FX818 데이터 시트보기 (PDF) - CML Microsystems Plc

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FX818

CTCSS Signalling Processor

CML Microsystems Plc 

CTCSS Signalling Processor

1.4 External Components

FX818

C1 22pF

C2 22pF

C3 100pF

C4 0.1µF

C5 100pF

C6 0.1µF

C7 Note 2

C8 0.1µF

±20%

±20%

±20%

±20%

±20%

±20%

±20%

±20%

R1 1M

±5%

R2 100k ±10%

R3 100k ±10%

R4 Note 2 ±10%

R5 22k

±10%

R6 Note 1 ±10%

X1 4.032MHz ±100ppm

Notes: 1. R2, R6 and C3 form the gain components for the Summing Amplifier. R6 should be chosen as

required from the system specification, using the following formula:

R2

Tx Sub Audio Gain = −

R6

2. R3, R4, C5 and C7 form the gain components for the Rx Input Amplifier. R4 should be chosen

as required by the signal level, using the following formula:

R3

Gain = −

R4

C7 x R4 should be chosen so as not to compromise the low frequency performance of this

product.

Figure 2 Recommended External Components

© 1997 Consumer Microcircuits Limited

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D/818/4

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