Bell 202 Compatible Modem
FX614
Operating Characteristics
For the following conditions unless otherwise specified:
VDD = 3.0V at Tamb = 25°C and VDD = 3.3V to 5.5V at Tamb = -40 to +85°C,
Xtal Frequency = 3.579545MHz ± 0.1%
0dBV corresponds to 1.0Vrms
0dBm corresponds to 775mVrms into 600W.
Notes
Min.
Typ.
Max.
Units
DC Parameters
IDD (M0 = '1', M1 = '1')
IDD (M0 or M1 = '0') at VDD = 3.0V
IDD (M0 or M1 = '0') at VDD= 5.0V
1, 2
1
1
-
-
-
1.0
1.0
1.7
-
mA
mA
mA
1.25
2.5
Logic '1' Input Level
Logic '0' Input Level
Logic Input Leakage Current (Vin = 0 to VDD),
Excluding XTAL/CLOCK Input
Output Logic '1' Level (lOH = 360mA)
Output Logic '0' Level (lOL = 360mA)
70%
-
-1.0
-
-
-
-
VDD
VDD
mA
30%
+1.0
VDD-0.4
-
-
-
-
V
V
mA
-
-
0.4
1.0
RDYN O/P 'off' State Current (Vout = VDD
)
FSK Demodulator
Bit Rate
0
1200
1200
2200
-
-
-
-
-
-
1212
1212
2222
-8.0
-
Baud
Hz
Hz
dBV
dB
dB
dBV
ms
ms
Mark (Logical '1') Frequency
Space (Logical '0') Frequency
Valid Input Level Range
Maximum Twist (Mark Level wrt Space Level)
Acceptable Signal to Noise Ratio
Level Detector 'On' Threshold Level
Level Detector 'Off' to 'On' Time (Figure 4 Teon)
Level Detector 'On' to 'Off' Time (Figure 4 Teoff)
1188
2178
-40.0
±6.0
20.0
-
3
4
3
-
-40.0
25.0
-
-
8.0
FSK Retiming
Acceptable Rx Data Rate
Tx Data Rate
1188
1194
1200
-
1212
1206
Baud
Baud
FSK Modulator
TXOP Level
Twist (Mark Level wrt Space Level)
5
-1.0
-2.0
0
0
+1.0
+2.0
dB
dB
Tx 1200bits/sec (M1 = '0', M0 = '1').
Bit Rate
Mark (Logical '1') Frequency
Space (Logical '0') Frequency
0
1197
2196
1200
-
-
1212
1203
2204
Baud
Hz
Hz
Tx 150bits/sec (M1 = '0', M0 = '0')
Bit Rate
Mark (Logical '1') Frequency
Mark (Logical '0') Frequency
0
385
485
150
-
-
152
389
489
Baud
Hz
Hz
ã 1997 Consumer Microcircuits Limited
14
D/614/4
CMLMICRO [ CML MICROCIRCUITS ]
