My Inquiry
My Account
STMicroelectronics TDA7429T
- Part No.:
- TDA7429T
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 44-LQFP
- Datasheet:
-
TDA7429T.pdf
- Description:
- IC AUDIO TONE PROCESSOR 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,792
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TDA7429T from STMicroelectronics is a digitally controlled audio processor IC designed for stereo tone, balance, and surround-sound matrix processing in TV and Hi-Fi systems. It features 3 stereo inputs, independent 4-speaker attenuation (0–79 dB in 1 dB steps), treble/middle/bass control (±14 dB in 2 dB steps), and three programmable surround modes (Music, Movie, Simulated) with up to 256 selectable responses. Its I²C serial interface enables full configuration of all functions.
For engineers reviewing the TDA7429T datasheet, TDA7429T pinout, TDA7429T application, or TDA7429T equivalent, this device serves as a complete analog audio signal conditioner - supporting input multiplexing, phase-shift-based surround synthesis, speaker-level balancing, mute control, and DC-coupled monitor outputs - with verified performance at 9 V supply, <0.1% THD, 106 dB SNR, and 90 dB channel separation.
Technical Context
The TDA7429T implements a BIPOLAR/CMOS hybrid architecture to achieve low distortion (<0.1% THD), low noise (4 µVrms output noise in OFF mode), and zero DC stepping. Signal conditioning is performed via resistor-network-based operational amplifier stages, with programmable gain/attenuation applied before and after dedicated bass/middle/treble filter blocks.
Surround sound generation uses four independently configurable phase shifters (RPS1–RPS4) and a mixing matrix to derive rear/surround channels from stereo inputs. All controls - including 0.5 dB input attenuation, 1 dB speaker attenuation, and ±14 dB tone adjustments - are set via I²C commands targeting specific subaddress registers (e.g., 0x00 for input attenuation, 0x01 for surround control).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 7–10.2 V - Operates from single 9 V rail; supports standard TV/HDTV power domains. |
| THD + N | 0.01–0.1% - Measured at 1 kHz, 1 Vrms input; ensures high-fidelity audio path integrity. |
| Signal-to-Noise Ratio | 106 dB - Achieved with mute enabled and flat response; critical for quiet background audio playback. |
| Channel Separation | 90 dB - Maintains left/right signal isolation across full audio band (20 Hz–20 kHz). |
| Input Attenuation Range | 0 to −31.5 dB in 0.5 dB steps - Enables precise level matching between multiple analog sources. |
| Speaker Attenuation Range | 0 to −79 dB in 1 dB steps - Supports independent volume leveling across four speakers for balanced surround imaging. |
| Tone Control Range | ±14 dB in 2 dB steps for bass/middle/treble - Provides wide equalization headroom without clipping. |
Pinout & Package
TDA7429T is housed in a 44-pin TQFP (10 × 10 × 1.4 mm) package with exposed thermal pad, rated for 0–70 °C ambient operation and 85 °C/W junction-to-pin thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA / SCL | I²C serial data/clock | Two-wire interface for register writes; requires external 4.7 kΩ pull-ups to VS. |
| L_IN1–L_IN4, R_IN1–R_IN4 | Stereo input channels | Four differential-capable analog inputs; selected via I²C-controlled multiplexer. |
| L_OUT / R_OUT | Main stereo outputs | DC-coupled, 50 Ω output impedance; drive 10 kΩ loads directly. |
| MONITOR_L / MONITOR_R | Dedicated monitor outputs | DC-coupled, 4.5 V DC bias; used for real-time signal diagnostics without affecting main path. |
| BASSO_L / BASSO_R | Bass-optimized outputs | Low-pass filtered (90 Hz cutoff) outputs for subwoofer or bass management. |
| REARIN / REAROUT | Rear channel interface | Enables discrete rear channel injection or extraction in surround configurations. |
| PS1–PS4 | Phase shifter resistors | Analog pins setting RPS1–RPS4 values; determine surround effect depth and spatial character. |
| CREF | Reference capacitor connection | Connects 100 nF capacitor to stabilize internal bias; critical for distortion and offset performance. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable surround modes | Three distinct architectures: Music (4 fixed responses), Movie (256 phase-matrix combinations), Simulated (3-band derived rear signals). |
| Independent speaker attenuation | Four-channel control (L/R front + L/R rear) with 1 dB resolution and 79 dB range - enables precise acoustic calibration. |
| DC-coupled monitor outputs | MONITOR_L/MONITOR_R provide true DC-biased copies of L_OUT/R_OUT - eliminates coupling capacitors in test/debug paths. |
| Integrated tone control filters | Dedicated bass (90 Hz LPF), middle (400 Hz BPF), treble (4 kHz HPF) sections with ±14 dB gain adjustment per band. |
| I²C address flexibility | Fixed 8-bit slave address 0x80 (10000000b); supports multi-device bus with no address conflict risk. |
Applications
| Home Theater AV Receiver | Smart TV Audio Processor |
|---|---|
Use Scenario: Integrated into mid-tier AV receivers to deliver Dolby Pro Logic–compatible surround from stereo broadcast sources. IC Role / Device Role / Timing Role: Performs matrix decoding, phase shifting, and speaker-level balancing using PS1–PS4 resistor networks and I²C-configured gain tables. Use Value: Eliminates need for external op-amp networks and digital DSP; achieves 90 dB channel separation and <0.1% THD at 9 V supply. | Use Scenario: Embedded in 4K Smart TVs to enhance built-in speaker systems with virtual surround and bass extension. IC Role / Device Role / Timing Role: Acts as primary analog audio conditioner - accepting HDMI ARC, optical, and analog inputs, then applying tone/surround/mute per user profile. Use Value: Delivers 106 dB SNR and 79 dB speaker attenuation range, enabling clean audio playback even during low-volume nighttime viewing. |
| Hi-Fi Stereo Preamp | Professional Audio Monitor Controller |
Use Scenario: Used in compact stereo preamplifiers to replace mechanical potentiometers with digital precision and recallable settings. IC Role / Device Role / Timing Role: Provides 0.5 dB input attenuation, ±14 dB tone control, and L/R balance - all stored and restored via I²C EEPROM interface. Use Value: Ensures repeatable channel matching (±0.5 dB gain error) and eliminates mechanical wear in consumer-grade volume controls. | Use Scenario: Deployed in broadcast studio monitor controllers to route and condition reference audio feeds for on-air talent and engineering staff. IC Role / Device Role / Timing Role: Supplies DC-coupled MONITOR_L/MONITOR_R outputs with 4.5 V bias - allowing oscilloscope-based signal integrity verification without AC coupling artifacts. Use Value: Enables real-time waveform analysis of L/R paths while maintaining full dynamic range and zero DC offset drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7430T | Successor IC with enhanced SNR (110 dB), wider tone range (±16 dB), and integrated headphone driver; same TQFP44 footprint. | Supports direct headphone output and higher-resolution tone control; lacks REARIN/REAROUT pins. | Select when upgrading legacy designs requiring improved noise floor and headphone capability - not drop-in compatible due to pin function changes. |
| CS4272-CQZ | 24-bit stereo DAC + analog audio processor; includes ADC, digital volume, and I²S interface - fundamentally different architecture. | Requires digital audio source (I²S/PCM); adds conversion latency and clock domain complexity. | Choose only if system already uses digital audio transport and needs integrated ADC/DAC - not suitable for pure analog signal chain replacement. |
Compared with TDA7429T, TDA7430T offers higher fidelity and integration but removes rear channel I/O; CS4272-CQZ shifts processing to digital domain, increasing BOM cost and design complexity for analog-only systems.
Availability
TDA7429T is available at Aetrix Electronics and suitable for home theater receivers, smart TV audio subsystems, Hi-Fi preamplifiers, and professional audio monitor controllers requiring stable component supply and long-term manufacturability.
Supply support for TDA7429T 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 TDA7429T belongs to ST's legacy audio processor product line, engineered specifically for cost-sensitive, high-fidelity analog audio signal conditioning in TV and home entertainment systems - emphasizing low THD, high channel separation, and flexible I²C configurability.
FAQ
What is the minimum supply voltage required for stable operation of the TDA7429T?
The TDA7429T operates reliably from 7 V to 10.2 V, with typical performance characterized at 9 V. Below 7 V, internal biasing fails, causing increased THD (>0.5%), loss of mute functionality, and potential I²C communication errors. The device draws 10–26 mA depending on active features and output loading.
How does the TDA7429T implement surround sound without external DSP?
It uses four analog phase shifters (PS1–PS4) combined with a passive signal matrix to generate time-delayed and amplitude-weighted rear/surround signals from stereo inputs. Each phase shifter's resistance value (e.g., RPS1 = 8.3–48.85 kΩ) is set by external resistors, and the resulting phase relationships are mixed to create Music, Movie, or Simulated surround modes - all without digital signal processing.
Can the MONITOR_L and MONITOR_R outputs be used as primary audio outputs?
No - MONITOR_L/R are diagnostic outputs with fixed 4.5 V DC bias and identical AC signal content to L_OUT/R_OUT, but they lack dedicated output drivers and current capability. They are intended solely for oscilloscope probing or level metering; driving speakers or headphones from them risks distortion and instability due to insufficient drive strength.
Is the TDA7429T pin-compatible with the SDIP42-packaged TDA7429S?
No - TDA7429T (TQFP44) and TDA7429S (SDIP42) have different pin counts, layouts, and signal assignments. While both share identical functional registers and I²C protocol, key pins like PS1–PS4, CREF, and REARIN/REAROUT are relocated or absent in SDIP42. PCB redesign and schematic revision are required for substitution.
TDA7429T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 44-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Audio Tone Processor
- Applications:
- Consumer Audio
- Number of Channels:
- 2
- Interface:
- I2C
- Voltage - Supply:
- 7V ~ 10.2V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Specifications:
- 0.5dB
- Mounting Type:
- Surface Mount
- Grade:
- -
TDA7429T FAQ
1.How can I place an order for TDA7429T through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7429T 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 TDA7429T reliable?
The price and inventory of TDA7429T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7429T is usually 5 days.
3.What payment methods are accepted for TDA7429T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7429T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7429T?
TDA7429T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7429T 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 TDA7429T?
For technical support, including TDA7429T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7429T requirements.
6.How does Aetrix verify that TDA7429T is sourced from the original manufacturer or authorized distributors?
All TDA7429T 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 TDA7429T meets industry standards.
7.What is the process for return or replacement of TDA7429T?
All TDA7429T units undergo pre-shipment inspection (PSI). If there is an issue with TDA7429T, 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 TDA7429T part is unused and in its original packaging.
Return procedure for TDA7429T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TDA7429T Tags
-
SA571DR2G
onsemi
-
ADAU7002ACBZ-R7
Analog Devices Inc.
-
DRV135UA/2K5
Texas Instruments
-
DRV134UA/1K
Texas Instruments
-
DRV134PA
Texas Instruments
-
DRV134UA
Texas Instruments
-
DRV135UA
Texas Instruments
-
SA572DR2G
onsemi
-
PGA2311U/1K
Texas Instruments
-
SI8244BB-D-IS1R
Skyworks Solutions Inc.
-
CS8416K-CZZR
Cirrus Logic Inc.
-
SRC4392IPFBR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
