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參數(shù)資料
| 型號： | TA1272AF |
| 元件分類： | 接收器 |
| 英文描述： | AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 0.300 INCH, 1 MM PITCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 2/17頁 |
| 文件大小： | 462K |
| 代理商： | TA1272AF |
TA1272AF
2001-02-28 10/17
TEST CONDITION
<PIF circuit>
Note 1:
Output signal voltage
PIF input : fo = 58.75 MHz, 87.5%AM, 84 dBV, White 100%
Measure output video signal voltage.
Note 2:
PIF input signal voltage sensitivity
PIF input : fo = 58.75 MHz, fm = 15.75 kHz, 30%AM, 84 dBV
Measure output video signal voltage (that voltage is 0 dB) Lower input signal voltage gradually,
measure input PIF signal voltage when output video signal voltage is 3 dB.
Note 3:
Maximum input signal voltage
PIF input : fo = 58.75 MHz, fm = 15.75 kHz, 30%AM, 84 dBV
Measure output video signal voltage (that voltage is 0 dB) Raise input signal voltage gradually,
measure input PIF signal voltage when output video signal voltage is +3 dB
Note 4:
3 dB video band width
(1) PIF input :
fo = 58.75 MHz, 84 dBV, CW
Measure IF AGC voltage and supply that voltage from external source.
(2) Input following composite signals to the PIF input :
SG : 1
58.75 MHz, 84 dBV (frequency : fixed)
SG : 2
58.65~45 MHz, 64 dBV (frequency : variable)
Monitor spectrum of output signal at pin 24. Change frequency of SG : 2, measure frequency of
SG : 2, when video output signal is 3 dB.
Difference between that frequency and 58.75 MHz is 3 dB band width.
Note 5:
Dependence of output signal voltage on power supply voltage
PIF input : fo = 58.75 MHz, 87.5%AM, 84 dBV, standard TV signal (V / S = 10 : 4 Ramp)
Measure the output video signal voltage when power supply voltage are 3.5 V and 5.5 V. (4.5 ± 1.0 V)
Compare those voltage and the output video signal voltage when power supply voltage is 4.5 V.
Note 6:
Deferential gain / Deferential phase
PIF input : fo = 58.75 MHz, 87.5%AM, 84 dBV, standard TV signal (V / S = 10 : 4 Ramp) IF AGC :
free
Measure deferential gain and deferential phase.
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]
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