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AD7894ARZ-2 Folha de dados(PDF) 1 Page - Analog Devices |
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AD7894ARZ-2 Folha de dados(HTML) 1 Page - Analog Devices |
1 / 12 page 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. a AD7894 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., 1998 5 V, 14-Bit Serial, 5 s ADC in SO-8 Package FUNCTIONAL BLOCK DIAGRAM SIGNAL SCALING* TRACK/ HOLD 14-BIT ADC AD7894 OUTPUT REGISTER REF IN VDD VIN CONVST GND BUSY SCLK SDATA *AD7894-10, AD7894-3 FEATURES Fast 14-Bit ADC with 5 s Conversion Time 8-Lead SOIC Package Single 5 V Supply Operation High Speed, Easy-to-Use, Serial Interface On-Chip Track/Hold Amplifier Selection of Input Ranges 10 V for AD7894-10 2.5 V for AD7894-3 0 V to +2.5 V for AD7894-2 High Input Impedance Low Power: 20 mW Typ Pin Compatible Upgrade of 12-Bit AD7895 GENERAL DESCRIPTION The AD7894 is a fast, 14-bit ADC that operates from a single +5 V supply and is housed in a small 8-lead SOIC. The part contains a 5 µs successive approximation A/D converter, an on- chip track/hold amplifier, an on-chip clock and a high speed serial interface. Output data from the AD7894 is provided via a high speed, serial interface port. This two-wire serial interface has a serial clock input and a serial data output with the external serial clock accessing the serial data from the part. In addition to the traditional dc accuracy specifications such as linearity, full-scale and offset errors, the AD7894 is also speci- fied for dynamic performance parameters including harmonic distortion and signal-to-noise ratio. The part accepts an analog input range of ±10 V (AD7894-10), ±2.5 V (AD7894-3), 0 V to +2.5 V (AD7894-2), and operates from a single +5 V supply consuming only 20 mW typical. The AD7894 features a high sampling rate mode and, for low power applications, a proprietary automatic power-down mode where the part automatically goes into power-down once conver- sion is complete and “wakes up” before the next conversion cycle. The part is available in a small outline IC (SOIC). PRODUCT HIGHLIGHTS 1. Fast, 14-Bit ADC in 8-Lead Package The AD7894 contains a 5 µs ADC, a track/hold amplifier, control logic and a high speed serial interface, all in an 8-lead package. This offers considerable space saving over alterna- tive solutions. 2. Low Power, Single Supply Operation The AD7894 operates from a single +5 V supply and con- sumes only 20 mW. The automatic power-down mode, where the part goes into power-down once conversion is complete and “wakes up” before the next conversion cycle, makes the AD7894 ideal for battery powered or portable applications. 3. High Speed Serial Interface The part provides high speed serial data and serial clock lines allowing for an easy, two-wire serial interface arrangement. |
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Descrição semelhante - AD7894ARZ-2 |
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