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STMicroelectronics TDA7406
- Part No.:
- TDA7406
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 44-LQFP
- Datasheet:
-
TDA7406.pdf
- Description:
- IC AUDIO SIGNAL PROCESSOR 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,924
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Product details
Overview
TDA7406 from STMicroelectronics is a fully integrated car radio signal processor IC combining a 7-band audio equalizer, 7-band spectrum analyzer, stereo decoder, AM/FM noiseblanker, and multipath detector in a single TQFP44 package. It delivers programmable loudness compensation, soft-step volume/speaker control, subwoofer high-pass filtering (90/135/180 Hz), RDS mute, and I²C-controlled digital configuration for automotive infotainment systems.
For engineers reviewing the TDA7406 datasheet, TDA7406 pinout, TDA7406 application, or TDA7406 equivalent, this device serves as a complete analog front-end solution for modern car radios-supporting 4 stereo inputs, 4 mono inputs, 4 independent speaker outputs, subwoofer output, and real-time spectrum visualization without external passive components or manual adjustments.
Technical Context
The TDA7406 integrates three functionally distinct subsystems on-die: an audioprocessor with switch-capacitor 2nd-order filters for equalization and spectrum analysis, a stereo decoder with PLL-based pilot tone detection and stereoblend control, and a dual-mode (AM/FM) noiseblanker with programmable trigger paths including multipath-level and over-deviation detection. All subsystems share a common I²C interface for synchronized register programming.
Its analog signal chain features pseudo-differential CDC stereo inputs, AutoZero offset cancellation, programmable input gain (0–15 dB), and soft-step attenuation with blend-time control. The spectrum analyzer provides seven parallel bandpass outputs driven by an external SACLK, while the subwoofer path includes a selectable 2nd-order Butterworth high-pass filter with three cutoff frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 7.5–10 V - Operates across automotive battery range including cold-crank transients up to 10.5 V absolute max. |
| Supply Current | 42–78 mA @ 9 V - Enables low-power operation in always-on head unit architectures. |
| Equalizer Bands | 7-band, ±15 dB range, 1 dB steps - Supports precise tonal shaping across full audio spectrum (62 Hz to 16 kHz). |
| Spectrum Analyzer | 7-band, 2nd-order SC filters, analog outputs - Delivers real-time frequency-domain visualization without ADC or DSP overhead. |
| Noiseblanker Trigger | Multi-source: multipath level, over-deviation, stereoblend voltage - Reduces impulse noise in weak-signal urban driving conditions. |
| I²C Interface | Standard-mode (100 kHz), auto-increment addressing - Allows compact firmware register mapping for full system configuration. |
| Operating Temp | −40 °C to +85 °C - Qualified for under-dash automotive environments with no derating required. |
Pinout & Package
TQFP44 (7 × 7 mm, 0.8 mm pitch) with exposed thermal pad; RoHS-compliant, lead-free finish. Pin 1 marked by dot; top-side view per Figure 2 of ST datasheet (Rev 1, Sept 2006).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS | Power Supply Input | Main analog supply (7.5–10 V); decoupling required at pin for noise immunity. |
| GND | Analog Ground Reference | Common return for all analog signal paths; separate from digital ground in layout. |
| SDA / SCL | I²C Data/Clock | Bi-directional serial interface for register read/write; pull-up resistors required externally. |
| ACINL / ACINR | Front Left/Right Analog Inputs | Single-ended stereo inputs supporting line-level signals up to 2 VPP. |
| MIXINLF / MIXINRF | Front Left/Right Mix Inputs | Dedicated inputs for phone/navi/tuner signals; mixed into speaker outputs under software control. |
| SWACOUT | Subwoofer High-Pass Output | Monaural output with programmable 90/135/180 Hz 2nd-order Butterworth high-pass filter. |
| SAOUT | Spectrum Analyzer Output | Analog output of 7-band bandpass filter bank; requires external SACLK for timing. |
| PAUSE | Pause Detector Output | Open-drain digital flag indicating MPX pause condition; used for display or muting logic. |
| QUAL | Quality Detector Output | Analog voltage proportional to received signal quality; enables dynamic audio processing adaptation. |
Key Features
| Feature | Design Value |
|---|---|
| 7-Band Equalizer with DC Mode | Enables bass boost down to 62 Hz and supports DC-coupled applications via configurable low-frequency band behavior. |
| Integrated Stereo Decoder + Noiseblanker | Eliminates need for discrete decoder IC and external noise suppression circuitry; reduces BOM count by ≥3 components. |
| Soft-Step Speaker Control | Prevents audible click/pop during volume or fader transitions using controlled ramp timing (programmable blend time). |
| RDS Mute & AM/FM Multipath Detection | Automatically mutes audio during RDS data bursts and adapts processing based on real-time multipath severity. |
| Internal Beep Generator | Four fixed-frequency tones (e.g., 440 Hz, 880 Hz) generated on-chip; eliminates external oscillator or MCU tone generation. |
Applications
| FM/AM Car Radio Head Unit | Aftermarket Infotainment System |
|---|---|
Use Scenario: Integrated audio processing for OEM or aftermarket car radios receiving analog FM/AM tuner outputs and auxiliary sources. IC Role / Device Role / Timing Role: Central audio signal processor handling input mixing, equalization, stereo decoding, noise suppression, and speaker/subwoofer routing. Use Value: Replaces discrete op-amps, filters, and decoder ICs; enables feature-rich UI with real-time spectrum display and adaptive loudness. |
Use Scenario: Compact infotainment platform supporting Bluetooth audio, USB playback, and navigation audio mixing. IC Role / Device Role / Timing Role: Audio hub managing simultaneous inputs (phone call, music, voice prompt) with priority-based muting and cross-fading. Use Value: Soft-step fader/volume control prevents audio artifacts during source switching; internal beep generator simplifies UI feedback design. |
| Automotive Subwoofer Management | Diagnostic Audio Signal Analyzer |
Use Scenario: Dedicated subwoofer channel with high-pass filtering and independent level control in multi-zone audio systems. IC Role / Device Role / Timing Role: Subwoofer signal conditioner providing programmable 90/135/180 Hz high-pass and 95 dB soft-step attenuation. Use Value: Eliminates external passive crossover networks; allows firmware-tuned bass response matching vehicle acoustics. |
Use Scenario: In-vehicle diagnostic tool visualizing RF reception quality and audio spectral content during service mode. IC Role / Device Role / Timing Role: Real-time spectrum analyzer engine feeding analog band outputs to microcontroller ADC for display rendering. Use Value: Seven-band SC filter bank provides stable, temperature-invariant frequency binning without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar car radio signal processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7413 | Successor IC with enhanced noiseblanker, wider supply range (5.5–12 V), and improved ESD rating (±8 kV HBM). | Supports newer tuner IF architectures and higher-voltage automotive platforms; lacks RDS mute functionality. | Select when upgrading legacy designs requiring extended voltage tolerance and robust noise immunity. |
| STA559BW | Digital audio processor with integrated Class-D amplifier; no analog spectrum analyzer or stereo decoder. | Focused on amplified output stages rather than baseband signal conditioning; requires external decoder for FM/AM. | Select when system-level integration of amplification and DSP is prioritized over analog front-end completeness. |
Compared with TDA7406, TDA7413 offers higher supply flexibility and stronger ESD protection but removes RDS mute-critical for European market radios-while STA559BW trades analog signal integrity for power efficiency and digital configurability, necessitating additional external ICs for full radio functionality.
Availability
TDA7406 is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket head units, and diagnostic audio analyzers requiring stable component supply and long-lifecycle support.
Supply support for TDA7406 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 analog and mixed-signal portfolio coverage.
The TDA7406 belongs to ST's legacy automotive audio processor family, designed specifically to consolidate analog signal conditioning, stereo decoding, and noise mitigation functions into a single chip for cost-sensitive car radio platforms.
FAQ
Is the TDA7406 still in production?
No-the TDA7406 is marked "Obsolete Product(s)" in ST's official documentation (Rev 1, September 2006). It remains available through authorized distributors and Aetrix Electronics' legacy component program with verified date-code stock and full traceability, intended for maintenance, repair, and legacy design continuity-not new product introductions.
What is the function of the SAOUT pin?
The SAOUT pin delivers seven analog bandpass outputs corresponding to the internal spectrum analyzer's 2nd-order switch-capacitor filters (centered at 62 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.3 kHz, and 16 kHz). Each output requires an external SACLK signal to synchronize sampling; no internal clock generator is provided.
Can the TDA7406 decode RDS data?
No-the TDA7406 supports RDS mute (automatically silencing audio during RDS data bursts) but does not include an RDS data demodulator or parser. RDS bitstream extraction requires an external RDS decoder IC or MCU-based software-defined radio implementation interfacing with the TDA7406's MPX output.
Does the TDA7406 require external passive components for equalization?
No-all 7-band equalizer filters are implemented with on-chip switch-capacitor topology; no external capacitors or inductors are needed for EQ functionality. Only standard power supply decoupling (100 nF ceramic + 10 µF tantalum) and I²C pull-ups are required for basic operation.
TDA7406 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 44-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Audio Signal Processor
- Applications:
- Audio
- Number of Channels:
- 2
- Interface:
- I2C
- Voltage - Supply:
- 7.5V ~ 10V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Specifications:
- -
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
TDA7406 FAQ
1.How can I place an order for TDA7406 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7406 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TDA7406 reliable?
The price and inventory of TDA7406 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7406 is usually 5 days.
3.What payment methods are accepted for TDA7406?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7406 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7406?
TDA7406 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7406 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TDA7406?
For technical support, including TDA7406 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7406 requirements.
6.How does Aetrix verify that TDA7406 is sourced from the original manufacturer or authorized distributors?
All TDA7406 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TDA7406 meets industry standards.
7.What is the process for return or replacement of TDA7406?
All TDA7406 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7406, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TDA7406 part is unused and in its original packaging.
Return procedure for TDA7406:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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