TDA7500A Datasheet, PDF (34/40 Pages) STMicroelectronics – DIGITAL AM/FM SIGNAL PROCESSOR

TDA7500A
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
DLY
RF
ANR DRC LD
B
T
PEQ SM
HP
DLY
CF
Stereo
input
+
RM DLY
LF
ANR DRC LD
B
T
PEQ SM
HP
DLY
RR
DLY
LR
Audio Dynamic Loudness Bass Treble Parametric _Soft
Routing Delay
noise range
reduction compression
equaliser mute
LP ^matrix
SW
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
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