CMX865 CML Microcircuits, CMX865 Datasheet - Page 36

• Manufacturer Part Number: CMX865
• Description: FSK Modem and DTMF Codec
• Manufacturer: CML Microcircuits

FSK Modem and DTMF Codec
Notes:
© 2005 CML Microsystems Plc
Transmit Output Level
Modem and Single Tone modes
DTMF mode, Low Group tones
DTMF twist (level of high group tones wrt
Tx output buffer gain control accuracy
low group) setting accuracy
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.
Figure 12 Maximum Out of Band Tx Line Energy Limits (see note 7)
dBm
-10
-20
-30
-40
-50
-60
-70
0
10
Bell 202
100
36
1000
Notes
Hz
6
6
6
6
-0.25
Min.
-3.2
-1.2
-1.0
10000
Typ.
-2.2
-0.2
-
-
100000
+0.25
Max.
+ 0.8
+1.0
-1.2
CMX865
Units
D/865/3
dBm
dBm
dB
dB