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UCB1300BE Datasheet(PDF) 9 Page - NXP Semiconductors |
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UCB1300BE Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 56 page  1999 Jul 20 9 Philips Semiconductors Preliminary specification Advanced modem/audio analog front-end UCB1300 The UCB1300 audio codec input path accepts microphone signals directly, only a DC blocking capacitor is needed since the MICP input is biased around 1.4V. The ‘ground’ side of the microphone is either connected to the analog ground (Vssa1) or to the MICGND pin. The latter will decrease the current consumption of active microphones, since the MICGND pin is made Hi-Z when the audio codec input path is disabled. The full scale input voltage of the audio input path is programmable in 1.5 dB steps by setting the appropriate number in AUDIO_GAIN[n] in the audio control register A. Using very high gains may require the use of the internal offset cancellation circuit programmable in reg 13 to avoid clipping in the ADC. A clip detection circuit will inform the user whenever the input voltage exceeds the maximum input voltage, since this will lead to a high distortion. In that case AUD_CLIP_STAT in the audio control register B is set. When ACLIP_RIS_INT is set, an interrupt is generated on the IRQOUT pin on the rising edge of the clip detect signal. When ACLIP_FAL_INT is set, an interrupt is generated on the falling edge of the clip detect signal. The frequency response of the audio codec depends mainly on the selected sample rate, since the bandwidth is limited in the down and up sampling filters. These digital filters both contain several FIR and IIR low pass filters and a DC removal filter (high pass filter). A 3rd order smoothing filter is implemented in the DAC path, between DAC and speaker driver stage to reduce the spurious frequencies at the speaker outputs. Fig.4 Possible microphone connections. PASSIVE VDDA1 1 7 21 MICP MICGND 20 VSSA1 18 ACTIVE VDDA1 1 7 21 MICP MICGND 20 VSSA1 18 UCB1300 UCB1300 |
Similar Part No. - UCB1300BE |
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Similar Description - UCB1300BE |
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