UCB1300BE 데이터 시트보기 (PDF) - Philips Electronics

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UCB1300BE

Advanced modem/audio analog front-end

Philips Electronics 

Philips Semiconductors

Advanced modem/audio analog front-end

48dB

24dB

0dB

21dB

Preliminary specification

UCB1300

0dB

24dB

48dB

programmed attenuation

69dB

Fig.5 Analog and digital attenuation settings audio output path.

The output level can be attenuated in 3 dB steps down to -69 dB. The first 8 attenuation steps (0 to 21 dB) are

implemented in the analog domain. The digital up sample filter contains a 24 dB and a 48 dB attenuation setting. This

arrangement preserves the resolution, thus the ‘audio quality’ of the audio output signal for attenuation settings till 21 dB.

The speaker driver is muted when AUDIO_MUTE 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 circuit.

The speaker driver is designed to directly drive a bridge tied load (BTL). This yields the highest output power and this

arrangement 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

UCB1300 by a factor of 2. Fig.6 shows possible ways to connect a speaker to the driver. Loading the amplifiers with a

capacitive load may cause high frequency oscillations and should be done cautiously.

1999 Jul 20

10

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