LC89075W-H SANYO [Sanyo Semicon Device], LC89075W-H Datasheet - Page 22

• Manufacturer Part Number: LC89075W-H
• Description: Digital Audio Interface Receiver with Stereo ADC and Audio Selector
• Manufacturer: SANYO [Sanyo Semicon Device]

9.6 Analog Audio Data Detection (DSTATE)
• The LC89075W-H can detect the existence (‘Sound’ or ‘Silence’) of analog audio data. ‘Sound’ has the audio data
• The ‘Sound’ detection can be performed in normal operation mode or low sampling rate operation mode.
• The ‘Silence’ detection can be performed in normal operation mode.
• These detections can be performed on the analog data while the ADC is operating. They cannot be performed while
9.6.1 ‘Sound’ Detection
9.6.1.1 Detection in Normal Operation Mode
• To perform detection in normal operation mode, “SDMODE=1” is set.
• Analog to digital conversion is performed at a sampling frequency of 48kHz or 96kHz in master mode, or at the clock
9.6.1.2 Detection in Low Sampling Rate Operation Mode
• Low sampling rate operation mode can be used only when set to master mode. (See section 9.1.3)
• To perform detection in low sampling rate operation mode, “SDMODE=1” and “ADCOPR[1:0]=10” must be set.
• In this mode, analog to digital conversion is performed at a sampling frequency of 6kHz.
• In this operation mode, the following register settings are recommended to reduce current consumption other than by
above threshold level. ‘Silence’ has the audio data below threshold level.
the ADC is in the reset or the power-down status.
frequency input to MPIO[3:1] in slave mode.
the ADC.
0Bh
0Bh
0Ch
00h
00h
01h
02h
05h
06h
Adr
HPF output
Analog
Absolute
DSTATE
Data
value
Register Name
ADCOPR[1:0]
SW2SEL[2:0]
RXTHR1[3:0]
RXDSEL[3:0]
RXTHR2[3:0]
XMSEL[1:0]
SDMODE
OUTMUT
DIROPR
Table 9.6 Recommended Register Settings for the ADC Power Save Mode Operation
DSTATEP=0
ΔΣ
‘Sound’
ADC operation setting
DIR operation setting
Analog or digital audio data detection setting
XMCK pin output setting
Clock and data output setting
MPOUT[4:1] pin output setting
RXOUT output data setting
DIR data demodulation input setting
MPOUT4 output data setting
Figure 9.4 Analog Audio Data Detection Timing
Digital Filter
Register Description
LC89075W-H
YLEVEL[3:0], NLEVEL[3:0]
HPF
Comp.
Recommended Value
‘Silence’
Level judgment
1111
1111
1111
000
10
11
Volume
1
1
1
Digital
-60dB
Power save mode operation
Stop
‘Sound’ detection
“L” output
“L” output
“L” output
“L” output
Connected to GND
“L” output
Output
Remarks
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