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AD7249BN Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD7249BN Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 12 page REV. C 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 12-Bit Serial DACPORT® AD7249 GENERAL DESCRIPTION The AD7249 DACPORT contains a pair of 12-bit, voltage- output, digital-to-analog converters with output amplifiers and Zener voltage reference on a monolithic CMOS chip. No exter- nal trims are required to achieve full specified performance. The output amplifiers are capable of developing +10 V across a 2 k Ω load. The output voltage ranges with single supply opera- tion are 0 V to +5 V or 0 V to +10 V, while an additional bipolar ±5 V output range is available with dual supplies. The ranges are selected using the internal gain resistor. Interfacing to the AD7249 is serial, minimizing pin count and allowing a small package size. Standard control signals allow interfacing to most DSP processors and microcontrollers. The data stream consists of 16 bits, DB15 to DB13 are don’t care bits, the 13th bit (DB12) is used as the channel select bit and the remaining 12 bits (DB11 to DB0) contain the data to update the DAC. The 16-bit data word is clocked into the input register on each falling SCLK edge. The data format is natural binary in both unipolar ranges, while either offset binary or twos complement format may be selected in the bipolar range. A CLR function is provided which sets the output to 0 V in both unipolar ranges and in the twos comple- ment bipolar range, while with offset binary data format, the output is set to –REFIN. This function is useful as a power-on reset as it allows the outputs to be set to a known voltage level. The AD7249 features a serial interface which allows easy con- nection to both microcomputers and 16-bit digital signal proces- sors with serial ports. The serial data may be applied at rates up to 2 MHz allowing a DAC update rate of 125 kHz. The AD7249 is fabricated on linear compatible CMOS (LC 2MOS), an advanced, mixed technology process. It is pack- aged in 16-lead DIP and 16-lead SOIC packages. PRODUCT HIGHLIGHTS 1. Two complete 12-bit DACPORTs The AD7249 contains two complete voltage output, 12-bit DACs in both 16-lead DIP and SOIC packages. 2. Single or dual supply operation 3. Minimum 3-wire interface to most DSP processors 4. DAC update rate—125 kHz FUNCTIONAL BLOCK DIAGRAM FEATURES Two 12-Bit CMOS DAC Channels with On-Chip Voltage Reference Output Amplifiers Three Selectable Output Ranges per Channel –5 V to +5 V, 0 V to +5 V, 0 V to +10 V Serial Interface 125 kHz DAC Update Rate Small Size: 16-Lead DIP or SOIC Low Power Dissipation APPLICATIONS Process Control Industrial Automation Digital Signal Processing Systems Input/Output Ports DACPORT is a registered trademark of Analog Devices, Inc. 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 12-BIT DAC A 12-BIT DAC B A2 A1 INPUT SHIFT REGISTER AD7249 2R 2R 2R 2R VDD VSS REFOUT REFIN AGND DGND ROFSA VOUTA ROFSB VOUTB SCLK SDIN BIN/COMP CLR LDAC SYNC |
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