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HD49335NP/HNP
Rev.1.0, Feb.12.2004, page 9 of 29
7. Adjustment of Black-Level S/H Response Frequency Characteristics
The CR time constant that is used for sampling/hold (S/H) at the black level can be adjusted by changing the
register settings, as shown in table 6.
Table 6 SHSW CR Time Constant Setting
31
BLKC
C
Recommendation value of C is 1000 pF
The SHAMP frequency characteristics can be adjusted by changing the register settings
and the C4 value of the external pin.
The settings are shown in table 7.
Values other than those shown in the table 7 cannot be used.
8.
2.20 nsec
(72 MHz)
2.30 nsec
(69 MHz)
2.51 nsec
(63 MHz)
2.64 nsec
(60 MHz)
2.93 nsec
(54 MHz)
3.11 nsec
(51 MHz)
3.52 nsec
(45 MHz)
3.77 nsec
(42 MHz)
L
[3]
L
[0]
L
[0]
4.40 nsec
(36 MHz)
4.80 nsec
(33 MHz)
L
[1]
L
[1]
L
[2]
L
[2]
5.87 nsec
(27 MHz)
6.60 nsec
(24 MHz)
8.80 nsec
(18 MHz)
10.6 nsec
(15 MHz)
17.6 nsec
(9 MHz)
26.4 nsec
(6 MHz)
L
[3]
H
[3]
H
[0]
H
[0]
L
[1]
L
[1]
L
[2]
L
[2]
L
[3]
H
[3]
L
[0]
L
[0]
H
[1]
H
[1]
L
[2]
L
[2]
L
[3]
H
[3]
H
[0]
H
[0]
H
[1]
H
[1]
L
[2]
L
[2]
L
[3]
H
[3]
L
[0]
L
[0]
L
[1]
L
[1]
H
[2]
H
[2]
L
[3]
H
[3]
H
[0]
H
[0]
L
[1]
L
[1]
H
[2]
H
[2]
L
[3]
H
[3]
L
[0]
L
[0]
H
[1]
H
[1]
H
[2]
H
[2]
L
[3]
H
[3]
H
[0]
H
[0]
H
[1]
H
[1]
H
[2]
H
[2]
H
[3]
SHSW-fsel (Register setting)
SHSW-fsel (Register setting)
CR Time Constant (Typ)
(cutoff frequency conversion)
CR Time Constant (Typ)
(cutoff frequency conversion)
Table 7 SHAMP Frequency Characteristics Setting
230 MHz
6800 pF
(240 pF)
56 MHz
18000 pF
(360 pF)
116 MHz
10000 pF
(270 pF)
100 MHz
10000 pF
(560 pF)
"Lo"
"Hi" 24 MHz
27000 pF
(820 pF)
75 MHz
13000 pF
(300 pF)
32 MHz
22000 pF
(750 pF)
49 MHz
15000 pF
(620 pF)
L
[0]
H
[0]
L
[1]
L
[1]
L
[0]
H
[1]
H
[0]
H
[1]
SHA-fsel (Register setting)
LoPwr
(Register setting)
Note: Upper line
Middle line
Lower line
: SHAMP cutoff frequency (Typ)
: Standard value of C4 (maximum value is not defined)
: Minimum value of C4 (do not set below this value)