CMX969 Consumer Microcircuits Limited, CMX969 Datasheet - Page 34

• Manufacturer Part Number: CMX969
• Description: RD-LAP/MDC4800/Motient/ARDIS4-Level FSK Packet Data Modem
• Manufacturer: Consumer Microcircuits Limited

RD-LAP/MDC4800 Motient/ARDIS
Note: BER vs. S/N measured under nominal working conditions, after a Frame Sync has been detected using
AFSD, with pseudo-random data.
2001 Consumer Microcircuits Limited
5. For optimum performance, measured at RXFB pin, for a "...+3 +3 -3 -3..." symbol sequence
6. Timing for an external input to the XTAL pin.
7. WRN, RDN, CSN, A0 and A1 pins.
8. D0 - D7 pins.
9. IRQN pin.
in RD-LAP mode, “+1 -1 “ in MDC mode, at V
level and DC offset values are proportional to V
range of (V
Figure 13a Typical Bit Error Rate With and Without FEC: RD-LAP Mode
Figure 13b Typical Bit Error Rate With and Without FEC: MDC Mode
BER
BER
1E-1
1E-2
1E-3
1E-4
1E-5
1E-6
1E-1
1E-2
1E-3
1E-4
1E-5
1E-6
SS
+ 0.25V) to (V
8
0
1
S/N dB (Noise in 2 x Symbol Rate Bandwidth)
9
2
S/N dB (Noise in Bit Rate Bandwidth)
DD
10
3
– 0.25V).
4
34
11
5
12
6
DD
DD
7
= 5.0V and Tamb = 25°C. The optimum input
13
. Signal peaks should not go outside the
8
BER with FEC
BER without
FEC
BER with FEC
BER without
FEC
14
9
10 11 12
15
16
CMX969
D/969/5