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参数资料
| 型号： | LA3450 |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO DEMODULATOR, PDIP28 |
| 封装： | DIP-28 |
| 文件页数： | 3/16页 |
| 文件大小： | 522K |
| 代理商： | LA3450 |
LA3450
Νο.2393-11/16
9. Feedback resistance of post amplifier and total gain, de-emphasis constants
Table 2 shows the feedback resistance of post amplifier and the total gain, de-emphasis constants.
R4 (R5)
Total gain
C12 (C11) 50
μs
C12 (C11) 50
μs
33k
Ω
0dB
1500pF
2200pF
39k
Ω
1.5dB
1200pF
2000pF
51k
Ω
4dB
1000pF
1500pF
62k
Ω
5.5dB
750pF
1200pF
82k
Ω
8dB
620pF
910pF
100k
Ω
10dB
510pF
750pF
130k
Ω
12dB
390pF
560pF
150k
Ω
13dB
330pF
510pF
180k
Ω
15dB
270pF
390pF
Total gain : At monaural mode, R4 C12 = R5 C11 = 50
μs, 75μs
Table 2. Feedback resistance of post amplifier and of total gain, de-emphasis constants
10. Low-pass filter
Figs. 5, 6 show a sample circuit configuration and characteristic of the low-pass filter.
Fig. 5 Sample Circuit of LC Filter
-70
10
f Response
Frequency, f -- Hz
Response
-
-dB
JK345015
1k
2
3
5
7
10k
2
3
5
7 100k
0
-10
-20
-30
-40
-50
-60
2
6800pF
1000pF
3.3k
Ω
3.3k
Ω
40mH
Fig. 6 f Response
Note : As the use of this low-pass filter makes the attenuation less at 19kHz, 38kHz, carrier leak at the LPF output
causes the stereo distortion and separation characteristics to get worse than specified in the Electric
Characteristics. For example, the stereo distortion becomes approximately 0.5% due to carrier leak.
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