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參數(shù)資料
| 型號： | LA76818A |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP54 |
| 封裝： | 0.600 INCH, DIP-54 |
| 文件頁數(shù)： | 4/44頁 |
| 文件大小： | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-12/44
Audio Block Input Signals and Test Conditions
Unless otherwise specified, the following conditions apply when each measurement is made.
1. Bus control condition:
AUDIO.MUTE = "0", A.MONI.SW = "0", AUDIO.SW = "1", VOL.FIL = "0", SIF.SYS = "01", IF.AGC.SW = "1"
2. Input 5.5MHz, 90dB
and CW at pin 54.
3. Enter an input signal from pin 51.
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
Maximum gain
AGMAX
1
1kHz, CW
500mVrms
Measure the 1kHz component at the pin 1.
V1 [mVrms]
AGMAX = 20*Log (V1/500) [dB]
VOLUME
= "1111111"
Variable range
ARANGE
1
1kHz, CW
500mVrms
Measure the 1kHz component the pin 1.
V2 [mVrms]
ARANGE = 20*Log (V1/V2) [dB]
VOLUME
= "0000000"
Frequency
characteristics
AF
1
20kHz, CW
500mVrms
Measure the 20kHz component at the pin 1.
V3 [mVrms]
AF = 20*Log (V3/V1) [dB]
VOLUME
= "1111111"
Mute
AMUTE
1
20kHz, CW
500mVrms
Measure the 20kHz component at the pin 1.
V4 [mVrms]
AMUTE = 20*Log (V3/V4) [dB]
VOLUME
= "1111111"
AUDIO.MUTE = ”1”
Distortion
ATHD
1
1kHz, CW
500mVrms
Measure the distortion of the 1kHz component at
the pin 1.
VOLUME
= "1111111"
S/N
ASN
1
No signal
Measure the noise level (DIN AUDIO) at the pin 1.
V5 [mVrms]
ASN = 20*Log (V1/V5) [dB]
VOLUME
= "1111111"
Crosstalk
ACT
1
1kHz, CW
500mVrms
Measure the 1kHz component at the pin 1.
V6 [mVrms]
ACT = 20*Log (V1/V6) [dB]
VOLUME
= "1111111"
AUDIO.SW = "0"
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