FSK Modem and DTMF Codec
CMX865
Transmit Output Level
Notes
Min.
-3.2
-1.2
Typ.
-2.2
-0.2
Max.
-1.2
+ 0.8
Units
dBm
dBm
Modem and Single Tone modes
DTMF mode, Low Group tones
DTMF twist (level of high group tones wrt
low group) setting accuracy
6
6
6
6
-1.0
-0.25
-
-
+1.0
+0.25
dB
dB
Tx output buffer gain control accuracy
0
-10
Bell 202
-20
-30
dBm
-40
-50
-60
-70
10
100
1000
Hz
10000
100000
Figure 12 Maximum Out of Band Tx Line Energy Limits (see note 7)
Notes:
7. Measured on the 2 or 4-wire line using the line interface circuits described in section 4.2
with the Tx line signal level set to –9.2dBm for FSK or single tones, -5.2dBm and –
7.2dBm for DTMF tones. Excludes any distortion due to external components such as the
line coupling transformer.
© 2005 CML Microsystems Plc
36
D/865/3
CMLMICRO [ CML MICROCIRCUITS ]
