TDA1548T データシートの表示（PDF） - Philips Electronics

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TDA1548T

Bitstream continuous calibration filter-DAC with headphone driver and DSP

Philips Electronics 

Philips Semiconductors

Bitstream continuous calibration filter-DAC

with headphone driver and DSP

Product specification

TDA1548T

FEATURESPRODUCT SPECIFICATION

Easy application

• Only first-order analog post-filtering required

• Headphone amplifiers and digital filter integrated

• Component saving common headphone output

• Selectable system clock (SYSCLK) 64fs, 256fs or 384fs

• 16, 18 or 20 bits I2S-bus or LSB justified serial input

format

• Input pins suitable with 5 V low supply voltage

interfacing

• Small package (SSOP28)

• Single rail supply (3 V).

High performance

• Superior signal-to-noise ratio

• Wide dynamic range

• Continuous calibration digital-to-analog conversion

combined with noise shaping technique.

Features

• Low power dissipation

• Digital volume control

• Soft mute

• Digital tone control (Bass Boost and Treble)

• Digital de-emphasis

• Analog control of digital sound control functions.

GENERAL DESCRIPTION

The TDA1548T is a dual CMOS digital-to-analog converter

(DAC) with up-sampling filter and noise shaper and

integrated headphone driver featuring unique signal

processing functions. The digital processing features are

of high sound processing quality due to the wide dynamic

range of the bitstream conversion technique.

The TDA1548T supports the I2S-bus data input mode with

word lengths of up to 20 bits and the LSB justified serial

data input format with word lengths of 16, 18 or 20 bits.

The clock system is selectable (64fs, 256fs or 384fs) by

means of selection pins. Two cascaded half band filters,

linear interpolator and a sample-and-hold function

increase the oversampling rate from 1fs to 64fs.

A second-order noise shaper converts this oversampled

data into a bitstream for the 5-bit continuous calibration

DACs.

On board amplifiers convert the output current to a voltage

signal capable of driving a headphone or line output.

The common operational amplifier application eliminates

the need for capacitors.

The TDA1548T has some sound processing functions

which are controllable by a potentiometer. These functions

are volume, bass boost and treble. The flat/min/max

switch can also be controlled by a potentiometer.

The analog values are converted to a digital code, which is

then further translated internally to a set of coefficients for

either volume, bass boost or treble.

ORDERING INFORMATION

TYPE

NUMBER

TDA1548T

TDA1548TZ

NAME

SO28

SSOP28

PACKAGE

DESCRIPTION

plastic small outline package; 28 leads; body width 7.5 mm

plastic shrink small outline package; 28 leads; body width 5.3 mm

VERSION

SOT136-1

SOT341-1

1995 Nov 15

2

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