TDA9875 datasheet(18/92 Pages) PHILIPS

18 / 92 page

1998 Feb 13

Philips Semiconductors

Preliminary speciﬁcation

Digital TV Sound Processor (DTVSP)

TDA9875

6.3.6

LOUDSPEAKER (MAIN) AND HEADPHONE

(AUXILIARY) OUTPUTS

Signals from any audio source can be applied to the

loudspeaker and to the headphone output channels via the

digital crossbar switch and the DSP.

6.3.7

DUAL AUDIO DAC

The TDA9875 contains three dual audio DACs, one for the

connection from the DSP to the analog crossbar switch

section and two for the loudspeaker and headphone

outputs. Each of the three dual low-noise high-dynamic

range DACs consists of two 15-bit DACs with current

outputs, followed by a buffer operational amplifier.

The audio DACs operate with four-fold oversampling and

noise shaping.

6.3.8

DUAL AUDIO ADC

There is one dual audio ADC in the TDA9875 for the

connection of the analog crossbar switch section to the

DSP. The dual audio ADC consists of two bitstream

3rd-order sigma-delta audio ADCs and a high-order

decimation filter.

6.3.9

STANDBY MODE

The standby mode (subaddress 1, bit 5) disables most

functions and reduces power dissipation. The analog

crossbar switch and the SCART section remains

operational and can be controlled by the I2C-bus to

support copying of analog signals from SCART 1 to

SCART 2 and vice versa.

Unused internal registers may lose their information in

standby mode. Therefore, the device needs to be

initialized on returning to normal operation. This can be

accomplished in the same way as after a power-on reset.

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