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Circuit Description
2-6
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When that time is reached, the control portion of the event timing and control register will start the baseband receive
section converting I and Q sample pairs. The samples are stored in a double-buffered register until the register contains 32
sample pairs. CSP2200 then notifies the DSP which has sample time to read the information out before the next 32
sample pairs are stored. The voice band ADC converter issues an interrupt to the DSP whenever it finishes converting a
16-bit PCM word. The DSP then reads the new input sample and simultaneously loads the voice band output DAC
converter with a new PCM output word. The voice band output can be connected directly to a speaker via AOUTAN and
AOUTAP pins and be connected to a Ear-mic speaker via AOUTBN and AOUTBP pins.
There are 7 LDOs which are power sources of microprocessor, LCD, etc. These 7 LDOs output are programmable.