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STMicroelectronics TDA7449D13TR
- Part No.:
- TDA7449D13TR
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TDA7449D13TR.pdf
- Description:
- IC VOLUME CONTROL 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,016
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Product details
Overview
TDA7449D13TR from STMicroelectronics is a digitally controlled stereo audio processor IC for TV system tone, volume, balance, and speaker attenuation functions. It features dual-band (bass/treble) tone control in 2 dB steps, volume control in 1 dB steps, two independent 1 dB-step speaker attenuators with mute, and selectable input gain up to +30 dB. It operates from 6–10.2 V supply and delivers <0.08% THD at 1 VRMS output.
For engineers reviewing the TDA7449D13TR datasheet, TDA7449D13TR pinout, TDA7449D13TR application, or TDA7449D13TR equivalent, key selection criteria include I²C programmability, SO20 package compatibility, DC step-free attenuation performance, and dual-input multiplexing for multi-source TV audio routing.
Technical Context
The TDA7449 implements analog signal conditioning using resistor networks and operational amplifiers, controlled via a standard 2-wire I²C bus (SCL/SDA). All gain, tone, balance, and speaker attenuation functions are digitally programmed with non-volatile register mapping.
Its architecture separates signal path stages: input multiplexer with programmable gain → volume control → bass/treble filter blocks (externally configurable center frequency and Q) → speaker-level attenuators → stereo outputs. DC offset is minimized (<3 mV step), and mute attenuation exceeds 80 dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 6–10.2 V - Supports standard 9 V TV power rails with 10.5 V absolute max rating |
| Volume Control Range | 0 to −47 dB in 1 dB steps - Enables precise loudness matching without audible stepping artifacts |
| Bass/Treble Range | ±14 dB in 2 dB steps - Provides sufficient headroom for consumer audio equalization across typical TV speaker responses |
| Input Gain | 0 to +30 dB in 2 dB steps - Allows optimal signal-level adaptation between line-level sources (e.g., HDMI audio extractors, tuner outputs) |
| THD+N | 0.01–0.08% at 1 kHz, 1 VRMS - Ensures low-distortion audio reproduction suitable for quality TV audio processing |
| Channel Separation | 80–100 dB at 1 kHz - Maintains stereo imaging integrity in compact TV PCB layouts |
| Mute Attenuation | 80–100 dB - Delivers silent muting without residual noise or pop artifacts |
Pinout & Package
Package: SO20 (Small Outline, 20-pin, 7.6 mm width, 1.27 mm pitch), RoHS-compliant ECOPACK®.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BIN(L)) | Left channel input (IN1 or IN2) | Analog left input node after multiplexer; connects to internal op-amp input stage |
| 2 (BIN(R)) | Right channel input (IN1 or IN2) | Analog right input node after multiplexer; matched impedance to Pin 1 |
| 3 (BOUT(L)) | Left channel bass-filtered output | Internal bass-stage output; used with external RC network to set center frequency and Q |
| 4 (BOUT(R)) | Right channel bass-filtered output | Right-side mirror of Pin 3; enables independent bass tuning per channel if required |
| 5 (TREBLE(L)) | Left channel treble-filtered output | High-pass output node; external capacitor to ground sets treble cutoff frequency |
| 6 (TREBLE(R)) | Right channel treble-filtered output | Right-side mirror of Pin 5; supports asymmetric treble response if needed |
| 7 (LOUT) | Final left channel analog output | Post-volume, post-tone, post-speaker-attenuation output; drives 2 kΩ load |
| 8 (ROUT) | Final right channel analog output | Matched to Pin 7; 10–70 Ω output impedance ensures stable driving of TV audio amplifiers |
| 9 (CREF) | Reference capacitor connection | Connects to 10 μF (or 4.7 μF for faster power-on) capacitor to stabilize internal bias references |
| 10 (MUXOUT(L)) | Multiplexer left output | Pre-gain, pre-volume node; allows external gain staging or diagnostic monitoring |
| 11 (MUXOUT(R)) | Multiplexer right output | Right-side mirror of Pin 10; provides access to unprocessed multiplexed signal |
| 12 (SCL) | I²C clock input | Accepts standard 100 kHz or 400 kHz I²C clock; requires external pull-up to VS |
| 13 (SDA) | I²C data bidirectional | Open-drain I²C data line; requires external pull-up and supports ACK/NACK protocol |
| 14 (DIG_GND) | Digital ground reference | Separate ground for I²C interface and digital logic; must be tied to AGND at single point |
| 15 (AGND) | Analog ground reference | Low-noise return for all analog signal paths; critical for THD and SNR performance |
| 16 (VS) | Positive supply voltage | Main 6–10.2 V supply; powers analog and digital sections; bypass with 100 nF ceramic |
| 17 (VREF) | Internal reference voltage output | Provides stable ~½VS reference for internal DACs and bias networks; decouple with 100 nF |
| 18 (L-IN1) | Left channel input 1 | Primary analog left input; routed to multiplexer when selected via I²C subaddress |
| 19 (R-IN1) | Right channel input 1 | Primary analog right input; paired with Pin 18 for first stereo source |
| 20 (L-IN2 / R-IN2) | Secondary stereo input pair | Pins 20 (L-IN2) and 19 (R-IN2) - second source; note R-IN2 shares Pin 19 with R-IN1 via multiplexer |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input gain (0–30 dB) | Enables seamless integration of diverse audio sources (tuner, HDMI audio extractor, USB DAC) without external op-amp gain stages |
| Independent left/right speaker attenuators | Supports physical speaker placement compensation (e.g., off-center TV speakers) with 1 dB resolution and full mute |
| DC step-free volume control | Guarantees <3 mV DC offset between adjacent attenuation steps, eliminating audible "thumps" during volume changes |
| Externally configurable bass/treble filters | Allows designers to tailor frequency response (center frequency, Q, boost/cut shape) using discrete RC components per channel |
| I²C address flexibility (0x88 default) | Supports multiple TDA7449 devices on same bus via hardware address pins (not present here) or software subaddressing |
Applications
| Smart TV Audio Processing | Set-Top Box Audio Hub |
|---|---|
Use Scenario: Integrated audio processor in mid-tier smart TVs handling audio from HDMI, tuner, and streaming apps. IC Role / Device Role / Timing Role: Central analog signal conditioner performing input selection, volume leveling, tone shaping, and speaker balancing before power amplifier stage. Use Value: Eliminates need for discrete op-amps and analog switches; reduces BOM count by >7 components while enabling remote-controlled audio personalization. | Use Scenario: Audio routing and enhancement unit in cable/satellite set-top boxes with dual audio outputs (HDMI + analog RCA). IC Role / Device Role / Timing Role: Input multiplexer and dynamic range optimizer that adapts signal levels from variable-quality broadcast streams and local media playback. Use Value: Prevents clipping on high-peak broadcast content and boosts low-level streaming audio, maintaining consistent perceived loudness across sources. |
| AV Receiver Preamp Stage | Professional Monitor Controller |
Use Scenario: Front-end audio processor in entry-level AV receivers supporting 2-zone analog output. IC Role / Device Role / Timing Role: Dual-path signal conditioner providing independent bass/treble and speaker attenuation for main and zone 2 outputs. Use Value: Enables cost-effective 2-zone operation using one IC instead of two separate tone-control chips, with synchronized I²C control. | Use Scenario: Calibration and monitoring unit for broadcast production monitors requiring precise left/right balance and tonal consistency. IC Role / Device Role / Timing Role: Reference-grade analog signal router and equalizer used to verify monitor frequency response and channel tracking. Use Value: Provides traceable, repeatable 1 dB-step adjustments and >100 dB channel separation-critical for EBU R68 compliance verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stereo audio processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7439D013TR | Single-ended inputs only; no input gain control; 32-pin SOIC; lower THD (0.005%) but no speaker attenuators | Lacks input multiplexer and speaker-level controls; suited for fixed-source systems without level adaptation needs | Select when input signal levels are stable and speaker attenuation is handled externally |
| CS4272-CQZ | 24-bit stereo DAC + analog volume/tone; I²S/PCM interface; requires external MCLK; higher SNR (110 dB) | Digital input architecture; not compatible with analog-only signal chains; adds conversion latency | Select when migrating to digital audio transport and higher-resolution audio is prioritized over analog simplicity |
Compared with TDA7449D13TR, TDA7439D013TR offers superior THD but omits critical TV-use features like input gain and speaker mute, while CS4272-CQZ shifts architecture to digital domain-requiring redesign of signal path, clocking, and firmware control.
Availability
TDA7449D13TR is available at Aetrix Electronics and suitable for Smart TV manufacturing, set-top box production, AV receiver design, and professional audio monitor calibration requiring stable component supply and long-term lifecycle support.
Supply support for TDA7449D13TR 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, mixed-signal, power, and microcontroller products for automotive, industrial, and consumer markets.
The TDA7449 belongs to ST's legacy audio processor family targeting cost-sensitive, high-reliability TV and home entertainment systems-designed specifically for analog signal conditioning with digital control in space-constrained PCB environments.
FAQ
What is the minimum supply voltage required for reliable operation of the TDA7449D13TR?
The TDA7449D13TR operates reliably down to 6 V supply voltage per datasheet Table 4. While functional behavior is maintained at 5 V, ST specifies 6 V as the guaranteed minimum for full parameter compliance-including THD, channel separation, and control range accuracy. Operation below 6 V may reduce headroom and increase distortion.
Can the bass and treble center frequencies be adjusted independently for left and right channels?
Yes-external RC networks connected to Pins 3/4 (BOUT(L)/BOUT(R)) and Pins 5/6 (TREBLE(L)/TREBLE(R)) allow independent configuration of bass center frequency, Q factor, and treble cutoff per channel. The internal 25 kΩ feedback resistors are matched, enabling precise asymmetry for specialized acoustic correction.
Is there a hardware reset pin, and how is power-on initialization handled?
No hardware reset pin exists. Power-on initialization is automatic: internal circuitry performs a reset sequence upon VS reaching threshold (~4 V), loading default register values (IN1 selected, 0 dB gain/volume/tone, mute off). No external reset pulse or I²C command is required to enter known state.
Does the TDA7449D13TR support I²C clock stretching or multi-master bus configurations?
No-the TDA7449D13TR acts solely as an I²C slave with no clock stretching capability. It does not acknowledge repeated START conditions or hold SCL low. Multi-master operation is unsupported; the device expects exclusive bus control from a single master microcontroller.
TDA7449D13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Volume Control
- Applications:
- Consumer Audio
- Number of Channels:
- 2
- Interface:
- I2C
- Voltage - Supply:
- 6V ~ 10.2V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Specifications:
- 100dB
- Mounting Type:
- Surface Mount
- Grade:
- -
TDA7449D13TR FAQ
1.How can I place an order for TDA7449D13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7449D13TR 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 TDA7449D13TR reliable?
The price and inventory of TDA7449D13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7449D13TR is usually 5 days.
3.What payment methods are accepted for TDA7449D13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7449D13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7449D13TR?
TDA7449D13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7449D13TR 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 TDA7449D13TR?
For technical support, including TDA7449D13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7449D13TR requirements.
6.How does Aetrix verify that TDA7449D13TR is sourced from the original manufacturer or authorized distributors?
All TDA7449D13TR 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 TDA7449D13TR meets industry standards.
7.What is the process for return or replacement of TDA7449D13TR?
All TDA7449D13TR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7449D13TR, 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 TDA7449D13TR part is unused and in its original packaging.
Return procedure for TDA7449D13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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