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STMicroelectronics TDA7418
- Part No.:
- TDA7418
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TDA7418.pdf
- Description:
- IC AUDIO SIGNAL PROCESSOR 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,487
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Product details
Overview
TDA7418 from STMicroelectronics is a 3-band car audio processor IC with integrated bass/middle/treble filters, loudness compensation, and programmable soft-step volume control. It supports four stereo input sources (including pseudo-differential), provides independent speaker/subwoofer attenuation (±15 dB, 1 dB steps), and operates from 8–10 V supply across –40 °C to +85 °C in automotive infotainment systems.
For engineers reviewing the TDA7418 datasheet, TDA7418 pinout, TDA7418 application, or TDA7418 equivalent, key selection considerations include its I²C-programmable 2nd-order filter center frequencies (e.g., bass at 60/80/100/200 Hz), AutoZero offset cancellation, SoftMute timing options (0.48/0.96/123 ms), and SO20 package compatibility with board-level audio signal conditioning.
Technical Context
The TDA7418 implements fully digital I²C-controlled analog signal processing: its input multiplexer selects among SE1–SE3 stereo inputs or PD/SE4 pseudo-differential input, each with 0–15 dB programmable gain and AutoZero offset cancellation triggered on source change. The loudness stage applies second-order frequency response with selectable center frequencies (400/800/2400 Hz) and flat-mode attenuation.
Bass, middle, and treble sections each use independently configurable 2nd-order filters: bass offers Q = 1.0/1.25/1.5/2.0 and DC-gain mode; middle provides Q = 0.5/0.75/1.0/1.25; treble supports center frequencies up to 17.5 kHz. All output stages (front/rear/subwoofer/speaker) feature soft-step attenuation from +15 dB to –79 dB with 1 dB resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 8–10 V - compatible with automotive battery rails; 8.5 V typical for full performance |
| Operating Temperature | –40 °C to +85 °C - qualified for under-dash automotive environments |
| Input Gain Range | 0–15 dB in 1 dB steps - enables level matching across diverse head-unit or tuner sources |
| Loudness Center Frequencies | 400 / 800 / 2400 Hz - targets perceived loudness compensation at low/mid frequencies per ISO 226 |
| Bass Filter Q Options | 1.0 / 1.25 / 1.5 / 2.0 - adjusts bandwidth selectivity for tight vs. extended low-end response |
| SoftMute Times | 0.48 / 0.96 / 123 ms - prevents pop/click during muting; fast modes for transient suppression, slow for fade-out |
| Output Noise | 12–20 µV (20 Hz–20 kHz) - ensures >100 dB SNR at 2 VRMS output, critical for high-fidelity cabin audio |
Pinout & Package
Package: SO20 (Small Outline, 20-pin, 0.6 mm pitch), surface-mount, RoHS-compliant, tube or tape-and-reel packaging per order code TDA7418/TDA7418TR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SE1L/SE1R–SE3L/SE3R | Stereo single-ended inputs | Three independent stereo input channels; each pair accepts line-level signals up to 2 VRMS |
| DIFFL/DIFFG/DIFFR | Pseudo-differential stereo input | High-CMRR (60 dB @ 1 kHz) input stage; configurable as single-ended via register control |
| OUTLF/OUTRF/OUTLR/OUTRR | Front/rear speaker outputs | Four buffered analog outputs; each supports independent soft-step attenuation (+15 to –79 dB) |
| OUTSW | Subwoofer mono output | Dedicated low-frequency path with separate gain control and mute capability |
| MUTE/MUXOUT | External mute input / MUX status output | Hardware mute activation or I²C-confirmed multiplexer state reporting |
| SCL/SDA | I²C bus interface | Standard two-wire serial control; supports multi-device addressing in head-unit audio subsystems |
| VDD/GND/CREF | Power, ground, reference capacitor | CREF sets internal bias; requires 100 nF ceramic capacitor for stable AutoZero operation |
Key Features
| Feature | Design Value |
|---|---|
| AutoZero offset cancellation | Reduces input-stage DC offset to ≤0.5 mV without external nulling components; aligns in ≤0.6 ms on source change |
| Programmable loudness boost | Second-order response with selectable center frequency (400/800/2400 Hz) and ±15 dB range - matches human ear sensitivity curves at low volumes |
| Independent speaker faders | Four soft-step attenuators (front left/right, rear left/right) with synchronized 1 dB steps - enables precise cabin sound staging |
| I²C-configurable filter Q | Bass Q = 1.0–2.0 and middle Q = 0.5–1.25 allow tuning of resonance sharpness for different speaker enclosures and vehicle acoustics |
| SoftStep volume blending | Eight programmable blend times prevent audible clicks during volume transitions - essential for seamless UI interaction in automotive HMI |
Applications
| Automotive Head Unit Audio Processing | Aftermarket DSP Integration |
|---|---|
Use Scenario: OEM or aftermarket car stereo head unit performing real-time tone shaping and source switching. IC Role / Device Role / Timing Role: Central audio processor handling input multiplexing, loudness compensation, and 3-band EQ before DAC or amplifier stages. Use Value: Enables consistent perceived volume across sources and listening levels using programmable 400/800/2400 Hz loudness curves and AutoZero-corrected inputs. | Use Scenario: Compact add-on digital signal processor module enhancing factory audio systems. IC Role / Device Role / Timing Role: Standalone analog-domain tone controller interfacing between head unit line-out and external amplifiers. Use Value: Provides independent front/rear/subwoofer fader control (+15 to –79 dB, 1 dB steps) without requiring full digital DSP hardware. |
| Multi-Zone Cabin Audio Distribution | Low-Cost Infotainment Signal Conditioning |
Use Scenario: Vehicle with driver-focused and passenger-zone audio routing and independent EQ. IC Role / Device Role / Timing Role: Input selector and channel-specific attenuator enabling zone-based volume and tone control. Use Value: Four soft-step speaker outputs and dedicated subwoofer path support discrete zone signal paths with click-free level transitions. | Use Scenario: Entry-level connected infotainment system requiring analog audio enhancement without FPGA or DSP core. IC Role / Device Role / Timing Role: Integrated analog audio conditioner replacing discrete op-amp filter networks and manual potentiometers. Use Value: Reduces BOM count by integrating 3-band EQ, loudness, mute, and soft-step functions into single SO20 IC with I²C configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-band automotive audio processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7419 | Includes integrated 6-channel preamplifier and higher SNR (105 dB); same SO20 package and I²C interface | Targets premium head units requiring additional input buffering and lower noise floor | Select when preamp gain staging and <15 µV noise are required; pin-compatible upgrade path |
| CS42L52-CNZ | Low-power stereo codec with integrated 3-band EQ; 3.3 V operation, QFN-32 package, no AutoZero | Designed for portable/navigation devices; lacks loudness compensation and subwoofer output | Choose for battery-powered applications where 8–10 V supply and dedicated subwoofer path are not needed |
Compared with TDA7418, TDA7419 offers enhanced SNR and preamp integration for higher-fidelity systems, while CS42L52-CNZ trades automotive voltage tolerance and loudness features for compact size and low power-making TDA7418 optimal for cost-sensitive, 12 V-based car audio signal conditioning.
Availability
TDA7418 is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket DSP modules, multi-zone cabin audio distribution, and low-cost infotainment signal conditioning requiring stable component supply and long-lifecycle support.
Supply support for TDA7418 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 specializing in automotive, industrial, and power management ICs, with broad analog and mixed-signal product portfolios.
The TDA7418 belongs to ST's car audio processor family, designed specifically for analog-domain tone control, loudness compensation, and source switching in 12 V automotive head units and aftermarket audio systems.
FAQ
What is the purpose of the CREF pin on the TDA7418?
The CREF pin connects a 100 nF ceramic capacitor to ground to stabilize the internal reference voltage used by the AutoZero circuitry. This capacitor ensures accurate DC offset cancellation across temperature and supply variations; omitting it degrades AutoZero performance and may cause audible pops during input switching.
Does the TDA7418 support true differential input operation?
No-the TDA7418 provides a pseudo-differential input (PD/SE4) with separate DIFFL, DIFFG, and DIFFR pins, but it does not implement a fully differential amplifier topology. Its CMRR is 60 dB at 1 kHz, confirming single-ended signal processing with common-mode rejection, not balanced line reception.
Can the loudness function be disabled to use only flat attenuation?
Yes-the loudness stage includes a selectable flat-mode that operates as a constant 0 to –15 dB attenuator without frequency-dependent boost. This is configured via I²C register bit settings and is useful when loudness compensation is undesired but programmable attenuation is still needed.
How does the SoftStep volume control prevent audio clicks?
SoftStep uses an internal S-shaped envelope generator to ramp gain changes over programmable time intervals (eight options from ~1 ms to ~100 ms), eliminating abrupt DC transients and signal envelope discontinuities. It operates independently per channel and is synchronized across all outputs to maintain inter-channel phase coherence.
TDA7418 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Audio Signal Processor
- Applications:
- Audio
- Number of Channels:
- 4
- Interface:
- I2C
- Voltage - Supply:
- 8V ~ 10V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Specifications:
- -
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
TDA7418 FAQ
1.How can I place an order for TDA7418 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7418 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 TDA7418 reliable?
The price and inventory of TDA7418 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7418 is usually 5 days.
3.What payment methods are accepted for TDA7418?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7418 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7418?
TDA7418 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7418 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 TDA7418?
For technical support, including TDA7418 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7418 requirements.
6.How does Aetrix verify that TDA7418 is sourced from the original manufacturer or authorized distributors?
All TDA7418 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 TDA7418 meets industry standards.
7.What is the process for return or replacement of TDA7418?
All TDA7418 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7418, 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 TDA7418 part is unused and in its original packaging.
Return procedure for TDA7418:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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