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UCB1100 Datasheet(PDF) 9 Page - NXP Semiconductors |
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UCB1100 Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 36 page  Philips Semiconductors Preliminary specification UCB1100 Advanced modem/audio analog front-end 1998 May 08 9 micp micgnd vssa1 vdda1 micp micgnd vssa1 vdda1 UCB1100 UCB1100 ‘Passive’ Microphone ‘Active’ Microphone SN00129 Figure 4. Possible Microphone Connections The UCB1100 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 analogue ground (vssa1) or to the micgnd pin of the UCB1100. 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 1.5dB steps by setting the appropriate data in the audio-input-gain bits in the audio control register A. A clip detection circuit will inform the user whenever the input voltage exceeds the maximum input voltage. In that case the clip detect status bit in audio control register B is set. An interrupt is generated on the irqout pin of the UCB1100 whenever the enable audio clip detect rising interrupt or the enable audio detect falling edge interrupt bit is set in the rising edge interrupt enable or falling edge interrupt control register B is set. 0dB 24dB 48dB 0dB 21dB 24dB 48dB 69dB programmed attenuation SN00130 Figure 5. Analogue and Digital Attenuation Settings Audio Output Path The output level can be attenuated in 3dB steps down to -69dB. The 8 highest attenuation steps are implemented in the analogue circuitry, while the two 24dB steps are implemented in the digital domain. This preserves the ‘audio quality’ of the output signal at lowest attenuation settings. The speaker driver is muted when the audio-mute bit in the audio control register B is set. The speaker driver will remain activated in that case, however no signal is produced by the speaker driver circuitry. UCB1100 UCB1100 UCB1100 spkrp spkrn spkrp spkrp spkrn spkrn Bridge Tied Speaker Load Single Ended Speaker Connections SN00131 Figure 6. Possible Speaker Connections The speaker driver is designed to directly drive a bridge tied load (BTL). This yields the highest output power and it does not require external DC blocking capacitors. The speaker driver also accepts single ended connection of a speaker, in which case the maximum output power is reduced to a quarter of the BTL situation. Consequently this way of connecting the speaker to the speaker driver reduces the power consumption of the speaker driver in the UCB1100 by a factor of 2. Figure 6 shows possible ways to connect a speaker to the UCB1100. The audio input and output path are activated independently; the input path is enabled when the audio-input-enable bit is set, the output path is enabled when the audio-output-enable bit is set in the audio control register B. This provides the user the means to reduce the current consumption of the UCB1100 if one part of the audio codec is not used in the application. The audio codec has a loopback mode for system test purposes, which is activated when the audio_loopback enable bit in the audio control register B is set. This is an analogue loopback which internally connects the output of the audio output path to the input of the audio input path, (see Figure 3). In this mode the normal microphone input is ignored, but the speaker driver can be operated normally. |
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