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參數(shù)資料
| 型號： | TA1290FN |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO16 |
| 封裝： | 0.225 INCH, 0.65 MM PITCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 341K |
| 代理商： | TA1290FN |
TA1290FN
2001-02-26 8/13
Note 8:
Suppression of career
PIF input : fp = 58.75MHz, fm = 15.75kHz, 30%AM, 84dBV
Add the 2nd AGC terminal from external power supply, so that the output video signal voltage
(15-b) can be 2Vp-p.
Turning modulation off, measure output career (Vcareer [Vp-p]) at pin 15. Calculate the following
equation.
(Suppression of career) = 20og (2 / Vcareer) [dB]
Note 9:
Suppression of career harmonics
PIF input : fp = 58.75MHz, fm = 15.75kHz, 30%AM, 84dBV
Add the 2nd AGC terminal from external power supply, so that the output video signal voltage
(15-b) can be 2Vp-p.
Turning modulation off, measure output career (117.5MHz) level (Vcareer [Vp-p]) at pin 15.
Calculate the following equation.
(Suppression of career harmonics) = 20 og
l
(2 / Vcareer) [dB]
Note 10:
AFT control steepness
PIF input : fp = 58.75MHz, 84dBV, CW
Input the above signal and adjust the AFT coil so that the AFT output voltage is 4.5V.
Measure AFT output voltage of following conditions.
(input frequency = 58.74MHz) : VAFT1
(input frequency = 58.76MHz) : VAFT2
AFT control steepness is calculated by following equality.
(AFT control steepness) = f / V = 20 / (VAFT1VAFT2)
Note 11:
Intermodulation
Input following composite signals to the PIF input.
SG : 1
58.75MHz, 84dBV (picture career)
SG : 2
54.25MHz, 74dBV (sound career)
SG : 3
55.17MHz, 74dBV (chroma)
Supply DC voltage to 2nd AGC terminal from external source, so that bottom of output signal
voltage (15-b) matches sync. tip level. Measure the difference of output signal voltage at pin 15
between 3.58MHz component (chroma) and 920kHz component.
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