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2个8位PWM实现16位DAC
资料介绍
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.
部分文件列表
文件名 | 大小 |
2个8位PWM实现16位DAC.pdf | 1M |
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