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| 型號： | TB1254N |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP56 |
| 封裝： | 0.600 INCH, PLASTIC, SDIP-56 |
| 文件頁數(shù)： | 31/58頁 |
| 文件大小： | 526K |
| 代理商： | TB1254N |
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Ver3.7
00/01/28 37
VIDEO stage (RGB Mute:0 / R cut off:127 / DC rest.:10)
Note
Items/Symbols
Bus conditoins
Measurement methods
V1
TV Input Dynamic
Range
/ DRTV
External Input
Dynamic Range
/ DREXT
Video SW:00/01
Others:Preset
(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
"DRTV"(Video SW:00) / "DREXT"(Video SW:01).
V2
TV Mode Gain
/ GTV
Ext. Mode Gain
/ GEXT
Video
SW:00/01
Others:Preset
(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 "GTV".
(3)Set Video SW to 01 and measure the gain between Pin46 and
Pin41, that is "GEXT".
V3
AV SW Cross-Talk
/ CTSWTE
/ CTSWET
Video
SW:00/01
Others:Preset
(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 "CTSWTE".
(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 "CTSWET".
V4
Y Input Dynamic
Range
/ DRY
WPS:1
Uni-Color:63
Brightness:0
Color:0
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
(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
"DRY".
V5
Y Input Pedestal
Clamp Voltage
/ VYCLP
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
(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 "VYCLP".
V6
Y Frequency
Response
/ FRY
RGB Mute:0
R cut off:63
DC rest.:10
Uni-Color:127
Sharpness:Adjust
Color:0
Others:Preset
(1)Input a 0.5Vp-p sweep signal with sync into Pin38&39.
(2)Adjust Sharpness so that the output amplitude for FSHP
equals VSH100k.
(3)Measure the frequency at which the output amplitude is 3dB
down
against VSH100k, which is "FRY".
V7
Y Delay Time
/ tYDEL
/
tYDEL-40
/
tYDEL+240
/
tYDEL
Uni-Color:127
Color:0
Y DL:000/001/111
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
(1)Input 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 "tYDEL".
(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 tYDEL-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 tYDEL+240.
(5)Calculate, “
tYDEL-40”= tYDEL-40 - "tYDEL"
“
tYDEL+240”= tYDEL+240 - "tYDEL"
“
tYDEL”= (“tYDEL+240”- “tYDEL-40”)/7
V8
Brightness
Characteristics
/ VBRTMAX
/ VBRTCEN
/ VBRTMIN
Brightness Data
Sensitivity
/
VBRT
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 "VBRTMAX" / "VBRTCEN" / "VBRTMIN".
(3)Calculate;"
VBRT"=(VBRTMAX-VBRTMIN)/127
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