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AD7244JR Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7244JR Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 12 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs AD7242/AD7244 FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION The AD7242/AD7244 is a fast, complete, dual 12-bit/14-bit voltage output D/A converter. It consists of a 12-bit/14-bit DAC, 3 V buried Zener reference, DAC output amplifiers and high speed serial interface logic. Interfacing to both DACs is serial, minimizing pin count and allowing a small package size. Standard control signals allow interfacing to most DSP processors and microcontrollers. Asynchronous control of DAC updating for both DACs is made possible with a separate LDAC input for each DAC. The AD7242/AD7244 operates from ±5 V power supplies, providing an analog output range of ±3 V. A REF OUT/REF IN function allows the DACs to be driven from the on-chip 3 V reference or from an external reference source. The AD7242/AD7244 is fabricated in Linear Compatible CMOS (LC 2MOS), an advanced mixed technology process that combines precision bipolar circuits with low power CMOS logic. Both parts are available in a 24-pin, 0.3-inch wide, plastic or hermetic dual-in-line package (DIP) and in a 28-pin, plastic small outline (SOIC) package. The AD7242 and AD7244 are available in the same pinout to allow easy upgrade from 12-bit to 14-bit performance. FEATURES Two 12-Bit/14-Bit DACs with Output Amplifiers AD7242: 12-Bit Resolution AD7244: 14-Bit Resolution On-Chip Voltage Reference Fast Settling Time AD7242: 3 s to 1/2 LSB AD7244: 4 s to 1/2 LSB High Speed Serial Interface Operates from 5 V Supplies Specified Over –40 C to +85 C in Plastic Packages Low Power – 130 mW typ PRODUCT HIGHLIGHTS 1. Complete, Dual 12-Bit/14-Bit DACs The AD7242/AD7244 provides the complete function for generating voltages to 12-bit/14-bit resolution. The part features an on-chip reference, output buffer amplifiers and two 12-bit/14-bit D/A converters. 2. High Speed Serial Interface The AD7242/AD7244 provides a high speed, easy-to-use, serial interface allowing direct interfacing to DSP processors and microcontrollers. A separate serial port is provided for each DAC. 3. Small Package Size The AD7242/AD7244 is available in a 24-pin DIP and a 28- pin SOIC package offering considerable space saving over comparable solutions. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1996 |
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