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參數(shù)資料
| 型號： | 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)： | 33/58頁 |
| 文件大小： | 551K |
| 代理商： | TB1254N |
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Ver3.7
00/01/28
33
Note
P11
Items/Symbols
Capture range of the
PLL
/ fpH(p)
/ fpL(p)
Hold range of the PLL
/ fhH(p)
/ fhL(p)
Bus conditions
RF AGC : except
0
PIF Freq. :
38.9MHz
VCO Adj. Req. :
0/1
Others : Preset
Measurement methods
(1) nput a signal that 38.9[MHz], 90[dB V] at pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Sweep down the input signal frequency to 34.9[MHz], and
sweep up to 43.9[MHz]. Sweep down the input signal frequency
to 38.9[MHz].
(4) Measure the voltage at pin 55 and measure the frequency of the
input signal shown as below.
Frequency of
the input signal
V
38.9[MHz]
f p(p)H
f h(p)L
f p(p)L
f h(p)H
P12
Control steepness of
the VCO
/
PIF Freq. :
38.9MHz
VCO Adj. Req. :
0/1
Others : Preset
(1) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO
Adj. Req.” to “0”.
(2) Set the FET probe which connected to the spectrum analyzer
near by pin 50 or pin 51 (Don’t touch the probe directly to pin 50
or to pin 51).
(3) Apply 2.3[V] to pin 47, and measure frequency of the VCO
oscillation by the spectrum analyzer (fLVCO[MHz]).
(4) Apply 2.7[V] to pin 47, and measure frequency of the VCO
oscillation by the spectrum analyzer (fHVCO[MHz]).
(5) [MHz/V] = (fHVCO-fLVCO)/0.4
(1) Input a 38.9[MHz], 90[dB V] 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) Input a 38.9[MHz]-20[kHz], 90[dB V], non-modulation signal at
pin 6.
(4) Measure the voltage at pin 55 (VH#55[V]).
(5) Input a 38.9[MHz]+20[kHz], 90[dB V], non-modulation signal
at pin 6.
(6) Measure the voltage at pin 55 (VL#55[V]).
(7) S AFT[kHz/V] = 40/(VH#55-VL#55)
(8) Input a 38.9[MHz]-500[kHz], 90[dB V], non-modulation signal
at pin 6.
(9) Measure the voltage at pin 55 (VAFTmax[V]).
(10) Input a 38.9[MHz]+500[kHz], 90[dB V], non-modulation signal
at pin 6.
(11) Measure the voltage at pin 55 (VAFTmin[V]).
(1)Measure the voltage at pin 55 (VAFT Def[V]).
P13
Steepness of the AFT
detection
/ S AFT
AFT Voltage
/ VAFTmax
/ VAFTmin
PIF Freq. :
38.9MHz
VCO Adj. Req.:
0/1
Others : Preset
P14
AFT output voltage on
defeating
Preset
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