CMX869 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX869' PDF : 46 Pages View PDF
Low Power V.32 bis Modem
CMX869
XTAL/CLOCK Input
(timings for an external clock input)
'High' Pulse Width
'Low' Pulse Width
Notes
Min.
60
60
Typ.
-
-
Max.
-
-
Units
ns
ns
Transmit Output Level
Modem and Single Tone modes
DTMF mode, Low Group tones
DTMF: level of High Group tones wrt Low Group
Tx output buffer gain control accuracy
Notes
5
5
5
5
Min.
-1.5
0.5
+1.0
-0.25
Typ.
-0.5
1.5
+2.0
-
Max.
0.5
2.5
+3.0
+0.25
Units
dBm
dBm
dB
dB
Notes:
5. Measured between TXA and TXAN pins with Tx Level Control gain set to 0dB, 1.2kΩ
load between TXA and TXAN, at AVDD = 3.3V (levels are proportional to AVDD - see
section 4.3). Level measurements for all modem modes are performed with random
transmitted data and without any guard tone. 0dBm = 775mVrms.
0
-10
-20
-30
dBm
-40
Bell 202
-50
Notes:
-60
-70
10
100
1000
10000
100000
Hz
Figure 12 Maximum Out of Band Tx Line Energy Limits (see note 6)
6. Measured on the 2 or 4-wire line using the line interface circuits described in section 4.3
with the Tx line signal level set to -10dBm for any modem mode or single tones, -6dBm
and -8dBm for DTMF tones. Excludes any distortion due to external components such as
the line coupling transformer.
© 2003 CML Microsystems Plc
41
D/869/1
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