UDA1343TT Просмотр технического описания (PDF) - Philips Electronics

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UDA1343TT

Economy audio CODEC with features

Philips Electronics 

Philips Semiconductors

Economy audio CODEC with features

Preliminary specification

UDA1343TT

Digital mixer

The UDA1343TT has a digital mixer which can mix the

ADC signal to the playback signal. A functional block

diagram of the mixer mode is given in Fig.4.

When the device is in mixer mode, care is taken to avoid

clipping. This is done by reducing both signals by −6 dB

before mixing. After mixing there is master volume and

mute, after which the signal is reamplified digitally by 6 dB.

The codec can be set to mixer mode via the L3 interface

by setting the MIX bit HIGH.

In the mixer mode there are 3 volume and mute controls

available; one for the ADC channel, one for the playback

channel and one for the master (equal sum) signal.

All three volume ranges can be controlled in 0.25 dB

steps.

In the mixer mode, the ADC volume control is used for

mixing purposes. The decimator output signal can be

output from the chip before the ADC volume control or

after the ADC volume control. This can be set via the L3

interface using the ADC output select bit.

handbook, full pagewidth

from ADC

and decimator

ADC volume + mute

DIGITAL

DC FILTER

VOLUME +

MUTE

−6 dB

master volume + mute

+

VOLUME +

MUTE

+6 dB

to interpolator

and DAC

ADC_OUT

select (L3)

I2S-bus

output

−6 dB

UDA1343TT

VOLUME + I2S-bus volume + mute

MUTE

I2S-bus

input

MGL888

Fig.4 Mixing feature in the UDA1343TT.

2000 Jan 12

9

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