FX614 Datasheet, PDF (14/17 Pages) CML Microcircuits – Optional Line Equalisation

Bell 202 Compatible Modem
FX614
Operating Characteristics
For the following conditions unless otherwise specified:
V_DD = 3.0V at Tamb = 25°C and V_DD = 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 600Ω.
DC Parameters
I_DD (M0 = '1', M1 = '1')
I_DD (M0 or M1 = '0') at V_DD = 3.0V
I_DD (M0 or M1 = '0') at V_DD= 5.0V
Logic '1' Input Level
Logic '0' Input Level
Logic Input Leakage Current (Vin = 0 to V_DD),
Excluding XTAL/CLOCK Input
Output Logic '1' Level (l_OH = 360µA)
Output Logic '0' Level (l_OL = 360µA)
RDYN O/P 'off' State Current (Vout = V_DD)
FSK Demodulator
Bit Rate
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)
Notes Min.
1, 2
-
1
-
1
-
70%
-
-1.0
V_DD-0.4
-
-
0
1188
2178
3
-40.0
±6.0
4
20.0
3
-
-
8.0
Typ.
1.0
1.0
1.7
-
-
-
-
-
-
1200
1200
2200
-
-
-
-
-
-
Max.
-
1.25
2.5
-
30%
+1.0
-
0.4
1.0
1212
1212
2222
-8.0
-
-
-40.0
25.0
-
FSK Retiming
Acceptable Rx Data Rate
Tx Data Rate
1188
1194
1200
-
1212
1206
FSK Modulator
TXOP Level
Twist (Mark Level wrt Space Level)
5
-1.0
-2.0
0
+1.0
0
+2.0
Tx 1200bits/sec (M1 = '0', M0 = '1').
Bit Rate
Mark (Logical '1') Frequency
Space (Logical '0') Frequency
0
1197
2196
1200
-
-
1212
1203
2204
Tx 150bits/sec (M1 = '0', M0 = '0')
Bit Rate
Mark (Logical '1') Frequency
Mark (Logical '0') Frequency
0
150
152
385
-
389
485
-
489
Units
µA
mA
mA
V_DD
V_DD
µA
V
V
µA
Baud
Hz
Hz
dBV
dB
dB
dBV
ms
ms
Baud
Baud
dB
dB
Baud
Hz
Hz
Baud
Hz
Hz
© 1997 Consumer Microcircuits Limited
14
D/614/4