CMX625 查看數據表（PDF） - CML Microsystems Plc
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CMX625 Datasheet PDF : 34 Pages
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ISDN TA POTS Interface
CMX625
DTMF Decoder
Valid input signal levels
(each tone of composite signal)
Not decode level
(either tone of composite signal)
Twist = High Tone/Low Tone
Frequency Detect Bandwidth
Dial Tone Tolerance
Noise Tolerance
Tone Response time
Tone De-response time
Tone burst detected
Tone burst ignored
Pause length detected
Pause length ignored
Notes Min.
4
-29.0
4
-
-9.0
±1.8
6
-
6,7
-
2
-
2
-
2
40.0
2
-
2
40.0
2
-
SPM Signal Level
Level at SPM pin
Tone frequency accuracy
Tone output distortion
Output Impedance
Notes
4, 9
4, 9, 10
5
Min.
-1.5
-1.0
-14.0
-
-
PCM Codec-Filter
PCM Codec-Filter
Passband
Passband Gain (at 1.02kHz)
Passband Ripple (w.r.t. gain at 1.02kHz)
Stopband Attenuation
Group delay
Absolute
Relative to 1kHz:
500Hz
600Hz
2600Hz
2800Hz
Signal-to-total distortion ratio as a function of input
level (1kHz input level):
-45dBm
-40dBm
-30dBm
0dBm
Variation of gain with input level (1kHz input signal)
-55dBm0
-50dBm0
-40dBm0
+3dBm0
Idle channel noise
Output Impedance
Notes
8
8
8
8
11
11
11
11
11
Min.
300
-
-0.5
-
-
-
-
-
-
22.0
27.0
33.0
33.0
-3.0
-1.0
-0.5
-0.5
-
-
Typ.
-
-
-
-
-
-14
-
-
-
20.0
-
-
Typ.
0
0
-
1.2
10.0
Typ.
-
0
-
30.0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1.0
Max.
-2.0
-40.0
10.0
±4.5
0
-
40.0
45.0
-
-
-
20.0
Max.
1.0
0.5
14.0
-
-
Max.
3400
-
+0.5
-
600
1.5
0.75
0.25
1.5
Unit
dBm
dBm
dB
%
dB
dB
ms
ms
ms
ms
ms
ms
Unit
dBm
dB
Hz
%
kΩ
Unit
Hz
dB
dB
dB
µs
ms
ms
ms
ms
-
-
-
-
+3.0
+1.0
+0.5
+0.5
-65.0
-
dBp
dBp
dBp
dBp
dB
dB
dB
dB
dBm0p
kΩ
2001 Consumer Microcircuits Limited
29
D/625/2
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