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CMX625 датащи(PDF) 29 Page - CML Microcircuits |
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CMX625 датащи(HTML) 29 Page - CML Microcircuits |
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29 / 34 page ![]() 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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