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AD7837BQN Datasheet(PDF) 1 Page - Analog Devices |
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AD7837BQN Datasheet(HTML) 1 Page - Analog Devices |
1 / 13 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 Complete, Dual 12-Bit MDACs AD7837/AD7847 FUNCTIONAL BLOCK DIAGRAMS LS INPUT LATCH CONTROL LOGIC AGNDA MS INPUT LATCH DAC LATCH A DAC A 48 12 LDAC A1 A0 CS WR RFBA VOUTA AD7837 DGND DAC B 12 DAC LATCH B 48 LS INPUT LATCH MS INPUT LATCH AGNDB RFBB VOUTB VSS VDD VREFA VREFB DB0 DB7 CONTROL LOGIC AGNDA DAC LATCH A DAC A CSB CSA WR VOUTA AD7847 DGND DAC B DAC LATCH B AGNDB VOUTB VSS VDD VREFA VREFB DB0 DB11 GENERAL DESCRIPTION The AD7837/AD7847 is a complete, dual, 12-bit multiplying digital-to-analog converter with output amplifiers on a mono- lithic CMOS chip. No external user trims are required to achieve full specified performance. Both parts are microprocessor compatible, with high speed data latches and interface logic. The AD7847 accepts 12-bit parallel data which is loaded into the respective DAC latch using the WR input and a separate Chip Select input for each DAC. The AD7837 has a double-buffered 8-bit bus interface structure with data loaded to the respective input latch in two write opera- tions. An asynchronous LDAC signal on the AD7837 updates the DAC latches and analog outputs. The output amplifiers are capable of developing ±10 V across a 2 k Ω load. They are internally compensated with low input off- set voltage due to laser trimming at wafer level. The amplifier feedback resistors are internally connected to VOUT on the AD7847. The AD7837/AD7847 is fabricated in Linear Compatible CMOS (LC 2MOS), an advanced, mixed technology process that com- bines precision bipolar circuits with low power CMOS logic. A novel low leakage configuration (U.S. Patent No. 4,590,456) ensures low offset errors over the specified temperature range. PRODUCT HIGHLIGHTS 1. The AD7837/AD7847 is a dual, 12-bit, voltage-out MDAC on a single chip. This single chip design offers considerable space saving and increased reliability over multichip designs. 2. The AD7837 and the AD7847 provide a fast versatile inter- face to 8-bit or 16-bit data bus structures. FEATURES Two 12-Bit MDACs with Output Amplifiers 4-Quadrant Multiplication Space-Saving 0.3", 24-Lead DIP and 24-Terminal SOIC Package Parallel Loading Structure: AD7847 (8 + 4) Loading Structure: AD7837 APPLICATIONS Automatic Test Equipment Function Generation Waveform Reconstruction Programmable Power Supplies Synchro Applications 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 |
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