STMicroelectronics TDA7463A

Overview

TDA7463A from STMicroelectronics is a digitally controlled stereo audio processor IC for low-voltage portable systems, integrating volume, bass, treble, mute, stand-by, and bass automatic level control (ALC) functions-all programmable via I²C serial bus. It operates from 1.8–3 V, delivers ≤0.1% THD at 1 kHz, supports 1 dB volume steps over 63 dB range, and provides ±14 dB bass boost and ±8 dB treble boost.

For engineers reviewing the TDA7463A datasheet, TDA7463A pinout, TDA7463A application, or TDA7463A equivalent, key selection considerations include its I²C-configurable tone processing, ALC threshold programming via external resistor networks, SO20 package compatibility, and dual-input stereo signal path with independent left/right channel control.

Technical Context

The TDA7463A implements analog signal conditioning using bipolar/CMOS technology to achieve low distortion (0.1% THD), low noise (5–8 µV output noise), and DC step-free gain transitions. Its tone control blocks use external RC networks to set center frequencies and Q-factors for bass and treble response curves.

All functional blocks-including volume, bass, treble, mute, and stand-by-are controlled through an I²C interface with dedicated subaddress mapping (e.g., 0x58 for volume, 0x59 for bass). The ALC function uses an internal half-wave rectifier and configurable attack/release timing via external resistors on the ALC pin.

Key Specifications

Pinout & Package

Package: SO20 (Small Outline, 20-pin, 0.65 mm pitch), per mechanical drawing 0016022 D; body dimensions 12.8 × 7.5 mm, max height 2.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CS42L51-CNZR and AK4413VN, the TDA7463A uniquely combines analog dual-input flexibility, programmable ALC, and I²C efficiency in a single low-voltage device-making it optimal for cost-sensitive, battery-powered analog audio front-ends where signal-level adaptation is essential.

Availability

TDA7463A is available at Aetrix Electronics and suitable for portable media players, Bluetooth audio receivers, USB-C audio adapters, and smart home audio hubs requiring stable component supply and long-lifecycle support.

Supply support for TDA7463A 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal products for automotive, industrial, and consumer markets.

The TDA7463A belongs to ST's legacy audio processor product line, engineered specifically for low-power, digitally configurable analog signal conditioning in portable consumer audio equipment.

FAQ

What is the minimum supply voltage required for full functionality of the TDA7463A?

The TDA7463A operates fully across 1.8 V to 3.0 V. At 1.8 V, all features-including volume control, bass/treble boost, ALC, and I²C communication-remain functional per Table 4 and Table 5 test conditions. Below 1.8 V, the internal bias circuitry may fail to stabilize, causing erratic mute behavior or loss of I²C acknowledge.

How is the ALC threshold configured, and what external components are required?

The ALC threshold is set by connecting a resistor between the ALC pin and VS (supply) to define the internal reference current. Four standard thresholds (0.07–0.2 Vrms) are selected via two I²C bits (Table 9); the external resistor (1 kΩ to 100 kΩ) programs attack time and release current per Figure 10 and Table 9. No capacitor is required for basic operation.

Does the TDA7463A support simultaneous use of both stereo inputs (IN1 and IN2)?

No-the TDA7463A supports input selection between IN1-L/R and IN2-L/R via I²C subaddress 0x5B (Table 7), but only one pair is active at a time. The internal analog switch disconnects the inactive input path to prevent crosstalk; simultaneous routing would require external multiplexing before the IC's input pins.

What is the purpose of the CREF pin, and how should it be connected?

CREF is the internal reference capacitor pin for the analog bias generator. It must be connected to a 100 nF ceramic capacitor (C11 in Figure 2) tied to analog ground. Omitting or undersizing this capacitor causes unstable DC operating points, resulting in audible pops during volume changes and increased THD above 0.3%.