ADC-44D Datasheet, PDF (24/66 Pages) List of Unclassifed Manufacturers – Multi-Function Analogue Input/Output Card

Page 16
I/O Connections
Chapter 4
Analogue Voltage Outputs
The analogue output signals from the ADC-44d are available as voltages and
current sinks simultaneously.
Each of the four output signals (Vout0 to Vout3) has a corresponding analogue
ground or 0 Volt connection. The voltage outputs are referenced to these
connections. Measuring output voltages with reference to other ground points
(particularly the digital ground) will give electrically noisy results.
The voltage output has a span from +10 Volts to -10 Volts with an output drive
of 10mA maximum for any single output and 5mA maximum each for all
outputs simultaneously.
If large capacitive loads are to be connected to the voltage output, it is
recommended that a series resistance of approximately 100 ohms is placed in
series with the output voltage to avoid oscillations occurring at the output.
All outputs are disabled following a power on and will be set to 0 Volts and
0 mA. Writing 0 to the DAC control register bit 2 at address Base + 1, or
issuing a master reset (a read from Base + 0) will also disable the outputs.
This is a safety feature and also allows the outputs to be pre-set to a specific
value prior to enabling them. This is accomplished by writing a logic 1 to bit 2
of the DAC control register.