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Chapter 4
Signal Connections
6711/6713/6715 User Manual
4-8
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For an external reference at 5 V, you can output ±5 V with the LSB on a
voltage output reduced to 2.44 mV. This gives you a higher resolution at
lower voltage.
You must configure each analog output channel individually for external
reference selection in order for the signal applied at the external reference
input to be used by that channel. If you do not specify an external reference,
the channel will use the internal reference. Analog output configuration
options are explained in the
Analog Output
section in Chapter 3,
Hardware
Overview
. The following ranges and ratings apply to the EXTREF input:
•
Usable input voltage range: ±11 V peak with respect to AOGND
•
Absolute maximum ratings: ±15 V peak with respect to AOGND
AOGND is the ground reference signal for the analog output channels.
DAC<0..7>OUT as well as EXTREF is referenced to AOGND.
The external reference signal can be either a DC or an AC signal. The
device multiplies this reference signal by the DAC code, divided by the
full-scale DAC code, to generate the output voltage.
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