Using The Evaluation Board; Power; Inputs And Outputs - Analog Devices EVAL-ADAU1772Z User Manual

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USING THE EVALUATION BOARD

POWER

Power can be supplied to the
three ways. When Jumper J3 is in the USB/EXT position, power
can be supplied by connecting the
board connected to J1 (see Figure 30) or by connecting a tip
positive 3.8 V dc to 6 V dc power supply on J2.
Figure 30. Header J1, Control Port
To supply power via a 1.5 V battery, J3 must be set to the BATT
position, and the battery must be connected to J5
regulator generates the 3.3 V dc or 1.8 V dc supply, determined
by S1, for the on-board circuitry. LED D1 lights up when power
is supplied to the board. To connect power to the ADAU1772,
connect the J8, J10, J12, and J17 jumpers (see Figure 31).
Figure 31. Power Jumpers

INPUTS AND OUTPUTS

The EVAL-ADAU1772Z has multiple audio input and output
options, including digital and analog. There are four single-ended
analog inputs that are configurable as microphone or line inputs,
dual stereo digital microphone inputs, and two differential outputs
that can also be used in a single-ended configuration.
EVAL-ADAU1772Z in one of
EVAL-ADUSB2EBZ (USBi)
. The on-board
Analog Microphone Inputs
For microphone signals, the
configured as single-ended inputs with optional programmable
gain amplifier (PGA) mode.
Microphone Bias
To add MBIAS0 to AIN0, connect a jumper to the J11 header.
Similarly, MBIAS1 or MBIAS0 can be added to AIN1 by
connecting a jumper to the J14 header (see Figure 32).
Enable the microphone bias circuitry in the PGA/ADC tab of
SigmaStudio to use it. The appropriate gain settings can also be
chosen here (see Figure 33).
Figure 33. Microphone Bias Enable and Gain
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Evaluation Board User Guide
ADAU1772 analog inputs can be
Figure 32. Microphone Bias Headers