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)： 35/58頁(yè)
文件大?。?/td> 551K
代理商： TB1254N
Ver3.7
00/01/28
35
Note
S5
Items/Symbols
AF output signal
amplitude
/ vDet(s)5.5M
AF output S/N
/ S/N(s)5.5M
Total harmonics
distortion
/ THD5.5M
AF output signal
amplitude
/ vDet(s)6.0M
AF output S/N
/ S/N(s)6.0M
Total harmonics
distortion
/ THD6.0M
AF output signal
amplitude
/ vDet(s)6.5M
AF output S/N
/ S/N(s)6.5M
Total harmonics
distortion
/ THD6.5M
Demodulation band
width of the FM
demodulator
/ fpH(s)1
/ fpL(s)1
Bus conditions
SIF-Freq. :5.5M
AUDIO ATT : 127
Others : Preset
Measurement methods
(1) nput a signal that 5.5[MHz], 100[dB V], 50[kHz] deviated by
400[Hz] sine wave at pin 56.
(2) Do same measuring as vDet(s)4.5MH et al. (vDet(s)5.5M,
S/N(s)5.5M, THD5.5M).
S6
SIF-Freq. : 6.0M
AUDIO ATT : 127
Others : Preset
(1) nput a signal that 6.0[MHz], 100[dB V], 50[kHz] deviated by
400[Hz] sine wave at pin 56.
(2) Do same measuring as vDet(s)4.5MH et al. (vDet(s)6.0M,
S/N(s)6.0M, THD6.0M).
S7
SIF-Freq. : 6.5M
AUDIO ATT : 127
Others : Preset
(1) nput a signal that 6.5[MHz], 100[dB V], 50[kHz] deviated by
400[Hz] sine wave at pin 56.
(2) Do same measuring as vDet(s)4.5MH et al. (vDet(s)6.5M,
S/N(s)6.5M, THD6.5M).
S8
SIF-Freq. : 4.5M
AUDIO ATT : 127
Others : Preset
(1) nput a signal that 4.5[MHz], 100[dB V], 25[kHz] deviated by
400[Hz] sine wave at pin 56.
(2) Measure the amplitude at pin 4(vo#4 [Vp-p]).
(3) ncrease the input signal frequency, measure the input signal
frequency at which the output amplitude at pin 4 turn to be -
3[dB] against “vo#4” (fpH(s)1[MHz])
(4) Decrease the input signal frequency, measure the input signal
frequency at which the output amplitude at pin 4 turn to be -
3[dB] against “vo#4” (fpL(s)1[MHz])
(1) nput a signal that 5.5[MHz], 100[dB V], 50[kHz] deviated by
400[Hz] sine wave at pin 56.
(2) Measure the amplitude at pin 4(vo#4 [Vp-p]).
(3) ncrease the input signal frequency, measure the input signal
frequency at which the output amplitude at pin 4 turn to be -
3[dB] against “vo#4” (fpH(s)2[MHz])
(4) Decrease the input signal frequency, measure the input signal
frequency at which the output amplitude at pin 4 turn to be -
3[dB] against “vo#4” (fpL(s)2[MHz])
(1) Input a 400[Hz], 927[mVrms] sine wave at pin 53.
(2) Set the “AUDIO ATT” data to “127”.
(3) Measure the amplitude at pin 4 (v#4max[mVrms]).
(4) G att max[dB] = 20log(v#4max/927)
(5) Set the “AUDIO ATT” data to “64”.
(6) Measure the amplitude at pin 4 (v#4mid[mVrms]).
(7) G att mid[dB] = 20log(v#4mid/927)
(8) Set the “AUDIO ATT” data to “0”.
(9) Measure the amplitude at pin 4 (v#4min[mVrms]).
(10) G att min[dB] = 20log(v#4min/927)
(1) Connect pin 53 to GND through a 4.7[ F] capacitor.
(2) Set the “AUDIO ATT” data to “127”.
(3) Measure the DC voltage at pin 4 (V#4max[mV]).
(4) Set the “AUDIO ATT” data to “0”.
(5) Measure the DC voltage at pin 4 (V#4min[mV]).
(6) Vos[mV] = V#4min-V#4max
S9
Demodulation band
width of the FM
demodulator
/ fpH(s)2
/ fpL(s)2
SIF-Freq. : 5.5M
AUDIO ATT : 127
Others : Preset
S10
Audio attenuater gain
/ G att max
/ G att mid
/ G att min
AUDIO-SW : 1
AUDIO ATT :
0/64/127
Others : Preset
S11
Audio attenuater off-
set
/ Vos att
AUDIO-SW : 1
AUDIO ATT :
0/127
Other : Preset
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