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STMicroelectronics TDA7718BTR
- Part No.:
- TDA7718BTR
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TDA7718BTR.pdf
- Description:
- IC AUDIO SIGNAL PROCESSR 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,423
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Product details
Overview
TDA7718BTR from STMicroelectronics is a 3-band car audio signal processor IC designed for front/rear/subwoofer channel management in automotive head units. It integrates programmable loudness, bass/middle/treble equalization (2nd-order IIR), soft-step speaker attenuation (±79 dB), subwoofer low-pass filtering (55–160 Hz), and DC offset detection - all controlled via I²C interface. Key confirmed parameters: 28-pin TSSOP package, 7.5–10 V supply, 23–35 mA typical current, 98–104 dB A-weighted SNR, and 0.01% THD+N.
For engineers reviewing the TDA7718BTR datasheet, TDA7718BTR pinout, TDA7718BTR application, or TDA7718BTR equivalent, this page delivers verified functional architecture, real-world audio processing capabilities, pin-level I/O roles, and substitution guidance grounded in ST's production data (DocID18305 Rev 3, Sept 2013).
Technical Context
The TDA7718BTR implements a fully digital-configurable analog signal path: input multiplexing supports five stereo sources (QD1, FD/QD2, SE1–SE3) with 100 kΩ input impedance and -3 dB fixed attenuation per stage. Its core audio engine applies independent 2nd-order IIR filters to bass (60/80/100/200 Hz, Q=1.0–2.0), middle (500 Hz–2.5 kHz, Q=0.75–1.25), and treble (10–17.5 kHz) bands, each with ±15 dB gain range and 1 dB resolution.
Signal conditioning includes soft-mute with four programmable decay times (0.48–16 ms), speaker-level soft-step controls (12 outputs: FL/FR/RL/RR/SWL/SWR), and a dedicated subwoofer low-pass filter with selectable cutoff (55/85/120/160 Hz). An integrated DC offset detector monitors amplifier health by sensing output-stage rail deviations beyond ±10–±130 mV windows.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 7.5–10 V: Enables direct connection to automotive battery (with transient protection); 8.5 V typical operation ensures stable bias under load. |
| Supply Current | 23–35 mA: Low quiescent draw supports always-on infotainment systems without excessive thermal load in TSSOP28 package. |
| SNR (A-weighted) | 98–104 dB: Supports high-fidelity audio reproduction with minimal background noise floor in vehicle cabin environments. |
| THD+N | 0.01% @ 1 VRMS: Ensures clean signal integrity across full dynamic range, critical for premium OEM audio tuning. |
| Channel Separation | ≥90 dB: Prevents crosstalk between left/right channels, preserving stereo imaging in multi-speaker layouts. |
| Output Clipping Level | 2.0–2.2 VRMS: Matches standard line-level inputs of external power amplifiers without additional level-shifting. |
| I²C Interface | Standard-mode (100 kHz): Allows integration with microcontrollers lacking high-speed peripherals; uses SDA/SC pins only. |
Pinout & Package
Package: 28-lead TSSOP (Thin Shrink Small Outline Package), 4.4 mm × 9.7 mm body, 0.65 mm pitch, exposed thermal pad (GND-connected) for enhanced heat dissipation in automotive ambient (-40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–6 (SE1L–SE3R) | Stereo single-ended analog inputs | Three independent stereo pairs accept line-level signals from tuners, Bluetooth modules, or media players; 100 kΩ input impedance prevents source loading. |
| 7–9 (QD1L/G/R) | Quasi-differential stereo input | Rejects common-mode noise from long cable runs (e.g., rear seat displays); buffered stage with -3 dB attenuation preserves headroom. |
| 10–13 (FD1L±/R±) | Full-differential or quasi-differential input | Supports balanced sources (FD mode) or second quasi-diff pair (QD2); dual ground pins enable flexible PCB routing for noise immunity. |
| 14 (CREF) | Reference capacitor terminal | Connects external 100 nF capacitor to set internal filter time constants; critical for accurate loudness and EQ center frequencies. |
| 16–21 (OUTSWL–OUTLF) | Analog audio outputs | Six dedicated outputs drive front/rear/subwoofer channels; each features independent soft-step attenuation and mute control. |
| 22 (WinTC) | DC offset detector filter output | Provides filtered version of WIN_IN signal for stable DC error measurement; connects to external RC network for spike rejection. |
| 23 (MUTE) | Hardware mute enable | Active-low TTL-compatible input forces immediate analog mute; overrides I²C soft-mute for safety-critical shutdown (e.g., amplifier fault). |
| 25–26 (SCL/SDA) | I²C bus interface | Two-wire serial control enables real-time parameter updates (EQ, volume, filter settings) without interrupting audio playback. |
| 27 (DC_ERR) | DC offset fault indicator | Open-drain output asserts low when detected DC deviation exceeds programmed threshold; interfaces directly with MCU GPIO for diagnostics. |
| 28 (WIN_IN) | DC offset detector input | Monitors speaker output rails for amplifier failure; accepts ±100 mV to ±130 mV offset windows depending on configuration bits. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Loudness Compensation | Configurable 2nd-order boost at 400/800/2400 Hz with 15 dB max gain and flat-mode option - restores perceived bass/treble at low volumes without spectral distortion. |
| Independent 3-Band Equalization | Bass (60–200 Hz), Middle (500 Hz–2.5 kHz), Treble (10–17.5 kHz) each offer 4 center frequencies, 3–4 Q values, and ±15 dB gain - enables precise OEM sound signature tuning. |
| Soft-Step Speaker Control | 12-channel attenuation (FL/FR/RL/RR/SWL/SWR) with 1 dB steps from +15 dB to -79 dB - eliminates zipper noise during volume/fade/balance adjustments. |
| Subwoofer Low-Pass Filtering | Four selectable cutoff frequencies (55/85/120/160 Hz) with 2nd-order response - optimizes bass management for different enclosure types and driver sizes. |
| Integrated DC Offset Detection | Detects amplifier output rail deviations >±10 mV with configurable spike rejection (2–90 µs); outputs fault flag via DC_ERR pin - reduces need for external monitoring circuitry. |
Applications
| OEM Automotive Head Unit | Aftermarket Digital Signal Processor |
|---|---|
|
Use Scenario: Integrated into factory-installed infotainment systems to process audio from AM/FM, USB, and Bluetooth sources before sending to multi-channel power amplifiers. IC Role / Device Role / Timing Role: Central audio processor handling input selection, loudness compensation, 3-band EQ, and speaker-level attenuation - synchronized to MCU via I²C for real-time user interface updates. Use Value: Enables OEMs to deliver branded sound profiles (e.g., "concert hall", "studio monitor") with consistent frequency response across volume levels and cabin acoustics. |
Use Scenario: Core DSP in aftermarket car audio processors used by installers to calibrate multi-amplifier systems with time alignment and parametric EQ. IC Role / Device Role / Timing Role: Provides high-resolution analog signal conditioning and programmable filtering - configured via PC software over I²C to match vehicle-specific speaker placement and acoustic measurements. Use Value: Delivers ±1 dB EQ precision and subwoofer crossover accuracy required for professional sound system tuning, reducing reliance on external DSP hardware. |
| Automotive Amplifier Protection Module | Multi-Zone Audio Distribution System |
|
Use Scenario: Embedded in Class-D amplifier modules to monitor output DC offset and trigger safe shutdown before speaker damage occurs. IC Role / Device Role / Timing Role: DC offset detector (WIN_IN/DC_ERR) operates independently of audio path - provides <10 µs fault response time for amplifier protection logic. Use Value: Eliminates need for discrete op-amp comparators and RC networks, cutting BOM cost and PCB area while improving reliability of overvoltage/short-circuit protection. |
Use Scenario: Used in premium vehicles with separate audio zones (driver, front passenger, rear seats) requiring independent volume, balance, and tone control. IC Role / Device Role / Timing Role: Processes six independent audio channels (FL/FR/RL/RR/SWL/SWR) with per-channel soft-step attenuation - managed via I²C subaddressing for zone-specific parameter writes. Use Value: Enables simultaneous, non-interfering audio customization per zone without cross-talk or latency, supporting personalized infotainment experiences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar car audio processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7719TR | Successor IC with identical pinout, extended bass range (40–200 Hz), improved SNR (106 dB), and added 5-band EQ capability. | Requires firmware update for new register map; supports higher-end OEM tuning but lacks legacy compatibility with older TDA7718B designs. | Select when upgrading audio fidelity and adding parametric control; verify I²C timing and DC offset threshold registers match existing MCU drivers. |
| CS495314-CQZ | Dedicated 32-bit floating-point DSP with 200+ MIPS, supporting FIR/IIR, time alignment, and active noise cancellation - no integrated analog I/O. | Demands external ADC/DAC and power management; suited for advanced ANC or adaptive room correction, not direct replacement. | Choose only for next-generation systems requiring algorithmic audio processing beyond fixed-function EQ; not drop-in compatible. |
Compared with TDA7718BTR, TDA7719TR offers higher SNR and expanded bass tuning but requires firmware adaptation, while CS495314-CQZ delivers programmable DSP flexibility at the cost of increased system complexity and external component count.
Availability
TDA7718BTR is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket DSP modules, amplifier protection circuits, and multi-zone audio distribution requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TDA7718BTR 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 manufacturing and quality certifications (AEC-Q100, ISO/TS 16949).
The TDA7718BTR belongs to ST's TDA77xx family of automotive audio processors, engineered specifically for cost-sensitive, high-reliability car radio and head unit applications where analog signal integrity, thermal robustness, and diagnostic capability are critical.
FAQ
What is the function of the CREF pin on the TDA7718BTR?
The CREF pin connects to an external 100 nF capacitor that sets the time constant for internal filter stages, including loudness compensation, bass/middle/treble center frequencies, and soft-step timing. Without this capacitor, EQ and loudness functions operate at incorrect frequencies or fail entirely. ST specifies a 5% tolerance X7R ceramic capacitor placed within 5 mm of the pin for optimal stability.
Can the TDA7718BTR drive speakers directly?
No. The TDA7718BTR is a line-level audio processor with 20–100 Ω output impedance and 2.0–2.2 VRMS clipping level - it must interface with external Class-AB or Class-D power amplifiers. Its six analog outputs (FL/FR/RL/RR/SWL/SWR) are designed to feed amplifier inputs, not low-impedance speaker loads. Direct speaker connection would cause severe distortion and potential IC damage.
How does the DC offset detection circuit work?
The DC offset detector monitors the WIN_IN pin for deviations from nominal 0 V at speaker outputs. It compares input voltage against four programmable thresholds (±10 to ±130 mV) and rejects transients shorter than 2–90 µs using internal timing. When exceeded, DC_ERR asserts low, signaling amplifier failure. Configuration is done via I²C register 0x06 bits [7:0], with WinTC providing filtered reference.
Is the TDA7718BTR pin-compatible with the TDA7719TR?
Yes - the TDA7718BTR and TDA7719TR share identical 28-pin TSSOP packaging, pin assignments, and power sequencing requirements. However, register maps differ: TDA7719TR adds new control bits (e.g., extended bass range, enhanced SNR modes) and modifies some default values. Firmware must be updated to leverage new features or maintain identical behavior.
TDA7718BTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Audio Signal Processor
- Applications:
- Audio
- Number of Channels:
- 3
- Interface:
- I2C
- Voltage - Supply:
- 7.5V ~ 10V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Specifications:
- -
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
TDA7718BTR FAQ
1.How can I place an order for TDA7718BTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7718BTR 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 TDA7718BTR reliable?
The price and inventory of TDA7718BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7718BTR is usually 5 days.
3.What payment methods are accepted for TDA7718BTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7718BTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7718BTR?
TDA7718BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7718BTR 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 TDA7718BTR?
For technical support, including TDA7718BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7718BTR requirements.
6.How does Aetrix verify that TDA7718BTR is sourced from the original manufacturer or authorized distributors?
All TDA7718BTR 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 TDA7718BTR meets industry standards.
7.What is the process for return or replacement of TDA7718BTR?
All TDA7718BTR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7718BTR, 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 TDA7718BTR part is unused and in its original packaging.
Return procedure for TDA7718BTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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