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參數(shù)資料
| 型號(hào)： | TA8805F |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | SSOP-24 |
| 文件頁(yè)數(shù)： | 3/17頁(yè) |
| 文件大?。?/td> | 296K |
| 代理商： | TA8805F |
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TA8805F,TA1207F
2002-12-20 11/17
<SIF circuit>
Note 12:
Output signal voltage
SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBV
Measure output audio signal voltage.
Note 13:
SIF input signal voltage sensitivity
SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBV
Measure output audio signal voltage (that voltage is 0 dB). Lower input SIF signal voltage gradually,
measure input SIF signal voltage when output audio signal voltage is 3 dB.
Note 14:
Total harmonic distortion
SIF input : fo = 4.5 MHz, fm = 400 Hz, 7.5 kHz / devi, 84 dBV
Note 15:
AM Rejection
SIF input :
(1) FM
: fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBV
(2) AM
: fo = 4.5 MHz, fm = 400 Hz, 30%AM, 84 dBV
Measure difference of output audio signal voltage between (1) and (2).
Note 16:
Signal-noise ratio
SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBV
Measure audio signal output voltage. : V1 [mVrms]
SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBV
Measure audio signal output voltage. : V2 [mVrms]
Signal-noise ratio is calculated by following equality.
Signal-noise ratio = 20 og (V1 / V2) [dB]
Note 17:
3 dB bandwidth
SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBV
Measure audio signal output voltage (that voltage is 0 dB). Then change input signal frequency,
measure bandwidth that audio signal output voltage within 3 dB.
Note 18:
Dependence of output signal voltage on power supply voltage
SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBV
Measure the audio signal output voltage when power supply voltage are 3.5 V and 5.5 V. (4.5 ± 1.0 V)
Compare those voltage and audio signal output voltage when power supply voltage is 4.5 V.
Note 19:
Audio amp. voltage gain
Audio input : f = 1 kHz, VIN = 100 mVrms, Pin 11 : VCC
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