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Chapter 5 analog output, Analog output circuitry, Analog output circuitry -1 – National Instruments NI 6238 User Manual

Page 52: Analog output

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5-1

NI 6238/6239 User Manual

5

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.

Figure 5-1. NI 6238/6239 Analog Current Output Circuitry

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

AO 1

AO POWER SUPPLY

DAC0

AO FIFO

Isolation

Barrier

AO 0

V-I Converter

V-I Converter

AO Sample Clock

AO GND

DAC1

Digital

Isolators

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