FX828 datasheet(6/34 Pages) CMLMICRO

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CTCSS/DCS/SELCALL Processor

FX828

D/828/4

1.4

External Components

22pF

±20%

±5%

4.032MHz

22pF

±20%

100k

±10%

(tolerance depends upon

100pF

±20%

100k

±10%

system requirements)

0.1µF

±20%

Note 2

±10%

100pF

±20%

22k

±10%

0.1µF

±20%

Note 1

±10%

Note 2

±20%

Note 1

±10%

0.1µF

±20%

1.0 to 3.3µF

±20%

Notes:

R2, R6, R7 and C3 form the gain components for the Summing Amplifier. R6 and R7

should be chosen as required from the system specification, using the following formula:

Tx Sub Audio Gain

= −

Tx Audio Gain

= −

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:

Gain

= −

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

product.

Figure 2 Recommended External Components

FX828 Datasheet(PDF) 6 Page - CML Microcircuits

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