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AD7225KR-REEL Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7225KR-REEL Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 24 page LC2MOS Quad 8-Bit DAC with Separate Reference Inputs AD7225 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2010 Analog Devices, Inc. All rights reserved. FEATURES Four 8-bit DACs with output amplifiers Separate reference input for each DAC Microprocessor compatible with double-buffered inputs Simultaneous update of all 4 outputs Operates with single or dual supplies Extended temperature range operation No user trims required Skinny 24-lead PDIP, CERDIP, SOIC, and SSOP packages 28-lead PLCC package FUNCTIONAL BLOCK DIAGRAM VREFA VREFB VREFC VREFD VDD LDAC VSS AGND DGND INPUT LATCH A DAC LATCH A VOUTA DAC A A INPUT LATCH B DAC LATCH B VOUTB DAC B B INPUT LATCH C DAC LATCH C VOUTC DAC C C INPUT LATCH D CONTROL LOGIC DAC LATCH D VOUTD DAC D D DB7 DATA (8-BIT) DB0 WR A1 A2 AD7225 Figure 1. GENERAL DESCRIPTION The AD7225 contains four 8-bit voltage output digital-to- analog converters, with output buffer amplifiers and interface logic on a single monolithic chip. Each DAC has a separate reference input terminal. No external trims are required to achieve full specified performance for the part. The double-buffered interface logic consists of two 8-bit registers per channel—an input register and a DAC register. Control Input A0 and Control Input A1 determine which input register is loaded when WR goes low. Only the data held in the DAC registers determines the analog outputs of the converters. The double-buffering allows simultaneous update of all four outputs under control of LDAC. All logic inputs are TTL and CMOS (5 V) level compatible, and the control logic is speed compatible with most 8-bit microprocessors. Specified performance is guaranteed for input reference voltages from 2 V to 12.5 V when using dual supplies. The part is also specified for single-supply operation using a reference of 10 V. Each output buffer amplifier is capable of developing 10 V across a 2 kΩ load. The AD7225 is fabricated on an all ion-implanted, high speed, linear-compatible CMOS (LC2MOS) process, which is specifically developed to integrate high speed digital logic circuits and precision analog circuitry on the same chip. PRODUCT HIGHLIGHTS 1. DACs and Amplifiers on CMOS Chip. The single-chip design of four 8-bit DACs and amplifiers allows a dramatic reduction in board space requirements and offers increased reliability in systems using multiple converters. Its pinout is aimed at optimizing board layout with all analog inputs and outputs at one end of the package and all digital inputs at the other. 2. Single- or Dual-Supply Operation. The voltage-mode configuration of the AD7225 allows single-supply operation. The part can also be operated with dual supplies, giving enhanced performance for some parameters. 3. Versatile Interface Logic. The AD7225 has a common 8-bit data bus with individual DAC latches, providing a versatile control architecture for simple interface to microprocessors. The double-buffered interface allows simultaneous update of the four outputs. 4. Separate Reference Input for Each DAC. The AD7225 offers great flexibility in dealing with input signals, with a separate reference input provided for each DAC and each reference having variable input voltage capability. |
Podobny numer części - AD7225KR-REEL |
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Podobny opis - AD7225KR-REEL |
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