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AD7899AR-1

製品説明
仕様・特性

a FEATURES Fast (2.2 ␮s) 14-Bit ADC 400 kSPS Throughput Rate 0.3 ␮s Track/Hold Acquisition Time Single Supply Operation Selection of Input Ranges: ؎10 V, ؎5 V and ؎2.5 V 0 V to 2.5 V and 0 V to 5 V High-Speed Parallel Interface which Also Allows Interfacing to 3 V Processors Low Power, 80 mW Typ Power-Saving Mode, 20 ␮W Typ Overvoltage Protection on Analog Inputs Power-Down Mode via STBY Pin 5 V Single Supply 14-Bit 400 kSPS ADC AD7899 FUNCTIONAL BLOCK DIAGRAM VREF AVDD VDRIVE 6k⍀ STBY AD7899 2.5V REFERENCE + – RD TRACK/HOLD VINA VINB DB13 SIGNAL SCALING 14-BIT ADC OUTPUT LATCH DB0 CS BUSY/EOC CONVERSION CONTROL LOGIC CONVST INT/EXT CLOCK SELECT CLKIN INT CLOCK GND OPGND GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7899 is a fast, low-power, 14-bit A/D converter that operates from a single 5 V supply. The part contains a 2.2 µs successive-approximation ADC, a track/hold amplifier, 2.5 V reference, on-chip clock oscillator, signal conditioning circuitry, and a high-speed parallel interface. The part accepts analog input ranges of ± 10 V, ± 5 V, ± 2.5 V, 0 V to 2.5 V, and 0 V to 5 V. Overvoltage protection on the analog input for the part allows the input voltage to be exceeded without damaging the parts. 1. The AD7899 features a fast (2.2 µs) ADC allowing throughput rates of up to 400 kSPS. Speed of conversion can be controlled either by an internally trimmed clock oscillator or by an external clock. A conversion start signal (CONVST) places the track/hold into hold mode and initiates conversion. The BUSY/EOC signal indicates the end of the conversion. Data is read from the part via a 14-bit parallel data bus using the standard CS and RD signals. Maximum throughput for the AD7899 is 400 kSPS. 2. The AD7899 operates from a single 5 V supply and consumes only 80 mW typ making it ideal for low power and portable applications. 3. The part offers a high-speed parallel interface. The interface can operate in 3 V and 5 V mode allowing for easy connection to 3 V or 5 V microprocessors, microcontrollers, and digital signal processors. 4. The part is offered in three versions with different analog input ranges. The AD7899-1 offers the standard industrial ranges of ± 10 V and ± 5 V; the AD7899-2 offers a unipolar range of 0 V to 2.5 or 0 V to 5 V, and the AD7899-3 has an input range of ± 2.5 V. The AD7899 is available in a 28-lead SOIC and SSOP packages. REV. A 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. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001

ブランド

AD

会社名

Analog Devices

本社国名

U.S.A

事業概要

半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。

供給状況

 
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