2 LC MOS Quad 8-Bit DAC with Separate Reference Inputs AD7225 FEATURES FUNCTIONAL BLOCK DIAGRAM V A V B V C V D V REF REF REF REF DD Four 8-bit DACs with output amplifiers Separate reference input for each DAC INPUT DAC DAC A A V A OUT Microprocessor compatible with double-buffered inputs LATCH A LATCH A Simultaneous update of all 4 outputs INPUT DAC Operates with single or dual supplies DAC B B V B OUT DB7 LATCH B LATCH B DATA Extended temperature range operation (8-BIT) INPUT DAC No user trims required DB0 DAC C C V C OUT LATCH C LATCH C Skinny 24-lead PDIP, CERDIP, SOIC, and SSOP packages 28-lead PLCC package INPUT DAC DAC D D V D OUT LATCH D LATCH D WR CONTROL AD7225 A1 LOGIC A2 LDAC V AGND DGND SS Figure 1. GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7225 contains four 8-bit voltage output digital-to- 1. DACs and Amplifiers on CMOS Chip. analog converters, with output buffer amplifiers and interface The single-chip design of four 8-bit DACs and amplifiers logic on a single monolithic chip. Each DAC has a separate allows a dramatic reduction in board space requirements reference input terminal. No external trims are required to and offers increased reliability in systems using multiple achieve full specified performance for the part. converters. Its pinout is aimed at optimizing board layout with all analog inputs and outputs at one end of the The double-buffered interface logic consists of two 8-bit package and all digital inputs at the other. registers per channelan input register and a DAC register. Control Input A0 and Control Input A1 determine which input 2. Single- or Dual-Supply Operation. WR The voltage-mode configuration of the AD7225 allows register is loaded when goes low. Only the data held in the single-supply operation. The part can also be operated with DAC registers determines the analog outputs of the converters. dual supplies, giving enhanced performance for some The double-buffering allows simultaneous update of all four parameters. outputs under control of LDAC. All logic inputs are TTL and CMOS (5 V) level compatible, and the control logic is speed 3. Versatile Interface Logic. compatible with most 8-bit microprocessors. The AD7225 has a common 8-bit data bus with individual DAC latches, providing a versatile control architecture for Specified performance is guaranteed for input reference simple interface to microprocessors. The double-buffered voltages from 2 V to 12.5 V when using dual supplies. The part interface allows simultaneous update of the four outputs. is also specified for single-supply operation using a reference of 10 V. Each output buffer amplifier is capable of developing 10 V 4. Separate Reference Input for Each DAC. across a 2 k load. The AD7225 offers great flexibility in dealing with input signals, with a separate reference input provided for each The AD7225 is fabricated on an all ion-implanted, high speed, 2 DAC and each reference having variable input voltage linear-compatible CMOS (LC MOS) process, which is capability. specifically developed to integrate high speed digital logic circuits and precision analog circuitry on the same chip. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. DATA BUS 00986-001AD7225* PRODUCT PAGE QUICK LINKS Last Content Update: 02/23/2017 COMPARABLE PARTS DISCUSSIONS View a parametric search of comparable parts. View all AD7225 EngineerZone Discussions. DOCUMENTATION SAMPLE AND BUY Data Sheet Visit the product page to see pricing options. 2 AD7225: LC MOS Quad 8-Bit DAC with Separate TECHNICAL SUPPORT Reference Inputs Data Sheet Submit a technical question or find your regional support number. REFERENCE MATERIALS Solutions Bulletins & Brochures DOCUMENT FEEDBACK Digital to Analog Converters ICs Solutions Bulletin Submit feedback for this data sheet. DESIGN RESOURCES AD7225 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.