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(yè)數(shù)： 32/58頁(yè)
文件大?。?/td> 551K
代理商： TB1254N
Ver3.7
00/01/28
32
Note
P7
Items/Symbols
Video output signal
amplitude
/ vDet(p)n
/ vDet(p)p
Bus conditions
RF AGC:except 0
PIF Freq. :
38.9MHz
VCO Adj. Req. :
0/1
L-SECAM MODE
:0/1
Others : Preset
Measurement methods
(1) nput a signal that 38.9[MHz], 90[dB V], and 87.5 [%] negative
modulated by 100% white video signal at pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Set the bit of “L-SECAM MODE” to “0”.
(4) Measure the amplitude of the pin 54 output signal (vDet(p)n[Vp-
p]).
(5) nput a signal that 38.9[MHz], 90[dB V], and 97 [%] positive
modulated by 100% white video signal at pin 6.
(6) Set the bit of “L-SECAM MODE” to “1”.
(7) Measure the amplitude of the pin 54 output signal (vDet(p)p[Vp-
p]).
(1) nput a signal that 38.9[MHz], 90[dB V], and 87.5 [%] modulated
by black video signal at pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Measure the video S/N for pin 54 output (HPF : 100[kHz], LPF :
5[MHz], CCIR weighted) (S/N(p)[dB]).
(1) nput a signal that 38.9[MHz], 90[dB V], 87.5[%] negative
modulated by 100% white signal at pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Set the bit of “L-SECAM MODE” to “0”.
(4) Measure the voltage of the sync. tip at pin 54 (Vsync n[V]).
(5) nput a signal that 38.9[MHz], 90[dB V], and 97 [%] positive
modulated by 100% white video signal at pin 6.
(6) Set the bit of “L-SECAM MODE” to “1”.
(7) Measure the voltage of the sync. tip at pin 54 (Vsync p[V]).
(1) nput the mixture of 2 signals (signal1 : 38.9[MHz]/82[dB V],
signal 2 : 38.8[MHz]/69[dB V]) to pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Measure the minimum voltage of the output signal at pin 54
(Vo#54).
(4) Apply the DC voltage to pin 10 and adjust it so that the minimum
voltage of the output signal at pin 54 is equal to Vo#54.
(5) Decrease frequency of the input signal 2 at pin 6, and measure
amplitude of the output signal at pin 54.
(6) Measure fDet(p) shown as below.
P8
Video output S/N
/ S/N(p)
RF AGC:except 0
PIF Freq. :
38.9MHz
VCO Adj. Req. :
0/1
Others : Preset
RF AGC:except 0
PIF Freq. :
38.9MHz
VCO Adj. Req.:
0/1
L-SECAM MODE
:0/1
Others : Preset
P9
Synchronous signal
level
/ Vsync n
/ Vsync p
P10
Video bandwidth
(-3dB)
/ fDet(p)
RF AGC:except 0
PIF Freq.:
38.9MHz
VCO Adj. Req.:
0/1
L-SECAM MODE
:0/1
Others : Preset
Frequency of
the output signal at pin54
Ref.level
O
3[dB]
100[kHz]
f Det(p)
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