Analog Output; Analog Output Circuitry - National Instruments PXI-6238 User Manual

Analog Output

NI 6238/6239 devices have two AO channels controlled by a single clock
and capable of waveform generation. Figure 5-1 shows the analog current
output circuitry of NI 6238 and NI 6239 devices.
AO POWER SUPPLY
AO 0
AO 1
AO GND

Analog Output Circuitry

DACs
Digital-to-analog converters (DACs) convert digital codes to analog
voltages.
V-I Converter
The V-I converter converts voltage (V) into current (I).
AO FIFO
The AO FIFO enables analog output waveform generation. It is a
first-in-first-out (FIFO) memory buffer between the computer and the
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V-I Converter
DAC0
V-I Converter
DAC1
Figure 5-1. NI 6238/6239 Analog Current Output Circuitry
5-1
5
Isolation
Barrier
Digital
AO FIFO
Isolators
AO Sample Clock
NI 6238/6239 User Manual