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參數資料

Notes on Using the Application Circuits

1. NC Block

The input impedance of the noise canceller input is about 50 kΩ. 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 kΩ, 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

相關PDF資料	PDF描述
LA1875M	AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO36
LA1875M	AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO36
LA1883M	AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
LA1886M	AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
LA1888NM	AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64

相關代理商/技術參數	參數描述
LA1867NM-MPB-E	制造商:ON Semiconductor 功能描述:
LA186B-9SEF9UG-3-PF	制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY
LA186B-9SEF-PF	制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY
LA186B-DBK-2-PF	制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY
LA186B-DBK-PF	制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY

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