Agilent Technologies 81689A Guía de usuario Pagina 92

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Chapter 4 Theory of Operation
D-to-A Converter
92
D-to-A Converter
All reference voltages of power circuits are derived from the internal voltage reference
of system DAC U22. The system DAC track/hold amplifier outputs are used to
provide controllable reference voltages to power circuits. The system DAC is
programmed and responds to the main controller via internal 3-wire serial data bus
SERCLK, SERRBK, and SERSTB. The system DAC is multiplexed to 6 track/hold
amplifiers through U26. Each track/hold amplifier is refreshed approximately every
1 msec to maintain its output setting. Changes to track/hold amplifier outputs are
accomplished by dwelling on that position for an extended period.
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