Pepper Computer RS232, RS485 user manual Output Circuitry, SM-DAD1 Output Schematic Diagram

Chapter 5 Analog Modules SMART I/O User’s Manual

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

System

Interface

DAC

Ref

Output

Amplifier

Uni-/Bipolar

Switch

(J4/J5)

VOUTx

AGND

Load

-10V .. +10V

0 .. +10V

5

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.

March 12, 1996 ©1996 PEP Modular Computers GmbH Page 5 - 11