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STMicroelectronics TDA7439DS
- Part No.:
- TDA7439DS
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TDA7439DS.pdf
- Description:
- IC AUDIO TONE PROCESSOR 28SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,349
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Product details
Overview
TDA7439DS from STMicroelectronics is a digitally controlled, three-band audio processor IC for car-radio and Hi-Fi systems. It integrates input multiplexing (four stereo inputs), independent bass/mid/treble control in 2-dB steps, volume control in 1-dB steps, dual speaker attenuators with mute, and I²C serial interface-all implemented using bipolar/CMOS technology to achieve low distortion (0.01% THD), low noise (106 dB S/N), and zero DC stepping.
For engineers reviewing the TDA7439DS datasheet, TDA7439DS pinout, TDA7439DS application, or TDA7439DS equivalent, this device is selected for precision analog signal conditioning in automotive infotainment head units, multi-source AV receivers, and programmable audio front-ends requiring stable gain staging, channel balancing, and tone shaping without mechanical potentiometers.
Technical Context
The TDA7439DS implements a fully analog signal path with digitally programmable resistor-switch networks and operational amplifiers-no DACs or digital audio paths. Tone control is achieved via external RC networks connected to dedicated BASS/MID/TREBLE pins, enabling configurable center frequencies and Q factors for band-pass (bass/mid) and high-pass (treble) filters.
Control is exclusively via standard two-wire I²C interface (address 0x88), supporting auto-incremented sub-address writes for sequential register updates. Power-on reset defaults to IN2 input, 28 dB gain, mute, and flat tone settings-ensuring deterministic startup behavior in embedded audio systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 7–10.2 V - supports direct connection to automotive battery rails with ripple rejection ≥60 dB. |
| THD+N | 0.01% typ. at 1 kHz, 1 V RMS - enables high-fidelity output without audible distortion in line-level processing. |
| Signal-to-Noise Ratio | 106 dB - ensures >16-bit dynamic range for clean audio even at minimum volume settings. |
| Volume Control Range | −47 dB to 0 dB in 1-dB steps - provides fine-grained attenuation resolution to eliminate acoustic zipper noise. |
| Tone Control Resolution | ±14 dB in 2-dB steps for bass/mid/treble - allows precise spectral shaping while minimizing quantization artifacts. |
| I²C Address | 0x88 (7-bit) - fixed hardware address simplifies firmware integration in multi-peripheral bus systems. |
| Input Impedance | 100 kΩ typ. - matches standard consumer/professional line outputs without loading or level loss. |
| Mute Attenuation | 100 dB - achieves true silence during source switching or standby, critical for automotive cabin acoustics. |
Pinout & Package
Package: SO-28 (Small Outline, 28-pin, 300 mil width), RoHS-compliant, tube packaging. Thermal resistance junction-to-pins = 85 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–7, 28 | L/R Input Channels (IN1–IN4) | Four differential-capable stereo input pairs; selectable via I²C; each with programmable 0–30 dB gain. |
| 8, 9 | LOUT / ROUT | Main stereo line outputs; 10–40 Ω output impedance; 2.6 V RMS clipping level into 2 kΩ load. |
| 10, 17 | BOUT(L)/BOUT(R) | Bass-band outputs for external passive crossover or subwoofer drive; buffered, low-impedance. |
| 11, 16 | MOUT(L)/MOUT(R) | Mid-range band outputs; enable bi/tri-amped configurations with external power stages. |
| 12, 14 | TREBLE(L)/TREBLE(R) | Treble-band outputs; high-pass filtered via external capacitor; supports tweeter optimization. |
| 13, 15 | BIN(L)/BIN(R) | Bass-band inputs for feedback loop; used with external RC to set bass center frequency and Q. |
| 18, 19 | MIN(L)/MIN(R) | Mid-band inputs for feedback loop; paired with RM ≈ 25 kΩ internal resistor for mid-frequency tuning. |
| 21, 22 | SCL / SDA | I²C clock/data lines; require external pull-ups; no internal pull-ups - ensures bus compatibility with mixed-voltage systems. |
| 23 | CREF | Reference capacitor pin; 10 µF recommended for stable bias; 4.7 µF allowed for faster power-on settling. |
| 24–27 | VS, AGND, DIG_GND, VREF | Separate analog/digital supplies and grounds - minimizes digital switching noise coupling into audio path. |
Key Features
| Feature | Design Value |
|---|---|
| Four-input stereo multiplexer | Selects among four independent sources (e.g., tuner, Bluetooth, USB, AUX) with per-channel gain calibration up to +30 dB. |
| Independent speaker attenuators | Left/right speaker controls with 76 dB range and 1-dB resolution - enables precise cabin sound staging and driver-side compensation. |
| Three-band parametric tone control | Externally configurable bass/mid/treble center frequencies and Q via RC networks - supports custom EQ curves without DSP. |
| Bipolar/CMOS process | Combines low-noise analog performance (106 dB S/N) with robust digital control - eliminates DC offset drift and step-induced pop noise. |
| Power-on reset consistency | Hardwired POR defaults (IN2, 28 dB gain, mute, flat tone) ensure repeatable startup across temperature and supply variations. |
Applications
| Automotive Head Unit | Multi-Source AV Receiver |
|---|---|
|
Use Scenario: Central audio processor in OEM car radio integrating tuner, CD, Bluetooth, and USB inputs. IC Role / Device Role / Timing Role: Analog signal router, gain-matched preprocessor, and tone shaper before Class AB/D amplifier stage. Use Value: Eliminates manual potentiometers; enables factory calibration of input sensitivity and cabin EQ profiles via I²C. |
Use Scenario: Audio front-end in home theater receiver supporting HDMI ARC, optical, coaxial, and analog inputs. IC Role / Device Role / Timing Role: Source-agnostic analog conditioner that normalizes levels and applies user-selectable tone curves. Use Value: Maintains consistent loudness across sources; prevents clipping on high-output devices (e.g., gaming consoles). |
| Aftermarket Car Stereo | Professional Audio Monitor Controller |
|
Use Scenario: Retrofit audio upgrade module adding digital control to legacy analog head units. IC Role / Device Role / Timing Role: Standalone tone/volume/balance engine interfaced to microcontroller via I²C. Use Value: Enables smartphone app-based EQ tuning and memory presets without redesigning analog signal chain. |
Use Scenario: Reference-grade monitor controller for studio control rooms with multiple speaker sets. IC Role / Device Role / Timing Role: Precision analog attenuator and balance circuit with 100 dB mute isolation. Use Value: Provides click-free level transitions and absolute channel matching (<1 dB tracking error) for critical listening. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7313 | 3-band tone control, but only 4 inputs total (not 4 stereo), no speaker attenuators, lower S/N (95 dB), no CREF pin. | Limited to basic car radios without multi-zone or bi-amp support; lacks independent left/right speaker control. | Choose when cost is primary constraint and speaker-level attenuation is unnecessary. |
| CS4272-CZZ | Audio codec with integrated ADC/DAC, 24-bit resolution, I²S interface - digital architecture, not analog signal processor. | Requires full digital audio path; unsuitable for analog-only designs or legacy amplifier interfaces. | Choose only if migrating to digital audio architecture with DSP-based EQ and sample-rate conversion. |
Compared with TDA7439DS, TDA7313 sacrifices speaker-level control and noise performance for lower BOM cost, while CS4272-CZZ replaces analog signal conditioning with a digital audio subsystem - making TDA7439DS uniquely suited for analog-centric, high-SNR, multi-input automotive and Hi-Fi front-ends.
Availability
TDA7439DS is available at Aetrix Electronics and suitable for automotive infotainment systems, premium home audio receivers, and professional monitor controllers requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for TDA7439DS 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 analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.
The TDA7439DS belongs to ST's automotive-grade audio processor product line, engineered specifically for robust, low-noise analog signal conditioning in vehicle cabins and high-fidelity audio equipment where reliability and EMI immunity are critical.
FAQ
What is the maximum input signal level the TDA7439DS can handle without clipping?
The TDA7439DS supports up to 2 V RMS input signal handling (VCL) at 0.3% THD, verified under standard test conditions (VS = 9 V, RL = 10 kΩ). With maximum input gain (+30 dB), this corresponds to 20 mV RMS at the source - ensuring compatibility with both line-level and low-output phono preamp signals.
Does the TDA7439DS require external passive components for tone control?
Yes - bass and mid-range bands require external RC networks connected between BIN/MIN and BOUT/MOUT pins to define center frequency and Q factor; treble uses an external capacitor to ground on TREBLE pins. The datasheet provides exact formulas and typical values (e.g., 18 nF/22 nF/100 nF) for standard 100 Hz/1 kHz/10 kHz responses.
Can the TDA7439DS operate from a 5 V supply?
No - the absolute maximum supply voltage is 10.5 V, and the specified operating range is 7–10.2 V. Operation below 7 V risks functional failure (e.g., incomplete mute, reduced headroom); it is not rated for 5 V logic or supply domains and lacks 5 V tolerant I²C pins.
How is channel separation maintained between left and right audio paths?
Channel separation exceeds 90 dB at 1 kHz (typ. 100 dB) due to fully isolated analog signal paths, separate AGND routing, and differential-capable input structure. Layout best practices - including split ground planes and symmetric trace routing - preserve this spec in production PCBs.
TDA7439DS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Audio Tone Processor
- Applications:
- Audio
- Number of Channels:
- 2
- Interface:
- I2C
- Voltage - Supply:
- 7V ~ 10.2V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Specifications:
- -
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
TDA7439DS FAQ
1.How can I place an order for TDA7439DS through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7439DS 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 TDA7439DS reliable?
The price and inventory of TDA7439DS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7439DS is usually 5 days.
3.What payment methods are accepted for TDA7439DS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7439DS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7439DS?
TDA7439DS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7439DS 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 TDA7439DS?
For technical support, including TDA7439DS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7439DS requirements.
6.How does Aetrix verify that TDA7439DS is sourced from the original manufacturer or authorized distributors?
All TDA7439DS 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 TDA7439DS meets industry standards.
7.What is the process for return or replacement of TDA7439DS?
All TDA7439DS units undergo pre-shipment inspection (PSI). If there is an issue with TDA7439DS, 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 TDA7439DS part is unused and in its original packaging.
Return procedure for TDA7439DS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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