TDA7500A Datasheet TDA7500A, TDA7500ATR | P34-P36

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TDA7500A

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Codec

The CODEC is composed of four AD mono converters, three DA stereo converters. The ADC can operate

both in audio mode and in FM/AM mode. When in audio mode, it converts the audio bandwidth from 20 to

20KHz. The A to D is a third order Sigma-Delta converter, the converter resolutions is 20 bit with 88 dB of

dynamic range and 85dB of total harmonic distortion. When in FM mode, the converted bandwidth is up

to 192KHz. The D to A is a third order Sigma-Delta converter with a low noise reconstructing analog filter,

the converter resolution is 20 bit with 93 dB of dynamic range and 85dB of total harmonic distortion. All

the reference voltages are generated inside the chip.

Some capabilities of the CODEC are listed below:

■

20-Bit Resolution

■

Digital Anti-Alias Filtering embedded

■

Adjustable System Sampling Rates

■

93dB D/A Dynamic Range (Not-Weighted)88dB A/D Dynamic Range (Not-Weighted)

■

85dB D/A (THD+N/S)85dB A/D (THD+N/S)

■

Internal Differential Analog Architecture

■

+3.3V Power Supply

SOFTWARE FEATURES

A great flexibility is guaranteed by the two programmable DSP cores. A list of the main software functions

which can be implemented in the TDA7500A is enclosed hereafter. A block diagram of the audio process-

ing flow is shown in Fig. 19 below.

Figure 19. Software Block Diagram of Audio & Sound Processing

AM/FM Baseband Signal Processing

■

FM weak signal processing

■

Integrated 19 kHz MPX filter and deemphasis

■

flexible noise cancellation

■

flexible multipath detector

Generic Audio Signal Processsing

■

Loudness

■

Bass, treble, fader control

■

Volume control

DLY

HPPEQTBLDDRC

ANR SM

DLY

HPPEQTBLDDRCANR SM

DLY

Audio

noise

reduction

namic

ran

compression

Loudness

Bass Treble Parametric

ualiser

Soft

mute

Routin

matrix

Delay

Stereo

input

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TDA7500A

■

Distortion Limiting

■

Premium Equalization

■

Soft mute

TAPE Signal Processsing

■

Dolby B Noise Reduction

■

Automatic Music Search

CD Signal Proceessing

■

Dynamic Range Compression

Audiophile

■

Parametric Equalization

■

Crossover

■

Channel Delays

■

Center Channel Imaging Output

■

Audio Noise Reduction

Other

■

Voice compression/decompression for TIM storage

■

Echo and noise cancelling for mobile phone connection

Application Scheme

The TDA7500A can operate as a standalone device either it can interface the TDA7501 which contains

the analog input multiplexer, analog volume control and the line-driver. The FM_MPX and FM_LEVEL sig-

nals coming from the tuner and other signals supplied by analog sources are adapted by the TDA7501

and fed to the TDA7500A. A block diagram of the system is shown in Fig. 20 below.

The TDA7500A converts all the analog signals into digital domain and performs AM/FM processing and

audio/sound processing. Thanks to this, it is possible to process any audio source as well analog as digital

in parallel, to record FM mono for traffic information, telephone response, navigation and RDS. Finally the

digital signals are D/A converted and sent to the TDA7501 for the final level adjustment and for the analog

volume control.

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Figure 20. lock Diagram of Car Amplifier Audio Sub-System.

Clock Scheme

When TDA7500A is used in AD/FM mode the following scheme is choosen in order to avoid harmonics inside

the FM band. Parts of the system are directly clocked by the crystal oscillator, whereas other parts are driven

by the pll oscillator. Thanks to this it is possible to process any audio source as well analog as digital in parallel

to record FM mono for traffic informations, telephone resp. navigation and RDS. Figure 21 shows the clock

scheme. Regarding on the country and its FM bandwidth different crystals should be selected.

Figure 21. Clock Scheme

TDA7501

ANALOG INPUT

TDA7500A

FRONT END

TDA7421

AUDIO POWER

DISPLAY

MICRO

DIGITAL OUT

MAIN

MICRO

DRAM/

SRAM

EEPROM/

FLASH

DIGITAL IN

SPDIF

C/SPI

Fig20TDA7500A

A/D D/A

Int./Ext.

8.55 MHz

Fext: 44.1 kHz, 48kHz

OSC

Fcomp: 1.425 MHz (8.55/6)

1.411 MHz (44.1*2*16)

1.536 MHz (48*2*16)

Fvco:

173.85 MHz (Fcomp*122)

158.05 MHz (Fcomp*112)

172.03 MHz (Fcomp*112)

A/D

FM-mpx/

stereo audio

A/D

mono

level / tel. / navi.

A/D

FM-rds /

noise det.

RDS

-Demod.

Audio

DSP

D/A

Coverters

Fconverter:

12.42 MHz (Fvco/14)

11.29 MHz (Fvco/14)

12.29 MHz (Fvco/14)

Fdsp:

43.46 MHz (Fvco/4)

39.51 MHz (Fvco/4)

43.01 MHz (Fvco/4)

PLL

Stereo

DSP

Faudio: 48.51 kHz

44.1 kHz

48 kHz

Frds:

8.55 MHz (Fxtal)

Xtal

FM Japan West Europe East

76..90

87.5..108 65..74[MHz]

86.92

8.89 MHz

90.38

2nd

Hamonics

3rd

Hamonics

135.57

130.38

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TDA7500A

Mfr. #:

Buy TDA7500A

Manufacturer:

STMicroelectronics

Description:

IC PROCESSOR AM/FM DGTL 100-TQFP

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