STMicroelectronics TDA7718B

Overview

TDA7718B from STMicroelectronics is a 3-band car audio signal processor IC designed for OEM automotive head units. It integrates programmable loudness, volume, bass/middle/treble equalization (2nd-order IIR), subwoofer low-pass filtering, 4-channel speaker attenuation, and DC offset detection - all under digital I²C control. Key confirmed specs include ±15 dB treble gain with 10–17.5 kHz center frequency selection, 55–160 Hz subwoofer cutoff, and TSSOP28 package.

For engineers reviewing the TDA7718B datasheet, TDA7718B pinout, TDA7718B application, or TDA7718B equivalent, this page delivers verified functional architecture, exact pin roles, real-world audio tuning parameters, and validated automotive-grade supply/noise/thermal behavior - not generic signal processing claims.

Technical Context

The TDA7718B implements a fully digital-configurable analog audio signal path: input multiplexing among five stereo sources (QD1, SE1–SE3, FD/QD2), followed by cascaded 2nd-order biquad filters for loudness, bass, middle, treble, and subwoofer processing. All filter coefficients are loaded via I²C, enabling runtime reconfiguration without hardware change.

Its analog front-end supports quasi-differential (100 kΩ input impedance, −3 dB gain) and full-differential inputs, while output stages drive 2 kΩ loads with 2 VRMS clipping level and A-weighted noise of 12 µV typical. DC offset detection uses internal comparators with programmable spike rejection (2–30 µs) and charge/discharge current control.

Key Specifications

Pinout & Package

Package: TSSOP28 (3.6 mm × 9.7 mm, 0.65 mm pitch), thermally enhanced for automotive ambient range (−40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar car audio processor applications.

Compared with TDA7718B, TDA7719 offers higher fidelity and feature depth at the cost of firmware migration effort, while STA559BW trades diagnostic capability for integration density - making TDA7718B optimal for reliability-critical, amplifier-agnostic automotive audio systems.

Availability

TDA7718B is available at Aetrix Electronics and suitable for automotive head units, OEM infotainment systems, and aftermarket car stereos requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TDA7718B 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 ISO/TS 16949-certified manufacturing.

The TDA7718B belongs to ST's TDA7xxx automotive audio processor family, engineered specifically for cost-effective, high-SNR signal conditioning in resource-constrained vehicle head units - prioritizing robustness over multimedia versatility.

FAQ

What is the maximum input voltage rating for TDA7718B analog inputs?

The absolute maximum input voltage on all analog input pins (SE1L–SE3R, QD1L/QD1R, FD1L±/FD1R±) is 7 V, as specified in Table 4 of the datasheet. Exceeding this risks permanent damage to the internal ESD protection diodes and input transistors. Input signals must be clamped or attenuated externally if sourced from unregulated automotive sensors or legacy head unit outputs.

Does TDA7718B support I²C clock stretching?

No, the TDA7718B does not support I²C clock stretching. Its I²C interface operates strictly as a slave device with fixed timing compliance per standard-mode specifications (100 kHz max, tBUF = 5 µs, tLOW = 4.7 µs). Host controllers must ensure data setup/hold times without relying on slave-driven clock hold - verified in Section 5.1 and Figure 20 of the datasheet.

How is the DC offset detection threshold configured?

The DC offset detection window thresholds (V1–V4) are fixed internal comparator levels (±10 mV to ±130 mV) and cannot be programmed. The device reports fault status via the DC_ERR pin; WinTC provides a filtered version of the input for external validation. Configuration is limited to enabling/disabling detection via I²C register 6, bit D0 (DCDET_EN).

Can TDA7718B drive headphones directly?

No, TDA7718B is not designed for direct headphone driving. Its outputs (OUTLF, OUTRF, etc.) are line-level (2 VRMS clipping, 20–100 Ω output impedance) intended for connection to external power amplifiers or ADC inputs. Driving 16–32 Ω headphones would cause severe distortion and exceed safe output current limits per electrical characteristics in Table 5.