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AD7898AR-10 Datenblatt(PDF) 1 Page - Analog Devices |
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AD7898AR-10 Datenblatt(HTML) 1 Page - Analog Devices |
1 / 16 page AD7898 a REV. 0 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. 5 V, 12-Bit, Serial 220 kSPS ADC in an 8-Lead Package 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 FUNCTIONAL BLOCK DIAGRAM SIGNAL SCALING* 12-BIT ADC TRACK/HOLD AD7898 VDD REF IN VIN CONVST GND VDRIVE SCLK SDATA *AD7898-10, AD7898-3 OUTPUT REGISTER FEATURES Fast 12-Bit ADC with 220 kSPS Throughput Rate 8-Lead SOIC Single 5 V Supply Operation High-Speed, Flexible, Serial Interface that Also Allows Interfacing to 3 V Processors On-Chip Track/Hold Amplifier Selection of Input Ranges 10 V for AD7898-10 2.5 V for AD7898-3 High Input Impedance Low Power: 22.5 mW Max GENERAL DESCRIPTION The AD7898 is a fast 12-bit ADC that operates from a single 5 V supply and is housed in a small 8-lead SOIC package. The part contains a successive approximation A/D converter, an on- chip track/hold amplifier, an on-chip clock, and a high-speed serial interface. The AD7898 offers two modes of operation. In Mode 0, con- version is initiated by the CONVST input and the conversion process is controlled by an internal clock oscillator. In this mode, the serial interface consists of three wires and the AD7898 is capable of throughput rates up to 220 kSPS. In Mode 1, the conversion process is controlled by an externally-applied SCLK with data being accessed from the part during conversion. In this mode, the serial interface consists of three wires and the AD7898 is capable of throughput rates up to 220 kSPS. In addition to the traditional dc accuracy specifications such as linearity and full-scale and offset errors, the AD7898 is specified for dynamic performance parameters, including harmonic dis- tortion and signal-to-noise ratio. The part accepts an analog input range of ±10 V (AD7898-10) and ±2.5 V (AD7898-3), and operates from a single 5 V supply, consuming only 22.5 mW max. The part is available in an 8-lead small outline IC (SOIC). PRODUCT HIGHLIGHTS 1. Fast, 12-Bit ADC in 8-Lead Package The AD7898 contains a 220 kSPS ADC, a track/hold ampli- fier, control logic, and a high-speed serial interface, all in an 8-lead package. This offers considerable space saving over alternative solutions. 2. Low Power, Single Supply Operation The AD7898 operates from a single 5 V supply and con- sumes only 22.5 mW. The VDRIVE function allows the serial interface to connect directly to either 3 V or 5 V processor systems independent of VDD. 3. Flexible, High-Speed Serial Interface The part provides a flexible, high-speed serial interface that has two distinct modes of operation. Mode 0 provides a three- wire interface with data being accessed from the AD7898 when conversion is complete. Mode 1 offers a three-wire interface with data being accessed during conversion. 4. Power-Down Mode The AD7898 offers a proprietary power-down capability when operated in Mode 1, making the part ideal for portable or hand-held applications. |
Ähnliche Teilenummer - AD7898AR-10 |
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Ähnliche Beschreibung - AD7898AR-10 |
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