MN66279RSC Datasheet, PDF (43/96 Pages) Panasonic Semiconductor – LSI FOR COMPACT DISC/CD ROM PLAYER

MN662790RSC
(F)-14ɹSetting of automatic adjustment range


The limits of adjustment values can be set arbitrarily in the range of 1/128 to 255/16 (or ʵ42 dB to ʴ24 dB).
In order to ensure automatic gain convergence within a limited, narrow adjustment range to prevent
excessive gain change, which has difficulty in convergence control, however, make sure that the maximum
automatic adjustment range is ʶ9 dB on the basis of the gain set value.
ɾTracking gain
ɹAutomatic adjustment rangeɹɹɹGLT3/GLT4 to GLT1/GLT2
Data (8 bits)
Address
(8 bits)
Command
(HEX)
(B7 to B0)
Function
Table 7-1-3 (30)
Setting
at reset
D7 D6 D5 D4 D3 D2 D1 D0 3D
D7 D6 D5 D4 D3 D2 D1 D0 ^3E
F2
Tracking gain upper limit
ɹGLT1 (mantissa) (128 to 255)
181
ɹGLT2 (exponent) (128, 64, 32, 16)
32
D7 D6 D5 D4 D3 D2 D1 D0 3F
D7 D6 D5 D4 D3 D2 D1 D0 40
Tracking gain lower limit
ɹGLT3 (mantissa) (128 to 255)
91
ɹGLT4 (exponent) (128, 64, 32, 16)
128
ɹɹɹɹ GLT1 and GLT3 can be both set to 127 or a smaller value only if GLT2 and GLT4 are both set to 128.
ɾFocus gain
ɹAutomatic adjustment rangeɹɹɹGLF3/GLF4 to GLF1/GLF2
Table 7-1-3 (31)
Data (8 bits)
Address
(8 bits)
Command
(HEX)
(B7 to B0)
Function
Setting
at reset
D7 D6 D5 D4 D3 D2 D1 D0 39
D7 D6 D5 D4 D3 D2 D1 D0 3A
F2
Focus gain upper limit
ɹGLF1 (mantissa) (128 to 255)
181
ɹGLF2 (exponent) (128, 64, 32, 16)
16
D7 D6 D5 D4 D3 D2 D1 D0 3B
D7 D6 D5 D4 D3 D2 D1 D0 ^3C
Focus gain lower limit
ɹGLF3 (mantissa) (128 to 255)
181
ɹGLF4 (exponent) (128, 64, 32, 16)
128
ɹɹɹɹGLF1 and GLF3 can be both set to 127 or a smaller value only if GLF2 and GLF4 are both set to 128.
SDD00025AEM
43