LA76810A
Continued from preceding page.
Input signal
Symbol
TINT+
Test point
21
Input signal
Test method
Bus bit/input signal
Tint variable range (+)
C-1
Measure each part of the output level and
calculate the B-Y axis angle.
TINT
1111111
TINT+ = B-Y axis angle -TINCEN
Measure each part of the output level and
calculate the B-Y axis angle.
Tint variable range (-)
TINT-
C-1
TINT
0000000
21
TINT- = B-Y axis angle -TINCEN
[Filter Block Chroma BPF Characteristic]
Test point
Input signal
Symbol
Input signal
Test method
Bus bit/input signal
C-BPF1A
CBPF1A
C-3
PAL signal
Set the chroma frequency (CW) to
4.433619MHz-100kHz and measure V0 output
amplitude. And then, set the chroma frequency
(CW) to 3.93MHz and measure V1 output
amplitude to calculate as follows:
FILTER SYS = 0010
C.BYPASS = 0
21
Peaker amplitude
characteristic
3.93MHz
CBPF1A = 20LOG (V1/V0)
C-BPF1B
CBPF1B
C-3
PAL signal
Measure V2 output amplitude when the chroma
frequency (CW) is 4.13MHz and V3 output
amplitude when it (CW) is 4.73MHz to calculate
as follows:
FILTER SYS = 0010
C.BYPASS = 0
21
Peaker amplitude
characteristic
4.73/4.13MHz
CBPF1B = 20LOG (V3/V2)
C-BPF1C
CBPF1C
CBPF2A
C-3
PAL signal
Set the chroma frequency (CW) to 4.93MHz and
measure V4 output amplitude to calculate as
follows:
FILTER SYS = 0010
C.BYPASS = 0
21
21
Peaker amplitude
characteristic
4.93/3.93MHz
C-BPF2A
BandPass
amplitude
CBPF1C = 20LOG (V4/V1)
C-3
PAL signal
Set the chroma frequency (CW) to
4.433619MHz-100MHz and measure V00 output
amplitude. And then, set the chroma frequency
(CW) to 3.93MHz and measure V10 output
amplitude to calculate as follows:
FILTER SYS = 0011
C.BYPASS = 0
characteristic
3.93MHz
CBPF2A = 20LOG (V10/V00)
www.DataSheet4U.com
C-BPF2B
BandPass
amplitude
characteristic
4.73/4.13MHz
C-BPF2C
BandPass
amplitude
CBPF2B
CBPF2C
C-3
Measure V20 output amplitude when the chroma
frequency (CW) is 4.13MHz and V30 output
amplitude when it (CW) is 4.73MHz to calculate
as follows:
FILTER SYS = 0011
C.BYPASS = 0
21
21
PAL signal
CBPF2B = 20LOG (V30/V20)
C-3
Set the chroma frequency (CW) to 4.93MHz and
measure V40 output amplitude to calculate as
follows:
FILTER SYS = 0011
C.BYPASS = 0
PAL signal
characteristic
4.93/3.93MHz
CBPF2C = 20LOG (V40/V10)
NoA0252-21/40
SANYO [ SANYO SEMICON DEVICE ]
