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參數(shù)資料
| 型號： | TA1207F |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | SSOP-24 |
| 文件頁數(shù)： | 2/17頁 |
| 文件大?。?/td> | 296K |
| 代理商： | TA1207F |
TA8805F,TA1207F
2002-12-20 10/17
Note 7:
Signal-noise ratio
(1) PIF input : fo = 58.75 MHz, fm = 15.75 kHz, 30%AM, 84 dBV
Measure IF AGC voltage and supply that voltage from external source.
(2) Measure output video signal voltage. : V1
(3) PIF input : fo = 58.75 MHz, 84 dBV, CW
Measure output video signal voltage. : V2
Signal-noise ratio is calculated by following equality.
Signal-noise ratio = 20 og
l
(V1 × 6 / V2) [dB]
Note 8:
Intermodulation
(1) PIF input :
fo = 58.75 MHz, 84 dBV, CW
Supply DC voltage to IF AGC from external source to fix IF AGC voltage.
(2) PIF input :
following composite signals
fo = 58.75 MHz, 84 dBV, CW
fc = 55.17 MHz, 74 dBV, CW
Input
fs = 54.25 MHz, 74 dBV, CW
Measure the difference of signal level at pin 24 920 kHz component and 3.58 MHz component
(Chroma sub-carrier).
Note 9:
Suppression of picture career
(1) PIF input :
fo = 58.75 MHz, fm = 15.75 kHz, 78%AM, 84 dBV
Measure IF AGC voltage and supply that voltage from external source.
(2) Measure output video signal voltage. : V1
(3) PIF input :
fo = 58.75 MHz, 84 dBV, CW
Measure signal level of 58.75 MHz component at pin 24. : V2
Signal-noise ratio is calculated by following equality.
Suppression of picture career = 20 × og
l
(V1 / V2) [dB]
Note 10:
Output voltage at no signal
PIF input : no input IF AGC : GND
Measure output video signal DC voltage.
Note 11:
Black noise inverter level / Black noise clamp level
PIF input : fo = 58.75 MHz, fm = 15.75 kHz, 78%AM, 84 dBV
Supply 0 V to IF AGC from external source. Raise that voltage gradually, measure black noise
inverter level.
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