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FX919AP4 Datasheet(PDF) 6 Page - CML Microcircuits

Part # FX919AP4
Description  4-Level FSK Modem Data Pump
Download  44 Pages
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Manufacturer  CMLMICRO [CML Microcircuits]
Direct Link  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

FX919AP4 Datasheet(HTML) 6 Page - CML Microcircuits

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4-Level FSK Modem Data Pump
FX919A
© 1996 Consumer Microcircuits Limited
6
D/919A/4
1.4
External Components
Figure 2 Recommended External Components
R1
See Section 1.5.1
C1
0.1 µF
± 20%
C5
± 5%, see Note 3
R2
100k ohm
± 5%
C2
0.1 µF
± 20%
C6
± 20%, see Note 2
R3
1M ohm
± 20%
C3
± 20%, see Note 1
C7
± 20%, see Note 2
R4
100k ohm
± 5%
C4
± 20%, see Note 1
C8
± 5%, see Note 3
X1
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
82


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