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參數(shù)資料
| 型號： | TA1209F |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PQFP48 |
| 封裝： | 10 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-48 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 358K |
| 代理商： | TA1209F |
TA1209F
2002-12-20 19/24
<SIF circuit>
Note 17: AF output signal voltage
2nd SIF input : fs = 10.7 MHz, fm = 1 kHz, 25 kHz / devi, 100 dBV
Measure AF output signal voltage at pin 42.
Note 18: SIF input signal voltage sensitivity
2nd SIF input : fs = 10.7 MHz, fm = 1 kHz, 25 kHz / devi, 100 dBV
Measure AF output signal voltage at pin 42. (This voltage is 0 dB) Lower input signal voltage gradually,
measure the input signal voltage when output signal voltage at pin 42 is 3 dB.
Note 19: 3 dB AF bandwidth
2nd SIF input : fs = 10.4 MHz~11.0 MHz, fm = 1 kHz, 25 kHz / devi, 100 dBV
(1) Measure AF output signal voltage at pin 42. (This voltage is 0 dB) Lower input signal frequency
gradually, measure the input signal frequency when output signal voltage at pin 42 is 3 dB. (BWA lo)
(2) Raise input signal frequency gradually, measure the input signal frequency when output signal voltage
at pin 42 is 3 dB. (BWA hi)
The difference between (BWA lo) and (BWA hi) is 3 dB AF bandwidth.
Note 20: Signal-noise ratio
(1) 2nd SIF input : fs = 10.7 MHz, fm = 1 kHz, 25 kHz / devi, 100 dBV
Measure AF output signal voltage at pin 42. (VA out)
(2) 2nd SIF input : fs = 10.7 MHz, CW, 100 dBV
Measure AF output signal voltage at pin 42. (VA out no-mod)
Signal-noise ratio is calculated by following equality.
Signal-noise ratio = 20 og
l
[(VA out) / (VA out no-mod)]
Note 21: AM suppression
(1) 2nd SIF input : fs = 10.7 MHz, fm = 1 kHz, 25 kHz / devi, 100 dBV
Measure AF output signal voltage at pin 42. (VA out)
(2) 2nd SIF input : fs = 10.7 MHz, fm = 1 kHz, 30%AM, 100 dBV
Measure AF output signal voltage at pin 42. (VA out AM)
AM suppression calculated by following equality.
AM suppression = 20 og
l
[(VA out) / (VA out AM)]
Note 22: Total harmonic distortion
2nd SIF input : fs = 10.7 MHz, fm = 1 kHz, 25 kHz / devi, 100 dBV
Measure total harmonic distortion of output signal at pin 42.
Note 23: Signal meter output voltage
2nd SIF input : fs = 10.7 MHz, CW
Measure output voltage at pin 3, when input signal voltage are 100 dBV, 80 dBV, 50 dBV and 20 dBV.
Note 24: Station detector bandwidth
2nd SIF input : fs = 10.5 MHz~10.9 MHz, CW, 100 dBV
Change input signal frequency, measure the bandwidth when output voltage at pin 1 is hi.
Note 25: Station detector sensitivity
2nd SIF input : fs = 10.7 MHz, CW, 100 dBV
Lower input signal voltage gradually, measure the input signal voltage when output signal voltage at pin 1
turn Lo. from Hi.
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