EVAL-ADAU1467Z UG-1134
Rev. A (Draft) | Page 19 of 55
Figure 47. Status LEDs
AUXILIARY ADC PINS
The ADAU1467 has a 10-bit, successive approximation
register (SAR) ADC multiplexed across six input channels.
Channel AUXADC0 and Channel AUXADC1 are connected
to linear Potentiometer R1 and Potentiometer R2.
Channel AUXADC2 to Channel AUXADC5 are accessible
on test points next to the ADAU1467. Inputs to the ADCs
between 0 V and 3.3 V can be connected to these pads and then
used in the SigmaStudio signal flow (see Figure 48).
Figure 48. Auxiliary ADC Test Points Communications Header
CONTROLLING VOLUME WITH A POTENTIOMETER
The 10-bit auxiliary analog-to-digital converter (ADC) on the
ADAU1467 eliminates the need for a microcontroller in many
applications by using analog control signals as user interface
devices. For example, the EVA L -ADAU1467Z includes two 10 kΩ
linear potentiometers connected to Auxiliary ADC Channel 0
(AUXADC0) and Auxiliary ADC Channel 1 (AUXADC1).
These potentiometers can be used as an inexpensive, versatile,
and physical way to control parameters such as gain, filter
corner frequency, slew rate, and compression level.
Figure 49. Potentiometers Connected to AUXADC0 and AUXADC1
The following example procedure demonstrates how a
potentiometer can be configured as a stereo volume control.
1. Create a new project in SigmaStudio, and use the Hardware
Configuration tab to set up the ADAU1467 as described in
the
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