowing for easy interfacing to microprocessors or power consumption. digital signal processors (DSPs). The input signal is sampled on 3. Simultaneous Sampling. the falling edge of CS; a conversion is also initiated at this point. The device features two standard successive approximation The conversion time is determined by the SCLK frequency. ADCs with accurate control of the sampling instant via a CS The AD7357 uses advanced design techniques to achieve very input and once off conversion control. low power dissipation at high throughput rates. With a 2.5 V
Table 1. Related Devices
supply and a 4.2 MSPS throughput rate, the device consumes
Generic Resolution Throughput Analog Input
14 mA typically. The device also offers flexible power and throughput rate management options. AD7356 12-bit 5 MSPS Differential AD7352 12-bit 3 MSPS Differential The analog input range for the device is the differential common AD7266 12-bit 2 MSPS Differential/single- mode ±VREF/2. The AD7357 has an on-chip 2.048 V reference ended that can be overdriven when an external reference is preferred. AD7866 12-bit 1 MSPS Single-ended The AD7357 is available in a 16-lead thin shrink smal outline AD7366 12-bit 1 MSPS Single-ended bipolar package (TSSOP) and an 18-lead lead frame chip scale package AD7367 14-bit 1 MSPS Single-ended bipolar (LFCSP). 1 Protected by U.S. Patent No. 6,681,332.
Rev. E 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 ©2009–2015 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 REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION ANALOG INPUT STRUCTURE ANALOG INPUTS DRIVING DIFFERENTIAL INPUTS Differential Amplifier Operational Amplifier 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 SUGGESTIONS GROUNDING AND LAYOUT EVALUATING THE AD7357 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE AUTOMOTIVE PRODUCTS