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-rw-r--r--source/adc.rst10
-rw-r--r--source/prolog.rst3
2 files changed, 7 insertions, 6 deletions
diff --git a/source/adc.rst b/source/adc.rst
index a749201..18c54ab 100644
--- a/source/adc.rst
+++ b/source/adc.rst
@@ -45,11 +45,11 @@ together, or the same voltage can even be sampled by multiple ADC pins
at the same time.
Another important factor when taking a voltage reading is the
-reference voltages that the sample is being compared against. In the
-case of the Maple, the high reference is |vcc| and the low reference
-is ground. This means that noise or fluctuations on either |vcc| or
-ground will affect the measurement. It also means that the voltage you
-are trying to sample must be between ground and 3.3 V.
+reference voltages that the sample is being compared against. For
+Maple, the high reference is |vdda| and the low reference is ground.
+This means that noise or fluctuations on either |vdda| or ground will
+affect the measurement. It also means that the voltage you are trying
+to sample must be between ground and 3.3 V.
.. _adc-range:
diff --git a/source/prolog.rst b/source/prolog.rst
index 2823947..8606555 100644
--- a/source/prolog.rst
+++ b/source/prolog.rst
@@ -3,5 +3,6 @@
.. recommended by the Sphinx people, who have other ways of doing it.
.. Common substitutions
-.. |vcc| replace:: V\ :sub:`cc`
+.. |vcc| replace:: V\ :sub:`CC`
+.. |vdda| replace:: V\ :sub:`DDA`
.. |i2c| replace:: I\ :sup:`2`\ C