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Testing 10 Bit DAC's on Automatic Testers

IP.com Disclosure Number: IPCOM000086290D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Lebesnerais, G: AUTHOR

Abstract

The principle of the test is represented in the figure. A special board containing a 12-bit precision reference digital analog converter (DAC) 10, a sample and hold circuit 11, a differential amplifier 12, and an amplifier 13, is built and attached to the tester.

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Testing 10 Bit DAC's on Automatic Testers

The principle of the test is represented in the figure. A special board containing a 12-bit precision reference digital analog converter (DAC) 10, a sample and hold circuit 11, a differential amplifier 12, and an amplifier 13, is built and attached to the tester.

The 10-bit DAC 14 to be tested is connected to these circuits in the manner represented in the figure.

The tester is automatically programmed for the following steps: 1) close the loop (sample function) with all digital inputs at "1" this means that the output of the two DAC's 10 and 14 corresponds to the full scale; 2) open the loop (Hold function): and 3) change the digital input word, and read the difference in voltage between the reference DAC 10 and the DAC 14 to be tested for a plurality of logical word combinations.

The voltage measured at the output of the differential amplifier 12 is characteristic of the precision of the DAC 14 under test. With this method there is no need to make any manual adjustments. It allows the test of 10-bit DAC'S, with standard automatic testers usually limited to the test of 8-bit precision DAC'S.

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