TDA1306T/N2 查看數據表（PDF） - Philips Electronics

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TDA1306T/N2

Noise shaping filter DAC

Philips Electronics 

Philips Semiconductors

Noise shaping filter DAC

Product specification

TDA1306T

There are two recommended application situations within

the microcontroller mode:

• The customer wants to use the microcontroller interface

without the volume setting facility. In this event the

operation is as follows:

– Mute ON; by sending the MUSB command

– Mute OFF; by sending the FS command

– Attenuation ON; by sending the ATSB command

– Attenuation OFF; by sending the FS command.

It is possible to switch from ‘Attenuation ON’ to ‘Mute

ON’ but not vice-versa.

• Incorporating the volume control feature operates as

follows:

– Mute ON; by sending the MUSB command the

microcontroller has to store the previous volume

setting

– Mute OFF; by sending succeeding INCR commands

until the previous volume is reached

– Attenuation ON; by sending succeeding DECR

commands until a relative downstep of −12 dB is

reached.

The microcontroller has to store the previous volume

– Attenuation OFF; by sending the succeeding INCR

commands until the previous volume is reached

– Volume UP; by sending succeeding INCR

commands

– Volume DOWN; by sending succeeding DECR

commands.

Double-speed mode

The double-speed mode is controlled by the DSMB bit at

register D6 (microcontroller application mode) or by

activating the APP1 pin (pseudo-static application mode).

When the control bit is active LOW the device operates in

the double-speed mode.

Oversampling filter and noise shaper

The digital filter is a four times oversampling filter.

It consists of two sections which each increase the sample

rate by 2. The noise-shaper operates on 4fs and reduces

the in-band noise density.

DAC and operational amplifiers

In this noise shaping filter DAC a special data code and

bidirectional current sources are used in order to achieve

true low-noise performance. The special data code

guarantees that only small values of current flow to the

output during small signal passages while larger positive

or negative values are generated using the bidirectional

current sources. The noise shaping filter-DAC uses the

continuous calibration conversion technique.

The operational amplifiers and the internal conversion

resistors RCONV1 and RCONV2 convert the DAC current to

an output voltage available at VOL and VOR. Connecting an

external capacitor between FILTCL and VOL, FILTCR and

VOR respectively provides the required 1st-order post

filtering.

De-emphasis

A digital de-emphasis is implemented in the TDA1306T.

By selecting the DEEM bit at register D4 (microcontroller

application mode) or activating the APP3 pin

(pseudo-static application mode), de-emphasis can be

applied by means of an IIR filter. De-emphasis is

synchronized to prevent operation in the middle of a word.

1998 Jan 06

11

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