CMX867(2000) データシートの表示（PDF） - CML Microsystems Plc
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CMX867 Datasheet PDF : 45 Pages
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Low Power V.22 Modem
CMX867
Rx Modem '0011' Dibit Pattern Detector
(1200bps DPSK mode)
Will detect pattern lasting for
Will not detect pattern lasting for
Hold time (minimum detector ‘On’ time)
Notes
Min.
90.0
5.0
Typ.
-
-
Max. Units
-
ms
72.0
-
ms
Rx Modem Energy Detector
Detect threshold (‘Off’ to ‘On)
Undetect threshold (‘On’ to ‘Off’)
Hysteresis
Detect (‘Off’ to ‘On’) response time
DPSK modes
300 and 1200 baud FSK modes
150 and 75 baud FSK modes
Undetect (‘On’ to ‘Off’) response time
DPSK modes
300 and 1200 baud FSK modes
150 and 75 baud FSK modes
Notes
10,11
10,11
10,11
Min.
-
-48.0
2.0
10,11 10.0
10,11 8.0
10,11 16.0
10,11 10.0
10,11 10.0
10,11 20.0
Typ.
-
-
-
-
-
-
-
-
-
Max.
-43.0
-
-
Units
dBm
dBm
dB
35.0 ms
30.0 ms
60.0 ms
55.0 ms
40.0 ms
80.0 ms
Rx Answer Tone Detectors
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
‘Will detect’ frequency
‘Will not detect’ frequency
2225Hz detector
‘Will detect’ frequency
‘Will not detect’ frequency
Notes
10,12
10,12
10,12
10,12
10,12
Min.
-
-48.0
2.0
30.0
7.0
2050
-
2160
2335
Typ.
-
-
-
33.0
18.0
-
-
-
-
Max.
-43.0
-
-
45.0
25.0
Units
dBm
dBm
dB
ms
ms
2160 Hz
2000 Hz
2285 Hz
-
Hz
Rx Call Progress Energy Detector
Bandwidth (-3dB points) See Figure 6a
Detect threshold (‘Off’ to ‘On)
Undetect threshold (‘On’ to ‘Off’)
Hysteresis
Detect (‘Off’ to ‘On’) response time
Undetect (‘On’ to ‘Off’) response time
Notes
10,13
10,13
10,13
10,13
10,13
Min.
275
-
-42.0
2.0
30.0
6.0
Typ.
-
-
-
-
36.0
8.0
Max.
665
-37.0
-
-
45.0
50.0
Units
Hz
dBm
dBm
dB
ms
ms
Notes:
11. Thresholds and times measured with random data for DPSK modes, continuous binary ‘1’ for
all FSK modes. Fixed compromise line equaliser enabled. Signal switched between off and -
33dBm
12. ‘Typical’ value refers to 2100Hz or 2225Hz signal switched between off and -33dBm. Times
measured wrt. received line signal
13. ‘Typical’ values refers to 400Hz signal switched between off and -33dBm
© 2000 Consumer Microcircuits Limited
41
D/867/1
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