GENERAL DESCRIPTION

The TDA1388 CMOS digital-to-analog bitstream converter incorporates an up-sampling digital filter and noise shaper, unique signal processing features and integrated line and headphone drivers. The digital processing features are of high sound quality due to the wide dynamic range of the bitstream conversion technique.

The TDA1388 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 and 20 bits. Two cascaded half-band filters and a sample-and-hold function increase the oversampling rate from 1fs to 64fs. A 2nd-order noise shaper converts this oversampled data to a bitstream for the 5-bit continuous calibration Digital-to-Analog Converters (DACs).

On board amplifiers convert the output current to a voltage signal capable of driving a line output. The signal is also used to feed the integrated headphone amplifiers. The volume of the headphone is controlled by an external potentiometer.

The TDA1388 has special sound processing features for use in CD-ROM audio applications, which can be controlled by static pins or microcontroller interface. These functions are de-emphasis, volume, bass boost, treble, soft mute and the channel manipulation functions needed for ATAPI-compliant functionality in CD-ROM audio processing.

FEATURES

Multiple format input interface

• I2S-bus and LSB-justified input format compatible

• 1fs input format data rate.

Extensive channel manipulation features

• Separate soft mute on left and right channel

• Channel interchange function (left to right and right to left)

• Monaural function (left to right or right to left)

• True mono function 1⁄2(left plus right).

Digital sound processing

• Separate digital volume control for left and right channels

• Digital tone control, bass boost and treble

• dB-linear volume and tone control (low microcontroller load)

• Digital de-emphasis

• Soft mute.

Advanced audio output configuration

• Stereo line output (under microcontroller volume control)

• Stereo headphone output (under 5-tap potentiometer volume control)

• Line output independent of headphone output volume

• Power on/off click prevention circuitry

• High linearity, dynamic range, low distortion.

General

• Integrated digital filter plus DAC plus headphone driver

• No analog post filter required

• Easy application

• Functions controllable by static pins or by microcontroller interface

• 5 V power supply

• Low power consumption

• Small package size (SO28 and SSOP28).