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AD5439 데이터시트(PDF) 1 Page - Analog Devices |
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AD5439 데이터시트(HTML) 1 Page - Analog Devices |
1 / 32 page Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface AD5429/AD5439/AD5449 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 that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES 10 MHz multiplying bandwidth 50 MHz serial interface 2.5 V to 5.5 V supply operation ±10 V reference input Pin compatible 8-, 10-, and 12-bit DACs Extended temperature range: −40°C to +125°C 16-lead TSSOP package Guaranteed monotonic Power-on reset Daisy-chain mode Readback function 0.5 µA typical current consumption APPLICATIONS Portable battery-powered applications Waveform generators Analog processing Instrumentation applications Programmable amplifiers and attenuators Digitally controlled calibration Programmable filters and oscillators Composite video Ultrasound Gain, offset, and voltage trimming FUNCTIONAL BLOCK DIAGRAM SYNC AD5429/AD5439/AD5449 VREFB VREFA SCLK SDIN IOUT1B IOUT1A 8-/10-/12-BIT R-2R DAC A 8-/10-/12-BIT R-2R DAC B RFBA POWER-ON RESET DAC REGISTER DAC REGISTER RFB R RFB R IOUT2A IOUT2B LDAC VDD CLR RFBB INPUT REGISTER INPUT REGISTER SHIFT REGISTER LDAC SDO Figure 1. GENERAL DESCRIPTION The AD5429/AD5439/AD54491 are CMOS 8-, 10-, and 12-bit dual-channel current output digital-to-analog converters, respectively. These devices operate from a 2.5 V to 5.5 V power supply, making them suited to battery-powered and other applications. The applied external reference input voltage (VREF) determines the full-scale output current. An integrated feedback resistor (RFB) provides temperature tracking and full-scale voltage output when combined with an external current-to-voltage precision amplifier. These DACs utilize a double-buffered, 3-wire serial interface that is compatible with SPI®, QSPI™, MICROWIRE™, and most DSP interface standards. In addition, a serial data out pin (SDO) allows daisy-chaining when multiple packages are used. Data readback allows the user to read the contents of the DAC register via the SDO pin. On power-up, the internal shift register and latches are filled with zeros and the DAC outputs are at zero scale. As a result of manufacture on a CMOS submicron process, these parts offer excellent 4-quadrant multiplication character- istics, with large signal multiplying bandwidths of 10 MHz. The AD5429/AD5439/AD5449 DAC are available in 16-lead TSSOP packages. 1 US Patent Number 5,689,257. |
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