Stereo Decoder TDA7338

TDA7338 Stereo Decoder

TDA7348 Digitally controlled audio processor

Features:

• Input multiplexer
• Three stereo and one mono inputs
• Selectable input gain for optimal adaptation to different sources
• Volume control in 0.3db steps including gain up to 20dB
• Zero crossing mute and direct mute
• Pause detector with programmable threshold
• Soft mute controlled by software or hardware PIN
• Bass and treble control
• Four speaker attenuators
• Four independent speakers control in 1.25dB steps for balance and fader facilities
• Independent mute function
• All functions programmable via serial I2C bus 

Description

The TDA7348 is an upgrade of the TDA7318 audioprocessor. Thanks to the used BIPOLAR/CMOS technology, very low distortion, low noise and DC-stepping are obtained. Due to a highly linear signal processing, using CMOS-switching techniques  instead of standard bipolar multipliers, very low distortion and very low noise are obtained Several new features like softmute, zero-crossing mute and pause detector are implemented. The Soft Mute function can be activated in two  ways, either via the serial bus (bit D0, Mute Byte),  or directly on pin 22 through an I/O line of the  microcontroller Very low DC stepping is obtained by use of a BICMOS technology.

Circuit Diagram:

Circuit Diagram

Datasheet TDA7348: Download

Dual bridge audio amplifier for car radio

Features:

Minimum external component count

No bootstrap capacitors

No Boucherot cells

Clip detector output

High output power

Fixed gain

Very low stand-by current (1 µA typ)

No switch on/off noise

Description

The TDA7374 is a class AB audio dual bridge power amplifier in Multiwatt package designed for car radio applications. Thanks to the fully complementary PNP/NPN  output configuration the high power performances  of the TDA7374 are obtained without bootstrap 

capacitors.

Circuit Diagram:

PCB Layout Dual bridge audio amplifier for car radio

Circuit diagram for dual bridge audio amplifier for car radio

Stereo Preamp

Circuit Diagram:

Stereo Preamp circuit diagram

Datasheet for TDA7336: Download

Low Noise Stereo Preamplifier

Low Noise Stereo Preamplifier

RDS Filter

General Description:

The TDA7332 is an RDS filter, realized in switched capacitor technique. The 4 biquad stage architecture is working with 4.332MHz clock. Optionally a 8.664MHz xtal can be used. The filter has a center frequency of 57KHz and a bandwidthof 3KHz. Input 2nd order antialiasing fiter and output smoothing filter are provided.

Circuit Diagram:

Circuit Diagram for RDS filter

Single chip RDS demodulator and filter

Features:

• HIGH PERFORMANCE, 57KHz BANDPASS FILTER (8th ORDER
• FILTER ADJUSTMENT FREE AND WITHOUT EXTERNAL COMPONENTS
• PURELY DIGITAL RDS DEMODULATION WITHOUT EXTERNAL COMPONENTS
• ARI (SK INDICATION) AND RDS SIGNAL QUALITY OUTPUT
• 4.332MHz CRYSTAL OSCILLATOR (8.664MHz OPTIONAL)
• 4.332MHz CRYSTAL OSCILLATOR (8.664MHz OPTIONAL)

General Description:

The TDA7330B is a RDA demodulator. It recovers the additional inaudible RDS information which is trasmitted by FM radio broadcasting stations. The output data signal and clock signal ca be furher processed by a suitable RDS decoder.

Circuit Diagram:

Circuit Diagram for single chip RDS demodulator and filter