2 LC MOS a Complete 14-Bit DAC AD7840 FEATURES FUNCTIONAL BLOCK DIAGRAM Complete 14-Bit Voltage Output DAC Parallel and Serial Interface Capability 80 dB Signal-to-Noise Ratio Interfaces to High Speed DSP Processors e.g., ADSP-2100, TMS32010, TMS32020 45 ns min WR Pulse Width Low Power 70 mW typ. Operates from 65 V Supplies GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7840 is a fast, complete 14-bit voltage output D/A con- 1. Complete 14-Bit D/A Function verter. It consists of a 14-bit DAC, 3 V buried Zener reference, The AD7840 provides the complete function for creating ac DAC output amplifier and high speed control logic. signals and dc voltages to 14-bit accuracy. The part features an on-chip reference, an output buffer amplifier and 14-bit The part features double-buffered interface logic with a 14-bit D/A converter. input latch and 14-bit DAC latch. Data is loaded to the input latch in either of two modes, parallel or serial. This data is then 2. Dynamic Specifications for DSP Users transferred to the DAC latch under control of an asynchronous In addition to traditional dc specifications, the AD7840 is LDAC signal. A fast data setup time of 21 ns allows direct specified for ac parameters including signal-to-noise ratio and parallel interfacing to digital signal processors and high speed harmonic distortion. These parameters along with important 16-bit microprocessors. In the serial mode, the maximum serial timing parameters are tested on every device. data clock rate can be as high as 6 MHz. 3. Fast, Versatile Microprocessor Interface The analog output from the AD7840 provides a bipolar output The AD7840 is capable of 14-bit parallel and serial interfac- range of 3 V. The AD7840 is fully specified for dynamic per- ing. In the parallel mode, data setup times of 21 ns and write formance parameters such as signal-to-noise ratio and harmonic pulse widths of 45 ns make the AD7840 compatible with distortion as well as for traditional dc specifications. Full power modern 16-bit microprocessors and digital signal processors. output signals up to 20 kHz can be created. In the serial mode, the part features a high data transfer rate of 6 MHz. The AD7840 is fabricated in linear compatible CMOS 2 (LC MOS), an advanced, mixed technology process that com- bines precision bipolar circuits with low power CMOS logic. The part is available in a 24-pin plastic and hermetic dual-in-line package (DIP) and is also packaged in a 28-termi- nal plastic leaded chip carrier (PLCC). REV. B 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 617/329-4700 Fax: 617/326-8703AD7840* PRODUCT PAGE QUICK LINKS Last Content Update: 02/23/2017 COMPARABLE PARTS DISCUSSIONS View a parametric search of comparable parts. View all AD7840 EngineerZone Discussions. DOCUMENTATION SAMPLE AND BUY Data Sheet Visit the product page to see pricing options. AD7840: Complete 14-Bit CMOS DAC Data Sheet TECHNICAL SUPPORT REFERENCE MATERIALS Submit a technical question or find your regional support number. Solutions Bulletins & Brochures Digital to Analog Converters ICs Solutions Bulletin DOCUMENT FEEDBACK Submit feedback for this data sheet. DESIGN RESOURCES AD7840 Material Declaration PCN-PDN Information Quality And Reliability Symbols and Footprints This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not trigger a change to either the revision number or the content of the product data sheet. This dynamic page may be frequently modified.