Pepper-computer Modular Computers RS485 Manual do Utilizador descarregar pdf (Página 167)

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101

SMART I/O User’s Manual

Chapter 5 Analog Modules

5.1.5.2 Output Circuitry

The digital to analog converter (DAC) section consists of a twin output 12-

bit DAC with external (on-board) 10.0V reference and an operational

amplifier for unipolar/bipolar outputs.

Figure 5.1.5.2: SM-DAD1 Output Schematic Diagram

Load

-10V .. +10V

0 .. +10V

AGND

VOUTx

Output

Amplifier

Uni-/Bipolar

Switch

(J4/J5)

DAC

Ref

System

Interface

The DAC is a complete dual 12-bit multiplying DAC without the need for

external trimming. Bipolar/unipolar mode is selected via jumpers J4 and J5

which allow both output channels to be configured separately.

It should be noted that in bipolar mode, the power-up condition is not glitch

free. Therefore it is suggested that the connected load be switched a short

time later to provide enough time for the DAC to initialize.

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