A 537 KB PDF datasheet for the AD7542 from Analog Devices, a 12-bit multiplying DAC designed to load data from a 4-bit microprocessor bus in nibble form. It covers pin assignment, register loading sequence, reference input, output current connections and timing. Repair use centres on older instrumentation and controllers: checking the reference and supply, probing the data and control strobes, and confirming the external op amp stage. Make sure the grade and package printed on the chip match before fitting a substitute.
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