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AD7854AQ データシート(PDF) 1 Page - Analog Devices |
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AD7854AQ データシート(HTML) 1 Page - Analog Devices |
1 / 28 page FUNCTIONAL BLOCK DIAGRAM CALIBRATION MEMORY AND CONTROLLER 2.5V REFERENCE AVDD AGND DVDD CLKIN CONVST BUSY CREF2 CREF1 REFIN/ REFOUT AIN(–) AIN(+) DGND DB11–DB0 WR HBEN RD CS PARALLEL INTERFACE/CONTROL REGISTER AD7854/AD7854L CHARGE REDISTRIBUTION DAC T/H COMP SAR + ADC CONTROL BUF REV. B 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a 3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs AD7854/AD7854L FEATURES Specified for VDD of 3 V to 5.5 V Read-Only Operation AD7854–200 kSPS; AD7854L–100 kSPS System and Self-Calibration Low Power Normal Operation AD7854: 15 mW (VDD = 3 V) AD7854L: 5.5 mW (VDD = 3 V) Automatic Power-Down After Conversion (25 W) AD7854: 1.3 mW 10 kSPS AD7854L: 650 W 10 kSPS Flexible Parallel Interface 12-Bit Parallel/8-Bit Parallel (AD7854) 28-Lead DIP, SOIC and SSOP Packages (AD7854) APPLICATIONS Battery-Powered Systems (Personal Digital Assistants, Medical Instruments, Mobile Communications) Pen Computers Instrumentation and Control Systems High Speed Modems PRODUCT HIGHLIGHTS 1. Operation with either 3 V or 5 V power supplies. 2. Flexible power management options including automatic power-down after conversion. By using the power manage- ment options a superior power performance at slower throughput rates can be achieved: AD7854: 1 mW typ @ 10 kSPS AD7854L: 1 mW typ @ 20 kSPS 3. Operates with reference voltages from 1.2 V to AVDD. 4. Analog input ranges from 0 V to AVDD. 5. Self-calibration and system calibration. 6. Versatile parallel I/O port. 7. Lower power version AD7854L. GENERAL DESCRIPTION The AD7854/AD7854L is a high speed, low power, 12-bit ADC that operates from a single 3 V or 5 V power supply, the AD7854 being optimized for speed and the AD7854L for low power. The ADC powers up with a set of default conditions at which time it can be operated as a read-only ADC. The ADC contains self-calibration and system calibration options to en- sure accurate operation over time and temperature and has a number of power-down options for low power applications. The AD7854 is capable of 200 kHz throughput rate while the AD7854L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo- differential sampling scheme. The AD7854 and AD7854L input voltage range is 0 to VREF (unipolar) and –VREF/2 to +VREF/2, centered at VREF/2 (bipolar). The coding is straight binary in unipolar mode and twos complement in bipolar mode. Input signal range is to the supply and the part is capable of convert- ing full-power signals to 100 kHz. CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 µW in power-down mode. The part is available in 28-lead, 0.6 inch wide dual-in-line pack- age (DIP), 28-lead small outline (SOIC) and 28-lead small shrink outline (SSOP) packages. See Page 27 for data sheet index. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 |
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同様の説明 - AD7854AQ |
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