Analog Devices ADSP-21369 Electret Microphone Select Switch SW4, Uart Enable Switch SW5

EZ-KIT Lite Hardware Reference

ADSP-21369 Processor AD1835A Codec

DAI_P6

DAI_P17

MCLK

12.288MHz

OSC

SW3.1

SW3.2

Figure 2-5. Audio Clock Routing

Position 4 of SW3 disconnects the AD1835A’s ADC_DATA pin from the DAI interface. This is useful when the DAI interface connects to another device.

Electret Microphone Select Switch (SW4)

To connect an electret microphone to the audio input, place all positions of the SW4 switch ON. The default position of the switch is all OFF. When all of the positions are in the ON position, a DC offset of 2.5V is added to the signal, and gain of the input amplifiers is changed from 1x to 10x.

UART Enable Switch (SW5)

The UART enable switch (SW5) disconnects UART signals from the DPI pins of the processor. When the switch is in the OFF position, the associ- ated DPI signal (see Table 2-5) can be used on the expansion interface.

ADSP-21369 EZ-KIT Lite Evaluation System Manual 2-11