V.23 Transmit Modulator
CMX654
Operating Characteristics
For the following conditions unless otherwise specified:
V
DD
= 3.0V at Tamb = 25°C and V = 3.3V to 5.5V at Tamb = -40 to +85°C,
DD
Xtal Frequency = 3.579545MHz ± 0.1%
0dBV corresponds to 1.0Vrms
0dBm corresponds to 775mVrms into 600W.
Notes
Min.
Typ.
Max.
Units
DC Parameters
I
I
I
(M0='1', M1='1')
(M0 or M1='0') at V = 3.0V
(M0 or M1='0') at V = 5.0V
1, 2
1
1
-
-
-
1
1.0
1.7
-
mA
mA
mA
DD
DD
DD
1.25
2.5
DD
DD
Logic '1' Input Level
Logic '0' Input Level
Logic Input Leakage Current (Vin = 0 to V ),
70%
-
-1.0
-
-
-
-
V
V
mA
DD
30%
+1.0
DD
DD
Excluding XTAL/CLOCK Input
V
DD
-0.4
-
-
-
-
-
-
V
V
mA
Output Logic '1' Level (l = 360mA)
OH
0.4
1.0
Output Logic '0' Level (l = 360mA)
OL
RDYN O/P 'off' State Current (Vout = V
)
DD
FSK Retiming
Tx Data Rate
1194
-
1206
Baud
FSK Modulator
TXOP Level
Twist (Mark Level WRT Space Level)
3
-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
1297
2097
1200
-
-
1212
1303
2103
Baud
Hz
Hz
XTAL/CLOCK Input
'High' Pulse Width
'Low' Pulse Width
4
4
100
100
-
-
-
-
ns
ns
Notes: 1. At 25°C, not including any current drawn from the CMX654 pins by external circuitry other than
X1, C1 and C2.
2. TXD and CLK inputs at V , M0 and M1 inputs at V
.
DD
SS
3. Relative to 775mVrms at V = 5.0V for load resistances greater than 40kW.
DD
4. Timing for an external input to the XTAL/CLOCK pin.
Data and Mode Timing
Min.
Typ.
Max.
Units
ã 1998 Consumer Microcircuits Limited
10
D/654/3
CMLMICRO [ CML MICROCIRCUITS ]
