TDA7580 STMicroelectronics, TDA7580 Datasheet - Page 6

• Manufacturer Part Number: TDA7580
• Description: IC PROC FM/AM IF SAMPLING 64LQFP
• Manufacturer: STMicroelectronics

Specifications of TDA7580

• Function: FM/AM Processor
• Frequency: 10.7MHz Center
• Rf Type: AM, FM
• Secondary Attributes: On-Chip A/D Converter
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Overview
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Overview
The algorithm is self-adaptive, thus it requires no “on-the-field” adjustments after the
parameters optimization.
The chip embeds a Band Pass Sigma Delta Analogue to Digital Converter for 10.7MHz IF
conversion from a “tuner device” (the TDA7515 is highly recommended).
The 24bit DSP allows flexibility in the algorithms implementation, thus giving some freedom
for customer required features. The total processing power offers a significant headroom for
customer’s software requirement, even when the channel equalization and the decoding
software is running. the program and data memory space can be loaded from an external
non volatile memory via I
The oscillator module works with an external 74.1MHz quartz crystal. It has very low electro
magnetic interference, as it introduces very low distortion, and in any case harmonics fall
outside the radio bandwidth.
The companion tuner device receives the reference clock through a differential ended
interface, which works off the oscillator module by properly dividing down the master clock
frequency. That allows the overall system saving an additional crystal for the tuner.
After the IF conversion, the digitized baseband signal passes through the base band
processing section, either FM or AM, depending on the listener selection. The FM base
band processing comprises of stereo decoder, spike detection and noise blanking. The AM
noise blanking is fully software implemented.
The internal RDS filter, demodulator and decoder features complete functions to have the
output data available through either I
start-up, so that RDS can work in background and in parallel with other DSP processing.
This mode (RDS only) allows current consumption saving for low power application modes.
An I
well as RDS data interface. The DSP SPI block embeds a 10 words FIFO for both transmit
and receive channels, to lighten the DSP task and frequently respond to the interrupt from
the control interface.
Serial audio interface (SAI) is the ideal solution for the audio data transfer, both transmit and
receive: either master or slave. The flexibility of this module gives a wide choice of different
protocols, including I
clocks allows the use of TDA7580 as general purpose digital audio processor.
A fully asynchronous sample rate converter (ASRC) is available as a peripheral prior to
sending audio data out via the SAI, so that internal audio sampling rate (~36kHz and
FM/AM mode) can be adapted by upconversion to any external rate.
An inter processor transport interface (HS
also available for a modular system which implements Dual Tuner Diversity, thus enhancing
the overall system performance. It is about a synchronous serial interface which exchanges
data up to the MPX rate. It has been designed to reduce the electro magnetic interference
toward the sensitive analogue signal from the tuner.
General purpose I/O registers are connected to and controlled by the DSP, by means of
memory map.
A debug and test interface is available for on chip software debug as well as for internal
registers read/write operation.
2
C/SPI interface is available for any control and communication with the main micro, as
2
S. Two fully independent bidirectional data channels, with separate
2
C or SPI.
2
C or SPI interface. No DSP support is needed but at
3
I, high speed synchronous serial interface) is
TDA7580