Theory of Operation 4
Keysight E3631A Service Guide 101
D-to-A Converter
All reference voltages of power circuits are derived from the internal voltage
reference of system DAC U12 on the top board. The system DAC track/hold
amplifier outputs are used to provide controllable reference voltages to three
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 mutiplexed to 6 track/hold amplifiers through U13 on the top
board. Each track/hold amplifier is refreshed approximately every 13 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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