User`s guide

1/15/03 14-1
Chapter 14
Analog Outputs (DAC)
14.1 Theory of Operation
The LZ87010 has two identical 8-bit digital-to-analog converters (DACs), DAC0 and DAC1.
Each DAC has an associated waveform generator with 128 bytes of RAM. Figure 14-1
shows a block diagram of one DAC and waveform generator.
14.1.1 Digital-to-Analog Converter (DAC)
The DAC is implemented as a pair of 4-bit static sub-ranging DACs with power-down. It
consists of input decoders, coarse and fine resolution resistor networks and an output
buffer amplifier.The maximum voltage of the output is set by the voltage reference
DAVREF relative to VSSA. The DAC’s maximum settling time is 0.45 µs (99.9%).