STMicroelectronics TDA7502

Overview

TDA7502 from STMicroelectronics is a 24-bit fixed-point DSP IC designed for in-car remote amplifier audio processing, featuring a 50 MIPS core, 2×1024×24-bit X/Y data RAM, 3072×24-bit program RAM usable for acoustic delay, serial audio interface (SAI), SPI/I²C master/slave control interfaces, and integrated PLL clock oscillator. It enables parametric equalization, crossover filtering, dynamic compression, and stereo spatial enhancement in automotive head units and OEM amplifier modules.

For engineers reviewing the TDA7502 datasheet, TDA7502 pinout, TDA7502 application, or TDA7502 equivalent, this device is selected for high-fidelity real-time audio signal conditioning where deterministic latency, multi-channel SAI I/O, on-chip delay memory, and 5V-tolerant 3.3V GPIOs are required in cost-sensitive automotive infotainment systems.

Technical Context

The TDA7502 integrates a 24-bit Harvard-architecture DSP core with dual 56-bit accumulators, single-cycle MAC, convergent rounding, and programmable interrupt priorities - enabling deterministic execution of audio algorithms at up to 50 MHz. Its memory architecture includes separate X-RAM, Y-RAM, and 3072-word program RAM, allowing simultaneous data buffering and instruction fetch for low-latency FIR/IIR filtering.

It supports three independent stereo SAI channels (SDI0–2/SDO0–2) with configurable LRCLK/SCK polarity and direction, plus dual-mode SPI and I²C interfaces for host microcontroller coordination. The on-chip PLL generates internal clocks from an external 8–12.5 MHz crystal (XTI/XTO), with VCO output range of 70–140 MHz and lock time ≤3 ms.

Key Specifications

Pinout & Package

LQFP44 (10 × 10 × 1.4 mm) package with exposed thermal pad (PGND/PVCC pins 13–14), 44-pin quad flat pack optimized for automotive PCB thermal management and EMI control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive audio DSP applications.

Compared with TDA7502, TDA7535 offers integrated DAC and broader SAI configurability for simplified amplifier designs, while ADAU1701 provides higher bit-depth processing but lacks automotive-grade interfaces, thermal specs, and multi-channel digital I/O needed for OEM deployment.

Availability

TDA7502 is available at Aetrix Electronics and suitable for automotive infotainment systems, OEM amplifier modules, and multi-zone audio processors requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned thermal robustness.

Supply support for TDA7502 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, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing scale and automotive qualification expertise.

The TDA7502 belongs to ST's Orpheus audio DSP product line, engineered specifically for cost-optimized, high-fidelity in-car sound processing with emphasis on real-time equalization, acoustic delay, and multi-channel digital audio routing.

FAQ

What is the maximum supported audio sample rate for the TDA7502 SAI interface?

The TDA7502 supports audio sample rates up to 96 kHz per channel via its SAI interfaces. This is enabled by the 50 MHz DSP clock and configurable SCK/LRCLK dividers, with timing validated for 32–96 kHz operation in the datasheet's SAI section (Figures 4–8). The device maintains stable frame synchronization and data validity across all three SAI receivers and transmitters simultaneously.

Does the TDA7502 require an external crystal, and what are the oscillator specifications?

Yes, the TDA7502 requires an external fundamental-mode crystal connected between XTI and XTO pins. Per datasheet Table 7, it supports 8–12.5 MHz crystals at 3.3 V supply and 125 °C junction temperature. The internal PLL multiplies this to generate the 50 MHz DSP clock (Fvco = 2 × Fdsp), with lock time ≤3 ms and VCO range of 70–140 MHz.

Can the TDA7502 operate without external program memory?

Yes - the TDA7502 contains 512 × 24-bit on-chip Boot ROM and 3072 × 24-bit program RAM, enabling full standalone operation. Firmware is loaded at power-on via the boot ROM sequence, and application code executes from internal RAM. External memory is optional and used only for extended storage or field updates via SPI/I²C.

Is the TDA7502 qualified for automotive use, and what thermal ratings apply?

The TDA7502 is designed for automotive environments with a specified junction temperature range of −40 °C to +125 °C (Table 2) and thermal resistance R_{th j-amb} = 68 °C/W in still air (Table 3). While not formally AEC-Q100 certified in its final revision, its electrical specs, packaging (LQFP44 with thermal pad), and application focus align with Tier-1 automotive amplifier requirements per ST's documentation and historical usage in OEM platforms.