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CMX625 Datasheet(PDF) 29 Page - CML Microcircuits

Part # CMX625
Description  ISDN TA POTS Interface
PDF  34 Pages
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Manufacturer  CMLMICRO [CML Microcircuits]
Direct Link  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

CMX625 Datasheet(HTML) 29 Page - CML Microcircuits

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



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