TB1254N Datasheet, PDF (50/58 Pages) Toshiba Semiconductor – PAL / NTSC / SECAM 1CHIP (IF+VCD PROCESSOR) IC



 
Note
D20
D21
D22
D23
D24
Items/Symbols
V. Ramp DC on
Service Mode
/ VNOVRAMP
Vertical Pull-in Range
(Auto)
/ FVPAUL
/ FVPAUH
Vertical Pull-in Range
(50Hz)
/ FVP50L
/ FVP50H
Vertical Pull-in Range
(60Hz)
/ FVP60L
/ FVP60H
Vertical Period on
Fixed Mode
/ TV3125
/ TV2625
/ TV313
/ TV263
V-BLK Start Phase
/ PH50VBLK
/ PH60VBLK
V-BLK Width
/ W50VBLK
Bus conditoins
V STOP:1
Others:Preset
V-Freq:
000/001/010
Others:Preset
V-Freq:
100/101/110/
111
Others:Preset
All:Preset
/ W60VBLK
Sand Castle
Level
/ VSCPH
/ VSCPM
/ VSCPL
Pulse
All:Preset
D25 Vertical
Ramp All:Preset
Amplitude
/ VVRAMP
D26 Vertical AMP Gain
All:Preset
/ GVAMP
Vertical AMP
Max.Output Level
/ VVOMAX
Vertical AMP
Min.Output Level
/ VVOMIN
D27 Vertical
AMP All:Preset
Max.Output Current
/ IVOMAX
Measurement methods
(1)Set V STOP to 1.
(2)Measure the DC level of Pin24, that is "VNOVRAMP".
(6) Input a composite sync signal into Pin38.
(7) For V-Freq 000/001/010, increasing the input vertical period
from 220H by 0.5H step, measure the period at which input
signal synchronized with V Ramp(Pin24), that is "FVPAUL" /”
FVP50L”/ "FVP60L".
(8) (3)For V-Freq 000/001/010, decreasing the input vertical
period from 360H by 0.5H step, measure the period at which
input signal synchronized with V Ramp, that is "FVPAUH" /”
FVP50H”/ "FVP60H".
For V-Freq 100/101/110/111, measure the vertical period at SCP
out (Pin30), that is "TV312.5"/"TV262.5" / "TV313"/"TV263" .
(1)Input a 50Hz/60Hz composite sync signal into Pin38.
(2)Measure "T50AFCOFF" / "1T60AFCOFF" at Pin30. (cf. Fig.D25)
Measure "VSCPH" / "VSCPM" / "VSCPL" at Pin30.
V_SCPH
V_SCPM
V_SCPL
Measure the V Ramp amplitude at Pin24, that is "VVRAMP".
(1)Let Pin26 be open.
(2)Changing the Pin25 DC voltage, measure "VVOMAX" / "VVOMIN" /
"GVAMP"
according to a following figure.
#26DC
V_VOMAX
ĢV=GVAMP
=20log(ĢV#26/ĢV#25)
V_VOMIN
#25DC
(1)Supply 7V to Pin25.
(2)Measure the current from Pin26 to GND, that is "IVOMAX".
Ver3.7
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