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STMicroelectronics TDA7464
- Part No.:
- TDA7464
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 44-LQFP
- Datasheet:
-
TDA7464.pdf
- Description:
- IC AUDIO TONE PROCESSOR 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,328
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Product details
Overview
TDA7464 from STMicroelectronics is a digitally controlled audio processor IC with integrated SRS Surround Sound and voice canceller, supporting 4 stereo inputs, independent speaker/recording attenuators (0.5 dB/1 dB steps), treble/middle/bass control (±14 dB), and zero-crossing mute. It serves as the central audio signal conditioning and spatial enhancement engine in automotive head units and premium TV audio subsystems.
For engineers reviewing the TDA7464 datasheet, TDA7464 pinout, TDA7464 application, or TDA7464 equivalent, key selection concerns include I²C-programmable surround mode selection (Music/Movie/Simulated), SRS center/space attenuation resolution (1 dB), voice canceller output gain (6 dB typ.), and thermal resistance (85 °C/W) for automotive ambient operation up to +85 °C.
Technical Context
The TDA7464 implements analog signal processing using bipolar/CMOS technology, combining resistor-network-based tone control with external phase-shifter networks (PS1–PS4) and matrix mixing to generate SRS-derived surround effects. Its architecture separates input attenuation, tone shaping, SRS processing, and output attenuation into independently programmable stages via I²C.
Surround sound generation relies on four selectable phase shifter configurations (RPS10–RPS43) and three standard modes-Music (7 dB in-phase gain), Movie (8 dB), and Simulated (variable response)-with effect control adjustable from –21 dB to –6 dB in 1 dB steps. Voice cancellation operates in three fixed configurations (AVO1–AVO3) with 6 dB typical output gain when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 7–10.2 V - supports 9 V nominal automotive rail with ±1.2 V tolerance |
| Input Attenuation Range | –31.5 to 0 dB in 0.5 dB steps - enables precise headroom management across 4 stereo inputs |
| Tone Control Range | ±14 dB (treble/middle/bass) in 2 dB steps - matches human auditory sensitivity for perceptually linear adjustment |
| Speaker Attenuation | 0 to –79 dB in 1 dB steps with zero-crossing switching - eliminates pop/click during volume transitions |
| SRS Center/Space Control | –31 to 0 dB in 1 dB steps - directly adjusts perceived soundstage width and front-center focus |
| THD+N | 0.01% typ. at 1 Vrms - ensures low-distortion playback in Hi-Fi-grade car audio systems |
| Channel Separation | 90 dB at 1 kHz - maintains discrete left/right imaging critical for surround decoding fidelity |
| Thermal Resistance | 85 °C/W (junction-to-pins) - defines heatsinking requirement for continuous 25 mA supply current at +85 °C ambient |
Pinout & Package
TDA7464 uses a 44-pin TQFP (10 mm × 10 mm, 0.8 mm pitch) package with exposed thermal pad. Pin numbering follows standard counter-clockwise layout starting from top-left corner (Pin 1 = VAR_L).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VAR_L / VAR_R | Left/Right input variable attenuator control | Analog voltage reference for input stage attenuation; sets DC bias point for 30 kΩ input impedance |
| SCL / SDA | I²C serial bus clock/data lines | Standard 2-wire interface for configuration; requires external 4.7 kΩ pull-ups to VS |
| L_OUT / R_OUT | Main speaker outputs | DC-coupled, 30 Ω output impedance; supports direct connection to 4–8 Ω loads with mute attenuation ≥70 dB |
| RECOUT_L / RECOUT_R | Record path outputs | Independent buffered outputs with 1 dB step attenuators; selectable via multiplexer for post-processing monitoring |
| PS1–PS4 | Phase shifter resistor terminals | Four external resistor nodes defining surround matrix coefficients; values range 4.2–48.9 kΩ per phase stage |
| CREF | Capacitor reference for internal bias network | Connects to 100 nF capacitor to stabilize internal op-amp common-mode voltage |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel stereo input routing | Selectable via I²C-controlled multiplexer (IN_1 to IN_4); supports source-switching without signal interruption |
| SRS Surround Sound engine | License-certified implementation with center/space controls; delivers perceptual 3D imaging without rear speakers |
| Voice canceller with 3 operating modes | Configurable via register bits; provides 6 dB typical output gain for dual-mic echo suppression in hands-free systems |
| Zero-crossing speaker attenuation | Hardware-synchronized mute/attenuation switching eliminates audible transients during real-time volume changes |
| Independent record path processing | Dedicated attenuators and mux for RECOUT_L/R enable simultaneous monitoring of processed vs. raw signals |
| Bipolar/CMOS process technology | Enables <0.1% THD+N and >106 dB SNR while maintaining DC step error <±3 mV between adjacent attenuation steps |
Applications
| Automotive Head Unit Audio Processing | Premium TV Audio Enhancement |
|---|---|
Use Scenario: Integrated into OEM car radio platforms requiring multi-source (USB, Bluetooth, tuner) audio conditioning before amplifier stage. IC Role / Device Role / Timing Role: Central audio processor handling input selection, tone correction, SRS surround rendering, and speaker-level attenuation. Use Value: Enables single-chip replacement of discrete op-amp/tone-stack designs while adding license-compliant SRS and voice cancellation for hands-free calling. | Use Scenario: Used in high-end smart TVs to enhance stereo content with virtual surround and bass extension without external DSP. IC Role / Device Role / Timing Role: Real-time analog-domain audio processor applying configurable EQ, balance, and SRS spatialization prior to DAC conversion. Use Value: Delivers theater-like immersion from 2-channel sources using only passive external components (resistors, caps) and no firmware development. |
| Hi-Fi Stereo Receiver Signal Path | Professional Audio Monitor Controller |
Use Scenario: Embedded in compact stereo receivers where space constraints prohibit multi-IC audio chains. IC Role / Device Role / Timing Role: Analog signal conditioner managing input attenuation, 3-band EQ, balance, and speaker output drive with mute sequencing. Use Value: Reduces BOM count by integrating 4-input mux, tone stack, and dual-output attenuators - all programmable over I²C with no external microcontroller required. | Use Scenario: Deployed in broadcast studio monitor controllers needing clean, switchable audio paths with precise level matching. IC Role / Device Role / Timing Role: Dual-path analog processor providing independent attenuation (speaker + record), zero-crossing mute, and channel separation >90 dB. Use Value: Ensures glitch-free level adjustments and isolated record feeds for live mix-down verification without interrupting main output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7492 | Class-D stereo amplifier with integrated digital audio processor; lacks SRS licensing and voice canceller | Targeted at self-contained amplified speaker systems; not suitable for line-level signal conditioning | Choose when power amplification is needed alongside basic EQ, but SRS and voice cancellation are unnecessary |
| CS4361-CZZ | 24-bit stereo DAC with minimal analog post-processing; no tone control, surround, or input attenuation | Designed for digital audio playback only; requires external op-amps for analog signal chain functions | Choose only if full digital signal path is preferred and all tone/surround processing occurs upstream in FPGA or SoC |
Compared with TDA7464, TDA7492 integrates power amplification but sacrifices SRS and voice cancellation, while CS4361-CZZ offers higher-resolution DAC performance but no analog processing capability - making TDA7464 uniquely suited for license-compliant, analog-domain surround enhancement in resource-constrained embedded audio systems.
Availability
TDA7464 is available at Aetrix Electronics and suitable for automotive infotainment, premium TV audio subsystems, and Hi-Fi receiver designs requiring stable component supply and long-lifecycle support.
Supply support for TDA7464 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 analog, power, and microcontroller solutions for automotive, industrial, and consumer markets.
The TDA7464 belongs to ST's legacy audio processor product line, designed specifically for cost-sensitive, high-fidelity analog audio signal conditioning in automotive and home entertainment systems with minimal external component count.
FAQ
What is the function of the PS1–PS4 pins on the TDA7464?
The PS1–PS4 pins connect to external resistors that configure the phase-shift network used in the standard surround sound matrix. Each pin corresponds to one of four phase shifter stages (RPS10–RPS43), with resistor values ranging from 4.2 kΩ to 48.9 kΩ determining the frequency-dependent phase delay applied to generate surround cues. These resistors must be selected per the datasheet tables to achieve Music, Movie, or Simulated modes.
Does the TDA7464 require an external microcontroller to operate?
Yes - the TDA7464 is configured exclusively via its I²C interface (SCL/SDA pins). An external microcontroller or system host must send initialization sequences and real-time control commands to set input attenuation, tone levels, surround mode, SRS parameters, and mute states. No standalone operation or internal firmware is present.
Can the voice canceller be used independently of the SRS surround function?
Yes - the voice canceller and SRS surround are fully independent features. The voice canceller is enabled/disabled via dedicated I²C register bits (D7/D6 in voice canceller subaddress), and its three operating modes (AVO1–AVO3) function regardless of SRS ON/OFF state. SRS bypass mode requires –3 dB input attenuation but does not disable voice cancellation.
What is the purpose of the CREF pin and how should it be connected?
The CREF pin connects to a 100 nF capacitor to ground to stabilize the internal bias network for operational amplifiers. This capacitor establishes the reference voltage for tone control and attenuation circuitry, ensuring consistent DC operating points across temperature and supply variations. Omitting or undersizing this capacitor causes gain drift and increased distortion.
TDA7464 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 44-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Audio Tone Processor
- Applications:
- Signal Mixing
- Number of Channels:
- 2
- Interface:
- I2C
- Voltage - Supply:
- 7V ~ 10.2V
- Operating Temperature:
- -10°C ~ 85°C (TA)
- Specifications:
- Audio Matrix
- Mounting Type:
- Surface Mount
- Grade:
- -
TDA7464 FAQ
1.How can I place an order for TDA7464 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7464 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 TDA7464 reliable?
The price and inventory of TDA7464 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7464 is usually 5 days.
3.What payment methods are accepted for TDA7464?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7464 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7464?
TDA7464 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7464 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 TDA7464?
For technical support, including TDA7464 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7464 requirements.
6.How does Aetrix verify that TDA7464 is sourced from the original manufacturer or authorized distributors?
All TDA7464 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 TDA7464 meets industry standards.
7.What is the process for return or replacement of TDA7464?
All TDA7464 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7464, 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 TDA7464 part is unused and in its original packaging.
Return procedure for TDA7464:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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