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TEA7089A Arkusz danych(PDF) 7 Page - STMicroelectronics |
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TEA7089A Arkusz danych(HTML) 7 Page - STMicroelectronics |
7 / 17 page ELECTRICAL SPECIFICATIONS (continued) DTMF Generator (Tamb =25 °C; RL = 660Ω) Symbol Parameter Test Conditions Min. Typ. Max. Unit Amf Tone Frequency Accuracy Test 6 Pin Osc fclock = 1.79MHz oscillator off or Resonator : 3.58MHz oscillator on C13 =100nF, IL = 22mA - 0.4 0.4 % Llf Lhf Low Freq. Group Line Level High Freq. Group Line Level -10 -8 -8.5 -6.5 -7 -5 dBm dBm Pmf Preemphasis HF/LF +1 +2 +3 dB tDON tDOFF Rise Time Decay Time 5 5 ms ms Cmf DTMF Confidence Tone : Earphone level (low freq.) Earphone level (high freq.) 13 17 17 22 21 27 mV mV – - Unwanted Harmonics Level (see Figure 6) –––– 100 1k 10k 100k 1M -90 -70 -50 -30 (Hz) Figure 6 : Unwanted Harmonics Level in DTMF V REF I I S tart-u p I S pe ech V L I (In Ring) 18 V RING 26 V RMC (3 .4 V) 13 C15 10 F P +LCD C10 47 F 5.6 V V MC Ba tte ry kIL Figure 7 : Microcontroller Interface TEA7089A 7/17 |
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