전자부품 데이터시트 검색엔진 |
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TEA1094AM 데이터시트(PDF) 10 Page - NXP Semiconductors |
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TEA1094AM 데이터시트(HTML) 10 Page - NXP Semiconductors |
10 / 28 page 1996 Jul 15 10 Philips Semiconductors Product specification Hands free IC TEA1094; TEA1094A To determine the noise level, the signals on TENV and RENV are buffered to TNOI and RNOI. These buffers have a maximum source current of 1 µA and a maximum sink current of 120 µA. Together with the capacitors CTNOI and CRNOI, the timing can be set. In the basic application of Fig.13 the value of both capacitors is 4.7 µF. At room temperature, the 1 µA sourced current corresponds to a maximum rise-slope of the noise envelope of approximately 0.07 dB/ms. This is small enough to track background noise and not to be influenced by speech bursts. The 120 µA current that is sunk corresponds to a maximum fall-slope of approximately 8.5 dB/ms. However, during the decrease of the signal envelope, the noise envelope tracks the signal envelope so it will never fall faster than approximately 0.7 dB/ms. The behaviour of the signal envelope and noise envelope monitors is illustrated in Fig.8. Fig.7 Signal and noise envelope detectors. handbook, full pagewidth MGD223 LOG 28 (24) 27 (23) 26 (22) 25 (21) 24 (20) 23 (19) LOG from microphone amplifier from loudspeaker amplifier DUPLEX CONTROLLER TSEN RTSEN CTSEN CTENV CTNOI RRSEN CRSEN CRENV CRNOI TENV TNOI RSEN RENV RNOI to logic to logic The pin numbers given in parenthesis refer to the TEA1094A. handbook, full pagewidth MBG354 INPUT SIGNAL SIGNAL ENVELOPE NOISE ENVELOPE 4 mV (RMS) 1 mV (RMS) A C C 36 mV 36 mV B B B A B time A: 85 dB/ms B: 0.7 dB/ms B: 0.7 dB/ms C: 0.07 dB/ms Fig.8 Signal and noise envelope waveforms. |
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