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AD7538JN Datasheet(PDF) 1 Page - Analog Devices |
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AD7538JN Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page LC2MOS Microprocessor-Compatible 14-Bit DAC AD7538 Rev. B 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 ©2009 Analog Devices, Inc. All rights reserved. FEATURES All grades 14-bit monotonic over the full temperature range Low cost, 14-bit upgrade for 12-bit systems 14-bit parallel load with double buffered inputs Small 24-pin, 0.30” DIP and SOIC Low output leakage (<20 nA) over the full temperature range APPLICATIONS Microprocessor-based control systems Digital audio Precision servo control Control and measurement in high temperature environments FUNCTIONAL BLOCK DIAGRAM 2 23 1 3 4 20 21 22 24 5 619 14-BIT DAC DAC REGISTER INPUT REGISTER 14 AD7538 DB13 TO DB0 DGND VDD VSS WR CS LDAC AGND IOUT VREF RFB Figure 1. GENERAL DESCRIPTION The AD7538 is a 14-bit monolithic CMOS digital-to-analog converter (DAC) that uses laser trimmed thin-film resistors to achieve excellent linearity. The DAC is loaded by a single 14-bit wide word using standard chip select and memory write logic. Double buffering, which is optional using LDAC, allows simultaneous updates in a system containing multiple AD7538s. A novel low leakage configuration enables the AD7538 to exhibit excellent output leakage current characteristics over the specified temperature range. The AD7538 is manufactured using the linear-compatible CMOS (LC2MOS) process. It is speed compatible with most microprocessors and accepts TTL or CMOS logic level inputs. PRODUCT HIGHLIGHTS 1. Guaranteed Monotonicity. The AD7538 is guaranteed monotonic to 14-bits over the full temperature range for all grades. 2. Low Cost. The AD7538, with its 14-bit dynamic range, affords a low cost solution for 12-bit system upgrades. 3. Small Package Size. The AD7538 is packaged in a small 24-pin, 0.3" DIP and a 24-pin SOIC. 4. Low Output Leakage. By tying VSS (Pin 24) to a negative voltage, it is possible to achieve a low output leakage current at high temperatures. 5. Wide Power Supply Tolerance. The device operates on a +12 V to +15 V VDD, with a ±5% tolerance on this nominal figure. All specifications are guaranteed over this range. |
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