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2个8位PWM实现16位DAC

更新时间:2019-11-18 15:02:09 大小:1M 上传用户:xuzhen1查看TA发布的资源 浏览次数:348 下载积分:0分 出售积分赚钱 评价赚积分 ( 如何评价?) 标签:pwmdac 收藏 评论(0) 举报

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INEXPENSIVE,16-BIT, monolithic DACs can serve almost all applications.

However, some applications require unconventional approaches. This Design Idea design concerns circuitry I recently designed for a tunable-diode laser spec-trometer for a Mars-exploration applica-

tion. The control circuitry included two 16-bit DACs that interface to the radia-tion-hardened,8051-variant 69RH051A microcontroller. Because of the intend-ed space-flight-qualified specification, everything in the design had to consist solely of components from the NPSL(NASA parts-selection list). This restric-tion posed a challenge, because, at design finalization, the NPSL included no ap-propriate, flight-qualified,16-bit DACs, and the budget included no funds for cer-tification of new devices.I escaped from this impasse by exploiting two fortuitous facts: The update rate of the two DACs was only tens of hertz, and the 69RH-051A had a number of uncommitted,8-bit,14.5-kHz PWM outputs. 

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2个8位PWM实现16位DAC.pdf 1M

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