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Chapter 16 d/a converter, 1 d/a converter functions – NEC uPD78P078 User Manual

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CHAPTER 16 D/A CONVERTER

16.1 D/A Converter Functions

The D/A converter converts a digital input into an analog value. It consists of two 8-bit resolution channels of

voltage output type D/A converter.

The conversion method used is the R-2R resistor ladder method.

Start the A/D conversion by setting the DACE0 and DACE1 of the D/A converter mode register (DAM).

There are two types of modes for the D/A converter, as follows.

(1) Normal mode

Outputs an analog voltage signal immediately after the D/A conversion.

(2) Real-time output mode

Outputs an analog voltage signal synchronously with the output trigger after the D/A conversion.

Since a sine wave can be generated in the mode, the use of this mode easily realizes an MSK modem for

cordless telephone sets.

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