CMX865D2 CML Microcircuits, CMX865D2 Datasheet - Page 38

• Manufacturer Part Number: CMX865D2
• Description: FSK Modem and DTMF Codec
• Manufacturer: CML Microcircuits

FSK Modem and DTMF Codec
Notes:
© 2005 CML Microsystems Plc
Rx Modem Energy Detector
Rx Answer Tone Detectors
Rx Call Progress Energy Detector
Detect (‘Off’ to ‘On’) response time
Detect threshold (‘Off’ to ‘On)
Undetect threshold (‘On’ to ‘Off’)
Hysteresis
Undetect (‘On’ to ‘Off’) response time
Detect threshold (‘Off’ to ‘On)
Undetect threshold (‘On’ to ‘Off’)
Hysteresis
Detect (‘Off’ to ‘On’) response time
Undetect (‘On’ to ‘Off’) response time
2100Hz detector
2225Hz detector
Bandwidth (-3dB points) See Figure 6a
Detect threshold (‘Off’ to ‘On)
Undetect threshold (‘On’ to ‘Off’)
Detect (‘Off’ to ‘On’) response time
Undetect (‘On’ to ‘Off’) response time
300 and 1200baud
150 and 75baud
300 and 1200baud
150 and 75baud
‘Will detect’ frequency
‘Will not detect’ frequency
‘Will detect’ frequency
‘Will not detect’ frequency
9. Thresholds and times measured with continuous binary ‘1’. Fixed compromise line
10. ‘Typical’ value refers to 2100Hz or 2225Hz signal switched between off and -33dBm.
11. ‘Typical’ value refers to 400Hz signal switched between off and -33dBm.
equaliser enabled. Signal switched between off and -33dBm.
Times measured wrt. received line signal.
38
Notes
Notes
Notes
8, 10
8, 10
8, 10
8, 10
8, 10
8, 11
8, 11
8, 11
8, 11
8, 9
8, 9
8, 9
8, 9
8, 9
8, 9
8, 9
-48.0
-48.0
-42.0
2050
2160
2335
Min.
Min.
30.0
Min.
30.0
16.0
10.0
20.0
275
2.0
8.0
2.0
7.0
6.0
-
-
-
-
Typ.
Typ.
Typ.
33.0
18.0
36.0
8.0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Max.
-43.0
Max.
-43.0
2160
2000
2285
Max.
-37.0
30.0
60.0
40.0
80.0
45.0
25.0
45.0
50.0
665
-
-
-
-
-
-
CMX865
Units
Units
Units
D/865/3
dBm
dBm
dBm
dBm
dBm
dBm
ms
ms
ms
ms
ms
ms
ms
ms
dB
dB
Hz
Hz
Hz
Hz
Hz