STMicroelectronics TDA7580

Overview

TDA7580 from STMicroelectronics is a mixed-signal FM/AM digital IF sampling processor implementing on-chip 10.7 MHz band-pass ΣΔ ADC, 24-bit DSP core, stereo decoder, RDS demodulator/decoder, and dual-channel SAI with asynchronous sample rate converter. It performs real-time FM adjacent channel suppression, multipath reception enhancement, and weak-signal processing in automotive radio front-ends.

For engineers reviewing the TDA7580 datasheet, TDA7580 pinout, TDA7580 application, or TDA7580 equivalent, key selection criteria include its 10.7 MHz IF ADC performance, dual-mode (FM/AM) baseband processing capability, HS3I interface for tuner diversity, and I²C/SPI programmability with embedded RDS engine operating independently of main DSP load.

Technical Context

The TDA7580 integrates a dedicated IF band-pass ΣΔ ADC with internal 2.65 V/1.65 V/0.65 V reference generation for differential 10.7 MHz IF signal digitization, followed by a configurable 24-bit DSP core executing CORDIC-based AM/FM detection, stereo decoding, and spike/noise blanking algorithms. Its clock generation unit supports 74.1 MHz crystal input with programmable division for tuner reference clock synthesis.

It features two independent serial audio interfaces (SAI0/SAI1) supporting master/slave I²S and custom protocols, each with fully asynchronous sample rate conversion (ASRC) enabling internal ~36 kHz audio output to be upconverted to standard rates (e.g., 44.1 kHz or 48 kHz). The HS3I high-speed synchronous interface operates at MPX data rate for antenna/tuner diversity communication with low EMI impact.

Key Specifications

Pinout & Package

LQFP64 package with 0.5 mm pitch, thermally enhanced exposed pad (EPAD), and four independent power/ground domains: VDD (1.8 V core), VDDH/VDDOSC/VDDSD (3.3 V I/O/oscillator/ADC), VDDMTR (1.8 V tuner clock/AGC), and segregated analog/digital grounds (GNDSD, GNDOSC, GNDMTR, GND, GNDH).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FM/AM digital IF processing applications.

Compared with Si4790x and AK2301, the TDA7580 uniquely combines autonomous RDS decoding, HS3I-based tuner diversity, and dual ASRC-equipped SAIs-making it optimal for high-reliability automotive radios reusing legacy tuner designs while meeting EN 50373 multipath robustness requirements.

Availability

TDA7580 is available at Aetrix Electronics and suitable for automotive infotainment systems, professional broadcast monitoring receivers, and marine VHF/FM communication systems requiring stable component supply across extended temperature ranges (−40°C to +125°C).

Supply support for TDA7580 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with strong analog/mixed-signal heritage.

The TDA7580 belongs to ST's automotive radio processor product line, designed specifically to replace multi-chip analog IF chains with a single-programmable digital solution for EMI-resilient, high-fidelity broadcast reception in harsh vehicular environments.

FAQ

What is the function of the AGCKEY pin on the TDA7580?

The AGCKEY pin is a dedicated 1.5 kΩ ±30% output impedance DAC delivering a 1 Vpp ±1% analog voltage to control the AGC input of companion tuners like the TDA7515. It operates from the VDDMTR (1.8 V) supply and is synchronized to the internal DSP timing, enabling precise, low-jitter gain adjustment during weak-signal acquisition without host processor involvement.

Does the TDA7580 require an external crystal, and what frequency is needed?

Yes, the TDA7580 requires a 74.1 MHz fundamental-mode quartz crystal connected between XTI and XTO pins. This crystal feeds the on-chip oscillator and clock generation unit (CGU), which derives all internal clocks-including the 100 kHz FM or 18 kHz AMEU tuner reference clocks-and provides the master timing source for the IF ADC and DSP core.

Can the TDA7580 operate without running the main DSP firmware?

Yes-the RDS subsystem operates autonomously after boot: once configured via I²C/SPI, it continuously demodulates and decodes RDS data in parallel with FM/AM processing, generating interrupts (RDS_INT) for traffic announcements without consuming DSP cycles. However, full FM/AM baseband processing (equalization, stereo decode, noise blanking) requires loaded DSP firmware.

How does the HS3I interface differ from standard SPI or I²C in tuner diversity applications?

The HS3I is a high-speed synchronous serial interface optimized for MPX-rate data exchange (up to 2.048 Mbps) between two TDA7580 devices or between TDA7580 and tuner ICs. Unlike SPI/I²C, it uses dedicated clock/data lines (IQSYNC, IQCH1–IQCH3) with hardware-level timing control, eliminating protocol overhead and jitter-critical for real-time antenna diversity switching with sub-50 µs latency and minimal EMI coupling into sensitive IF paths.