FX929AD2 datasheet(6/44 Pages) CMLMICRO

6 / 44 page

4-Level FSK Modem Data Pump

FX929A

D/929A/4

1.4

External Components

Figure 2 Recommended External Components

See Section 1.5.1

0.1 µF

± 20%

± 5%, see Note 3

100k ohm

± 5%

0.1 µF

± 20%

± 20%, see Note 2

1M ohm

± 20%

± 20%, see Note 1

± 20%, see Note 2

100k ohm

± 5%

± 20%, see Note 1

± 5%, see Note 3

See Section 1.5.5.3

Note 1: The values used for C3 and C4 should be suitable for the frequency of the crystal X1. As a

guide, values (including stray capacitances) of 33pF at 1MHz falling to 18pF at 10MHz will generally

prove suitable. The 'Phase-Locked Loop Modes' part of section 1.5.5.3 discusses crystal frequency

tolerances.

Note 2: C6 and C7 values (in nano Farads) should be equal to 50000

÷ symbol rate, e.g.

Symbol Rate

C6/C7 (nF)

2400 symbols/second

22.0

4800 symbols/second

10.0

9600 symbols/second

4.7

Note 3: C5 and C8 values (in pico Farads) should be equal to 750000

÷ symbol rate, e.g.

Symbol Rate

C5/C8 (pF)

2400 symbols/second

330

4800 symbols/second

150

9600 symbols/second

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