STMicroelectronics TDA7460NDTR

Overview

TDA7460NDTR from STMicroelectronics is a fully integrated car radio signal processor combining stereo FM/AM decoding, audio processing (loudness, bass/treble, volume, speaker control), noise blanking, and multipath detection in a single SO20 package. It operates from 7.5–10 V supply, draws 25–35 mA, supports I²C programmability, and delivers ≤15 mV output noise (20 Hz–20 kHz) with ≥80 dB input separation - enabling compact, high-fidelity automotive head units without external passive components.

For engineers reviewing the TDA7460NDTR datasheet, TDA7460NDTR pinout, TDA7460NDTR application, or TDA7460NDTR equivalent, this device serves as a legacy-grade, production-supported solution for cost-sensitive, space-constrained car audio systems requiring integrated analog signal conditioning, stereo demodulation, and real-time interference mitigation - particularly where I²C configurability and switched-capacitor architecture eliminate tuning components.

Technical Context

The TDA7460NDTR integrates three functional domains on a single BICMOS die: an audio processor with programmable 2nd-order bass/treble filters (center frequencies 54–110 Hz / 17.5 kHz), soft-step volume control (1 dB steps, −79 dB to +20 dB), and loudness compensation (400 Hz center, 15×1 dB attenuation); and a stereo decoder with PLL-based pilot tone detection, de-emphasis, field-strength control, and stereo blend adjustment.

Its noise blanker uses dual-trigger paths (peak voltage and over-deviation detection) with automatic threshold control (ATC), while the multipath detector provides real-time RF path distortion monitoring via dedicated analog output. All signal paths are fully differential or quasi-differential, with CMRR ≥45 dB at 1 kHz and input resistance ≥70 kΩ across CD/cassette inputs.

Key Specifications

Pinout & Package

Package: SO20 (Small Outline, 20-pin, 0.65 mm pitch), RoHS-compliant, surface-mountable with thermal resistance R_{th-j pins} = 85 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar car radio signal processing applications.

Compared with STA559BW and TDA7313, the TDA7460NDTR uniquely combines full FM/AM stereo decoding, noise immunity circuitry, and multipath monitoring in one SO20 package - making it the only option for self-contained, tuner-integrated car radios needing analog-domain interference suppression without added ICs.

Availability

TDA7460NDTR is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket radio receivers, and mobile media hubs requiring stable component supply amid long product lifecycles and legacy platform support.

Supply support for TDA7460NDTR 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, power management, and analog/mixed-signal ICs with broad manufacturing scale and AEC-Q100 qualification expertise.

The TDA7460NDTR belongs to ST's legacy automotive audio processor family, designed specifically for cost-optimized, high-reliability car radio systems requiring integrated analog signal conditioning, stereo decoding, and real-time RF interference mitigation - before the industry shifted to digital-tuner-plus-DSP architectures.

FAQ

Is the TDA7460NDTR still in production despite being marked "Not for New Design"?

Yes. STMicroelectronics continues manufacturing the TDA7460NDTR under active product status per official documentation (Rev 4, March 2009). It remains available through authorized distributors and Aetrix Electronics for legacy program support, repair, and maintenance - though ST recommends newer alternatives like the STA559 series for greenfield designs.

What is the function of the CREF pin, and what capacitor value is required?

The CREF pin connects to an external 100 nF ceramic capacitor (±10%) that sets the master clock frequency for all internal switched-capacitor filters. This single capacitor determines bass/treble cutoffs, loudness center frequency, and noise blanker timing - eliminating need for individual RC networks and ensuring temperature-stable filter characteristics across −40°C to +85°C.

Does the TDA7460NDTR support true differential inputs for CD and cassette sources?

Yes. Pins CASSL/CASSR and CDL/CDR accept fully differential signals with 70–130 kΩ input resistance and ≥45 dB common-mode rejection at 1 kHz. The internal AutoZero circuit actively cancels DC offsets, enabling direct coupling from transformer-isolated or op-amp-driven sources without blocking capacitors.

How does the multipath detector output interface with a microcontroller?

The multipath detector drives an analog voltage (0–VS) on the LEVEL pin proportional to multipath severity - higher voltage indicates stronger distortion. This signal can be read by any MCU ADC with ≥8-bit resolution; ST application notes specify threshold voltages (e.g., >3.5 V = severe multipath) to trigger antenna diversity or display alerts without additional signal conditioning.