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參數(shù)資料
| 型號： | LA1867NM |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Car Radio Single-Chip Tuner System |
| 中文描述： | 汽車無線電單芯片調諧器系統(tǒng) |
| 文件頁數(shù)： | 21/32頁 |
| 文件大?。?/td> | 941K |
| 代理商： | LA1867NM |
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Notes on Using the Application Circuits
1. NC Block
The input impedance of the noise canceller input is about 50 k
. Carefully consider the low area frequency
characteristics when determining the value of the coupling capacitor. Note that when the value is 1 μF in the
application circuit, fc will be about 3 Hz.
Pins 38 and 39 are used to set the noise detection sensitivity and the noise AGC.
The values of the external components can be determined more easily by first setting the medium field (antenna
input levels of about 50 dBμ) with the noise sensitivity setting pin (pin 38), and then setting the weak field (antenna
input levels of about 20 to 30 dBμ) with the AGC adjustment pin (pin 39). Care is required in determining these
settings since while the AGC operation improves as the noise detection sensitivity is increased, inversely, the weak
field sensitivity decreases.
If noise is detected again during gating, since the monostable multivibrator will be reset, the gate time will change
with the magnitude of the noise. Finally, set the gate time from the point noise is detected. When the circuit
constants in the circuit connected to pin 40 are C = 0.001 μF and R = 12 k
, the gate time will be about 10 μs.
2. MRC Block
The MRC (multipath rejection circuit) supports three techniques as shown in Figures 2, 3 and 4. Figure 2 shows the
technique in which the S-meter AC component is detected directly. Figure 3 shows the technique in which the NC
HPF noise is detected, and Figure 4 shows the technique in which multipath is detected using the S-meter high area
components.
Figure 2 Multipath Circuit
Figure 3 Application Circuit Using NC HPF Noise Detection
No. 4619-21/32
LA1867NM
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