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TDA7500A Datasheet(PDF) 34 Page - STMicroelectronics |
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TDA7500A Datasheet(HTML) 34 Page - STMicroelectronics |
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34 / 40 page  TDA7500A 34/40 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: s 20-Bit Resolution s Digital Anti-Alias Filtering embedded s Adjustable System Sampling Rates s 93dB D/A Dynamic Range (Not-Weighted)88dB A/D Dynamic Range (Not-Weighted) s 85dB D/A (THD+N/S)85dB A/D (THD+N/S) s Internal Differential Analog Architecture s +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 s FM weak signal processing s Integrated 19 kHz MPX filter and deemphasis s flexible noise cancellation s flexible multipath detector Generic Audio Signal Processsing s Loudness s Bass, treble, fader control s Volume control DLY DLY DLY HP PEQ T B LD DRC RM ANR SM + DLY HP PEQ T B LD DRC ANR SM DLY LP Audio noise reduction Dynamic range compression Loudness Bass Treble Parametric equaliser Soft mute Routing matrix Delay Stereo input RF CF LF RR LR SW |
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