UCB1300 데이터 시트보기 (PDF) - Philips Electronics

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UCB1300

Advanced modem/audio analog front-end

Philips Electronics 

Philips Semiconductors

Advanced modem/audio analog front-end

Preliminary specification

UCB1300

MICP

AUD_GAIN[4,3]

AUD_OFF_CAN AUD_LOOP AUD_GAIN[2..0]

1bit ADC

DIGITAL

12

DECIMATION

FILTER

MICGND

AUD_IN_ENA

VCCSPKR

SPKRP

SPKRN

VSSSPKR

AUD_OUT_ENA

4bit DAC

DIGITAL

ATTENUATOR

DIGITAL

12

NOISE

SHAPER

AUD_MUTE AUD_ATT[2..0]

AUD_ATT[4,3]

Fig.3 Audio codec block diagram.

The audio sample rate (fsa) is derived from the SIB interface clock pin (SIBCLK) and is programmable through the SIB

interface using AUD_DIV[n]. The audio sample rate is given by the following equation:

fsa = (---6---4---(--×2-----A×----U-f--S-D--I--B-_--C-D---L-I--KV---)-[--n---]--)

(7< AUD_DIV[n] < 128)

For example, a serial clock of 9.216 MHz, with a divisor of 12, results in an audio sample rate of 24.0 kHz. Both the rising

and the falling edges of SIBCLK are used in case AUD_DIV[n] is set to an odd number, which demands a 50% duty cycle

of SIBCLK to obtain time equidistant sampling.

1999 Jul 20

8

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