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参数资料
| 型号： | TA8805F |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封装： | SSOP-24 |
| 文件页数： | 17/17页 |
| 文件大小： | 296K |
| 代理商： | TA8805F |
TA8805F,TA1207F
2002-12-20 9/17
TEST CONDITION
<PIF circuit>
Note 1:
Output signal voltage
PIF input : fo = 58.75 MHz, 87.5%AM, 84 dBV, standard TV signal (V / S = 10 : 4 Ramp)
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.
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