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AD7899ARS-2 Datasheet(PDF) 1 Page - Analog Devices |
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AD7899ARS-2 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page 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. a AD7899 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 5 V Single Supply 14-Bit 400 kSPS ADC FUNCTIONAL BLOCK DIAGRAM TRACK/HOLD AVDD VREF BUSY/ EOC CLKIN RD CS AD7899 VINB VINA + – 14-BIT ADC OUTPUT LATCH DB0 DB13 CONVERSION CONTROL LOGIC INT/EXT CLOCK SELECT INT CLOCK SIGNAL SCALING 2.5V REFERENCE 6k VDRIVE CONVST OPGND GND STBY 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 GENERAL DESCRIPTION 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. 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. The AD7899 is available in a 28-lead SOIC and SSOP packages. PRODUCT HIGHLIGHTS 1. The AD7899 features a fast (2.2 µs) ADC allowing through- put rates of up to 400 kSPS. 2. The AD7899 operates from a single 5 V supply and con- sumes 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 connec- tion 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. |
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