HD49330AF/AHF

Rev.1.0, Apr.05.2004, page 9 of 19

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

L

[0]

2.20 nsec

(72 MHz)

2.30 nsec

(69 MHz)

L

[1]

L

[2]

L

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)

[3]

H

[0]

L

[1]

L

[2]

L

[3]

L

[0]

H

[1]

L

[2]

L

[3]

H

[0]

H

[1]

L

[2]

L

[3]

L

[0]

L

[1]

H

[2]

L

[3]

H

[0]

L

[1]

H

[2]

L

[3]

L

[0]

H

[1]

H

[2]

L

[3]

H

[0]

H

[1]

H

[2]

L

[3]

L

[0]

SHSW-fsel (Register setting)

4.40 nsec

(36 MHz)

4.80 nsec

(33 MHz)

L

[1]

L

[2]

H

CR Time Constant (Typ)

(cutoff frequency conversion)

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)

[3]

H

[0]

L

[1]

L

[2]

H

[3]

L

[0]

H

[1]

L

[2]

H

[3]

H

[0]

H

[1]

L

[2]

H

[3]

L

[0]

L

[1]

H

[2]

H

[3]

H

[0]

L

[1]

H

[2]

H

[3]

L

[0]

H

[1]

H

[2]

H

[3]

H

[0]

H

[1]

H

[2]

H

[3]

BLKC

C4

31

The SHAMP frequency characteristics can be adjusted by changing the register settings

and the C4 value of the external 31st pin.

The settings are shown in table 7.

Values other than those shown in the table 7 cannot be used.

8.

SHSW-fsel (Register setting)

CR Time Constant (Typ)

(cutoff frequency conversion)

Table 7

SHAMP Frequency Characteristics Setting

49 MHz

15000 pF

(620 pF)

24 MHz

27000 pF

(820 pF)

32 MHz

22000 pF

(750 pF)

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)

56 MHz

18000 pF

(360 pF)

116 MHz

10000 pF

(270 pF)

"Lo"

"Hi"

75 MHz

13000 pF

(300 pF)

H

[0]

L

[1]

L

[0]

H

[1]

H

[0]

H

[1]