參數(shù)資料
型號(hào)： TB1254N
廠商： Toshiba Corporation
英文描述： PAL / NTSC / SECAM 1CHIP (IF+VCD PROCESSOR) IC
中文描述： PAL / NTSC制式/ SECAM制式1CHIP（中頻光碟處理器）芯片
文件頁數(shù)： 37/58頁
文件大?。?/td> 551K
代理商： TB1254N
Ver3.7
00/01/28
37
VIDEO stage
(RGB Mute:0 / R cut off:127 / DC rest.:10)
Note
Items/Symbols
V1
TV Input Dynamic
Range
/ DR
TV
External Input
Dynamic Range
/ DR
EXT
V2
TV Mode Gain
/ G
TV
Ext. Mode Gain
/ G
EXT
Bus conditoins
Video SW:00/01
Others:Preset
Measurement methods
(1)Input a white signal with sync into Pin46(EXT IN)&48(TV IN).
(2)Increasing the input amplitude, measure the amplitude(include
sync) at
which the Pin41(MON OUT) output is clipped, that is
"DR
TV
"(Video SW:00) / "DR
EXT
"(Video SW:01).
Video
Others:Preset
SW:00/01
(1)Input a 1Vp-p, white signal with sync into Pin46(EXT
IN)&48(TV IN).
(2)Set Video SW to 00 and measure the gain between PIN48 and
Pin41(MON OUT), that is "G
TV
".
(3)Set Video SW to 01 and measure the gain between Pin46 and
Pin41, that is "G
EXT
".
(1)Input a PAL red signal with sync into Pin48(TV IN) and
connect Pin46(EXT IN) to GND via a 1uF capacitor.
(2)Set Video SW 01, measure the amplitude of 4.43MHz signal at
Pin41 and calculate the cross-talk, that is "CT
SWTE
".
(3)Input a PAL red signal with sync into Pin46 and connect Pin48
to GND via a 1uF capacitor.
(4)Set Video SW 00, measure the the amplitude of 4.43MHz
signal at Pin41 and calculate the cross-talk, that is "CT
SWET
".
(1)Input a white signal with sync into Pin38&39.
(2)Increasing the Pin39 input amplitude, measure the amplitude
(includesync) at which the Pin20 output is clipped, that is
"DR
Y
".
V3
AV SW Cross-Talk
/ CT
SWTE
/ CT
SWET
Video
Others:Preset
SW:00/01
V4
Y Input Dynamic
Range
/ DR
Y
WPS:1
Uni-Color:63
Brightness:0
Color:0
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
RGB Mute:0
R cut off:63
DC rest.:10
Uni-Color:127
Sharpness:Adjust
Color:0
Others:Preset
Uni-Color:127
Color:0
Y DL:000/001/111
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
V5
Y Input Pedestal
Clamp Voltage
/ V
YCLP
(1)Input a composite sync signal into Pin38.
(2)Connect Pin39 to GND via a 1uF capacitor.
(3)Measure the DC Voltage at Pin39, that is "V
YCLP
".
V6
Y Frequency
Response
/ FR
Y
(1)Input a 0.5Vp-p sweep signal with sync into Pin38&39.
(2)Adjust Sharpness so that the output amplitude for FSHP
equals V
SH100k
.
(3)Measure the frequency at which the output amplitude is 3dB
down
against V
SH100k
, which is "FR
Y
".
V7
Y Delay Time
/ t
YDEL
/
t
YDEL-40
/
t
YDEL+240
/
t
YDEL
(1) nput a 2T pulse with sync into Pin38&39.
(2) Set the BUS data so that Y DL is 0ns(001).Observe the Pin20
output, measure the delay time between Pin39 and Pin20, that
is "t
YDEL
".
(3) Set the BUS data so that Y DL is –40ns(000). Observe the
Pin20 output, measure the delay time between Pin39 and
Pin20, that is t
YDEL-40
.
(4) Set the BUS data so that Y DL is +240ns(111). Observe the
Pin20 output, measure the delay time between Pin39 and
Pin20, that is t
YDEL+240
.
(5)Calculate, “
t
YDEL-40
”= t
YDEL-40
- "t
YDEL
"
“
t
YDEL+240
”= t
YDEL+240
- "t
YDEL
"
“
t
YDEL
”= (“
t
YDEL+240
”- “
t
YDEL-40
”)/7
V8
Brightness
Characteristics
/ V
BRTMAX
/ V
BRTCEN
/ V
BRTMIN
Brightness Data
Sensitivity
/
V
BRT
Brightness:
0/64/127
Color:0
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
(1)Input a 0IRE black signal with sync into Pin38&39.
(2)Measure the DC level of picture period at Pin20 for
Brightness:127/64/0,
that is "V
BRTMAX
" / "V
BRTCEN
" / "V
BRTMIN
".
(3)Calculate;"
V
BRT
"=(V
BRTMAX
-V
BRTMIN
)/127
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