Generating Waveforms; Output Dac - HP E1340A User Manual

Generating Waveforms

Output DAC

Chapter 9
Figure 9-1. Arbitrary Waveform
Refer to Figure 9-2. The following describes the blocks that generate
waveforms.
The AFG uses a 12-bit DAC to generate the waveforms. Each time the
AFG's frequency generator clocks the DAC latch, the DAC outputs a
voltage value that corresponds to the point value in memory. The bits set in
the DAC determine the voltage value. The DAC codes in memory set the
appropriate bits of the DAC. The RAM receives its data either from
EPROMs or over the VXIbus through a register.
Besides receiving data from memory, the DAC can also receive segment
data directly over the VXIbus. In this case, the data on the VXIbus
immediately set the DAC to an output voltage that corresponds to the DAC
code value sent. Each time the DAC receives a new code, the DAC's output
is set to the value in the new code. Thus, the waveform frequency depends
on the rate at which the DAC receives the codes.
The output DAC's voltage range is from -5.12 V to +5.1175 V.
HP E1340A Block Diagram Description 212