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FX929B Datasheet(PDF) 39 Page - CML Microcircuits

Part # FX929B
Description  Flexible Operating Modes
PDF  48 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  CMLMICRO [CML Microcircuits]
Direct Link  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

FX929B Datasheet(HTML) 39 Page - CML Microcircuits

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4-Level FSK Modem Data Pump
FX929B
© 1997 Consumer Microcircuits Limited
39
D/929B/1
S/N dB (Noise in 20 to 9600Hz band)
1E-4
1E-3
1E-2
1E-1
4
5
6
7
8
9
10
11
12
13
14
Tx & Rx DC coupled
Tx 5Hz, Rx DC
Tx 5Hz, Rx 5Hz
Tx 5Hz, Rx 10Hz
Figure 19 Effect of AC Coupling on BER without FEC
Secondly, any ac coupling at the receive input will transform any step in the voltage at the discriminator output
to a slowly decaying pulse which can confuse the modem's level measuring circuits. As illustrated in Figure 20
below, the time for this step to decay to 37% of its original value is 'RC' where:
RC = 1/( 2 x
π x the 3dB cut-off frequency of the RC network )
which is 32 msec, or 153 symbol times at 4800 symbols/sec, for a 5Hz network.
37%
T=RC
100%
Step input
to RC circuit
Output of
RC circuit
Figure 20 Decay Time - AC Coupling
In general, it will be best to dc couple the receiver discriminator to the modem, and to ensure that any ac
coupling to the transmitter's frequency modulator has a -3dB cut-off frequency of no higher than 5Hz (for 4800
symbols/sec).



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