3-7
DA_DATA
IC402
OP-
AMP
DA_XCK
DA_BCK
DA_LRCK
Analog
audio
IC501
MPEG
(ZIVA5.0)
IC401
DAC
IC401 is called as Audio DAC, DAC means Digital-
Analog Convertor.
This IC receives digital signal from MPEG and con-
vert digital signal to analog signal, so we can hear
sound…
IC401 is connected with OP - AMP and an analog
Audio signal is amplified at the OP - A MP.
because the analog audio signal from DAC is a
very low level.
DA_XCK : this is the system clock for IC401
DA_BCK : this is standard clock to synchronize the
audio serial data
DA_LRCK : R-chanel and L-chanel are selected
among the audio serial data by this
DA_DATA : serial audio data
DA_XCK
DA_BCK
DA_LRCK
DA_DATA
Pin 7 and pin 47 of IC20, pin202 of IC501 and pin 11 of IC202 are related to RESET.
We can know whether IC is intialized or not through those ports.
The waveform shows the status when the reset signal works normally.
If the /M-RESET is abnormal, then check the front u-com(IC901) and replace it
/M-RESET (Pin202 of IC501)
DSP_RST (Pin 47 of IC201)
/M-RESET (Pin 11 of IC202)
3.3V power input
The waveform when power on
11. Checking the output of Audio signal
12. Checking the reset port