LC78622NE Datasheet, PDF (19/31 Pages) Sanyo Semicon Device – Compact Disc Player DSP

LC78622NE
11. Bilingual Function
MSB
LSB
00101000
00101001
00101010
Command
STO CONT
Lch CONT
Rch CONT
RES = low
q
• Following a reset or when a stereo (28H) command has been issued, the left and right channel data is output to the
left and right channels respectively.
• When an Lch set (29H) command is issued, the left and right channels both output the left channel data.
• When an Rch set (2AH) command is issued, the left and right channels both output the right channel data.
12. De-Emphasis; Pin 29: EMPH/CONT6
The preemphasis on/off bit in the subcode Q control information is output from the EMPH pin. When this pin is
high, the LC78622NE internal de-emphasis circuit operates and the digital filters and the D/A converter output de-
emphasized data.
13. Digital Attenuator
Digital attenuation can be applied to the audio data by setting the RWC pin high and inputting the corresponding
two-byte command to the COIN pin in synchronization with the CQCK clock.
MSB
LSB
10000001
10000010
10000011
10000100
10000101
10000110
10000111
Command
ATT DATA SET
ATT 4 STEP UP
ATT 4 STEP DOWN
ATT 8 STEP UP
ATT 8 STEP DOWN
ATT 16 STEP UP
ATT 16 STEP DOWN
RES = low
DATA 00H set
(MUTE –∞ dB)
• Attenuation setup
Since the attenuation level is set to the muted state (a muting of –∞ is specified by an attenuation coefficient of
00H) after the attenuation level is reset, the attenuation coefficient must be directly set to EEH (using the ATT
DATA SET command) to output audio signals. Note that the attenuation level can be set to one of 239 values from
00H to EEH.
These two-byte commands differ from the two-byte commands used for track counting in that it is only necessary
to set RWC once and a two-byte command reset is not required. After inputting the target attenuation level as a
value in the range 00H to EEH, sending an attenuator step up/down command will cause the attenuation level to
approach the target value in steps of 4, 8, or 16 units as specified in synchronization with rising edges on the LRSY
input. However, the ATT DATA SET command sets the target value directly. If a new data value is input during
the transition, the value begins to approach the new target value at that point. Note that the UP/DOWN distinction
is significant here.
No. 6015-19/31