AD7538

LC2MOS Microprocessor-Compatible 14-Bit DAC AD7538 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 AD7538 VDD 23 2 RFB VREF 1 14-BIT DAC 3 IOUT 4 AGND DAC REGISTER 20 LDAC INPUT REGISTER 14 6 19 DB13 TO DB0 5 DGND Figure 1. 21 CS 22 WR 24 VSS 01139-001 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 s...