Analog Devices EVAL-ADUSB2EBZ, Руководство пользователя

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UG-477 Evaluation Board User Guide
Rev. A | Page 10 of 28
USING THE EVALUATION BOARD
POWER
Power can be supplied to the EVAL-ADAU1772Z in one of
three ways. When Jumper J3 is in the USB/EXT position, power
can be supplied by connecting the
EVAL-ADUSB2EBZ (USBi)
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.
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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
. The on-board
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).
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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.
Analog Microphone Inputs
For microphone signals, the ADAU1772 analog inputs can be
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).
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Figure 32. Microphone Bias Headers
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).
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Figure 33. Microphone Bias Enable and Gain