Telephone Signalling Transceiver / Least Cost Router
CMX860
Transmit V.23 FSK Mode
Baud rate
Mark (logical 1) frequency, 1200 baud
Space (logical 0) frequency, 1200 baud
Mark (logical 1) frequency, 75 baud
Space (logical 0) frequency, 75 baud
Notes
Min.
-
1298
2097
389
449
Typ.
1200/75
1300
2100
390
Max.
-
1302
2103
391
451
Units
Baud
Hz
Hz
Hz
5
450
Hz
Transmit Bell 202 FSK Mode
Baud rate
Mark (logical 1) frequency, 1200 baud
Space (logical 0) frequency, 1200 baud
Mark (logical 1) frequency, 150 baud
Space (logical 0) frequency, 150 baud
Notes
Min.
-
1198
2197
386
486
Typ.
1200/150
1200
2200
387
Max.
-
1202
2203
388
488
Units
Baud
Hz
Hz
Hz
5
487
Hz
DTMF/Single Tone Transmit
Tone frequency accuracy
Distortion
Notes
Min.
-0.2
-
Typ.
-
1.0
Max.
+0.2
2.0
Units
%
%
6
Transmit Output Level
Modem and Single Tone modes
DTMF mode, Low Group tones
DTMF: level of High Group tones wrt Low Group
Tx output driver gain control accuracy
Notes
Min.
-4.0
-2.0
+1.0
-0.25
Typ.
-3.0
-1.0
+2.0
-
Max.
-2.0
0.0
+3.0
+0.25
Units
dBm
dBm
dB
6
6
6
6
dB
Notes:
5. Tx signal % baud or bit rate accuracy is the same as XTAL/CLOCK % frequency
accuracy.
6. Measured between LINETXP and LINETXN or PHONETXP and PHONETXN pins with
Tx Level Control gain set to 0dB, 1k2W load between the 'TXP and 'TXN pins,
at AVDD = 3.0V (levels are proportional to AVDD).
Level measurements for all modem modes are performed with random transmitted data
and without any guard tone. 0dBm = 775mVrms.
0
Note 7
-10
Measured on the 2-wire
line with the Tx line signal
level set to -10dBm for
FSK or single tones, -
6dBm and -8dBm for
DTMF tones. Excludes
any distortion due to
Bell 202
-20
-30
-40
-50
-60
-70
dBm
external components
required for line coupling.
10
100
1000
Hz
10000
100000
Figure 12 Maximum Out of Band Tx Line Energy Limits (see note 7)
ã 2002 Consumer Microcircuits Limited
39
D/860/5
CMLMICRO [ CML MICROCIRCUITS ]
