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STMicroelectronics STA311BTR
- Part No.:
- STA311BTR
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
STA311BTR.pdf
- Description:
- IC FULLY INTEG PROCESSR 56VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,972
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Product details
Overview
STA311BTR from STMicroelectronics is an 8-channel, 24-bit multichannel digital audio processor with FFX™ PWM output architecture, designed for high-fidelity home theater and AV receiver systems. It supports 32–192 kHz input sampling rates, delivers >100 dB SNR, integrates dual limiters/compressors, and enables per-channel 32-bit biquad EQ with up to 10 filters per channel.
For engineers reviewing the STA311BTR datasheet, STA311BTR pinout, STA311BTR application, or STA311BTR equivalent, this device is selected for advanced audio preprocessing in 5.1/7.1 surround sound systems requiring pop-free startup, dynamic range compression, bass management, and I²S recombination - with emphasis on real-time DSP configurability via I²C.
Technical Context
The STA311BTR implements a fully programmable 8-channel audio signal path with pre- and post-EQ mixing, independent channel mapping, and dual 32-bit limiter/compressor engines supporting both anti-clipping and DRC modes. Its internal 192 kHz/36-bit processing engine enables high-precision filtering and gain staging.
FFX™ PWM output supports selectable damped ternary or binary modulation per channel, with variable per-channel delay control and max power correction to reduce full-power THD. AM interference suppression includes automatic PWM frequency shifting and noise suppression modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8-channel digital audio processing with independent volume, mute, trim (±10 dB), and DSP bypass per channel |
| Resolution & SNR | 24-bit data path with >100 dB signal-to-noise ratio and dynamic range - ensures low-noise high-fidelity audio reproduction |
| Sampling Rates | Input: 32 kHz to 192 kHz; internal processing: 192 kHz at 36-bit precision - supports high-res audio formats including DSD/SACD (6 channels) |
| DSP Resources | Up to 10 user-programmable 32-bit biquad filters per channel; 5-band graphic EQ; 32 preset EQ curves; bass/treble tone control |
| Output Interface | I²S recombination interface with configurable channel mapping; FFX™ PWM output with damped ternary/binary mode selection |
| Control Interface | I²C bus (standard/fast-mode) for register configuration, coefficient loading, and real-time parameter updates |
| Power Management | Automatic amplifier power-down on clock loss; zero-detect and invalid-input mute; soft/hard mute per channel and master |
Pinout & Package
VFQFPN-56 (8 × 8 mm) package with exposed thermal pad; RoHS-compliant, lead-free, and suitable for automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | Digital I/O supply | 3.3 V supply for I²C, SAI, and control logic - decoupling required per datasheet layout guidelines |
| VDDA | Analog supply | 3.3 V analog core supply - separate from VDDIO to minimize digital noise coupling into audio paths |
| AVSS / DVSS | Analog & digital ground | Separate analog/digital ground planes required; connected only at single point near exposed pad |
| SCL / SDA | I²C interface | Standard-mode/fast-mode I²C bus for configuration and coefficient writes; pull-up resistors required externally |
| LRCLK / BCLK / SDIN / SDOUT | Serial audio interface (SAI) | Supports I²S, left-justified, right-justified formats; SDIN/SDOUT are bidirectional for flexible input/output routing |
| PCMx_OUT[7:0] | FFX™ PWM outputs | Eight dedicated PWM output terminals; each configurable for damped ternary or binary mode with independent delay control |
| RESET_N | Active-low hardware reset | Asynchronous reset input - initiates full internal register initialization and pop-free startup sequence |
Key Features
| Feature | Design Value |
|---|---|
| Pop-free operation | Hardware-assisted startup/shutdown sequencing eliminates audible transients in single-ended amplifier configurations |
| AutoModes suite | Preloaded configurations including 5.1→2.0 downmix, movie nighttime mode, TV commercial AGC, and 5.1/2.1 bass management - reduces firmware development effort |
| Dynamic range control | Dual independent limiters with programmable attack/release thresholds and AC/DRC modes - enables adaptive loudness management without clipping |
| Flexible channel routing | Per-channel input mapping to any processing channel and I²S output remapping - supports custom speaker topologies and multi-zone audio distribution |
| AM interference mitigation | Automatic PWM frequency shifting and noise suppression modes - maintains audio integrity in environments with strong AM radio band emissions |
Applications
| Home Theater AV Receiver | High-End Soundbar System |
|---|---|
Use Scenario: 7.1-channel surround decoding and post-processing before Class-D amplification. IC Role / Device Role / Timing Role: Central multichannel audio processor handling input mixing, EQ, bass management, and FFX™ PWM generation synchronized to system clock. Use Value: Enables discrete 7.1 output with <100 dB SNR, pop-free transitions between sources, and real-time dynamic range adaptation for varying content loudness. |
Use Scenario: Compact 5.1 virtualization and beamforming-ready audio preprocessing in slim-profile soundbars. IC Role / Device Role / Timing Role: Audio hub managing HDMI/SPDIF/I²S inputs, applying spatial enhancement algorithms, and driving multi-channel Class-D amps via FFX™ PWM. Use Value: Delivers wide soundstage imaging using 5.1 downmix presets and automatic volume-controlled loudness - critical for consistent listening across TV, streaming, and gaming content. |
| Professional Studio Monitor Controller | Automotive Infotainment Head Unit |
Use Scenario: Reference-grade monitor controller with precise channel trimming, latency-matched outputs, and analog/digital source switching. IC Role / Device Role / Timing Role: High-precision digital audio router and processor with ±0.5 dB gain resolution, individual channel trim (±10 dB), and zero-latency mute control. Use Value: Provides studio-grade calibration capability via 32-bit biquads and RMS-based level monitoring - essential for critical listening and A/B comparison workflows. |
Use Scenario: Integrated audio processor in automotive head units supporting Bluetooth, USB, and tuner inputs with cabin-specific acoustic compensation. IC Role / Device Role / Timing Role: Real-time audio conditioner applying AM noise suppression, preset EQ curves (e.g., "rock", "jazz"), and automatic volume leveling across diverse media sources. Use Value: Maintains intelligibility and comfort during vehicle motion via anti-clipping modes and 5-band graphic EQ optimized for cabin acoustics - validated for automotive temperature and EMI requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel digital audio processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STA326BTR | Successor IC with enhanced 192 kHz/36-bit processing, expanded AutoModes, and improved AM suppression - same VFQFPN-56 footprint but higher I²C address and register map | Targets next-gen AV receivers requiring deeper DRC customization and extended bass management (e.g., subwoofer phase alignment) | Select when upgrading legacy designs needing backward-compatible pinout but greater processing headroom and updated feature set |
| TAS5634PHPR | TI Class-D modulator + DSP combo; integrated gate drivers; no external FFX™ PWM stage required - different architecture (analog input support, built-in power stage control) | Better suited for integrated amplifier modules where digital audio input is processed and directly drives MOSFET half-bridges | Choose for cost-sensitive, space-constrained designs where combining DSP and power stage control simplifies BOM and layout |
Compared with STA326BTR, the STA311BTR offers mature, production-proven stability with full AutoModes coverage but lacks newer features like extended LUT-based DRC. Versus TAS5634PHPR, it provides superior flexibility in external amplifier pairing and higher-resolution biquad filtering, at the cost of requiring discrete power stage design.
Availability
STA311BTR is available at Aetrix Electronics and suitable for home theater AV receivers, premium soundbars, professional monitor controllers, and automotive infotainment head units requiring stable component supply and long-term production continuity.
Supply support for STA311BTR 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 microcontrollers, power management, analog, and audio ICs for industrial, automotive, and consumer markets.
The STA311BTR belongs to ST's FFX™ digital audio processor product line, engineered specifically for high-fidelity multichannel audio preprocessing in cost-sensitive yet performance-demanding consumer audio equipment.
FAQ
Does the STA311BTR support DSD audio input?
Yes - the STA311BTR supports up to 6 channels of native DSD/SACD input, processed through its 24-bit/192 kHz pipeline with optional conversion to PCM for downstream EQ and limiting. DSD data is accepted via the serial audio interface in dedicated DSD format mode, as defined in Section 4.2 of the datasheet.
What is the function of the I²S recombination interface?
The I²S recombination interface allows remapping of any internal processing channel to any physical I²S output pair, enabling flexible speaker assignment (e.g., routing center channel to I²S0 while sending surround back to I²S2). It supports simultaneous 5.1- and 2-channel outputs, critical for multi-zone audio distribution without external multiplexing.
How does the "max power correction" feature reduce THD?
Max power correction dynamically adjusts PWM duty cycle based on instantaneous output level to minimize distortion at full-scale conditions. Implemented via MPCC1–MPCC2 registers (0x4D–0x4E), it applies calibrated correction coefficients to maintain linear output swing - reducing full-power THD by up to 3 dB compared to uncorrected FFX™ operation.
Can the STA311BTR operate without an external microcontroller?
No - the STA311BTR requires external I²C initialization to configure registers, load biquad coefficients, and enable AutoModes. It has no internal boot ROM or autonomous startup sequence; all DSP functionality is controlled via host processor commands, making it unsuitable for standalone operation.
STA311BTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Fully Integrated Processor
- Applications:
- Pre-Amplifier
- Number of Channels:
- 8
- Interface:
- I2C, I2S
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Specifications:
- Full Flexible Amplification
- Mounting Type:
- Surface Mount
- Grade:
- -
STA311BTR FAQ
1.How can I place an order for STA311BTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STA311BTR 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 STA311BTR reliable?
The price and inventory of STA311BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STA311BTR is usually 5 days.
3.What payment methods are accepted for STA311BTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STA311BTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STA311BTR?
STA311BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STA311BTR 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 STA311BTR?
For technical support, including STA311BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STA311BTR requirements.
6.How does Aetrix verify that STA311BTR is sourced from the original manufacturer or authorized distributors?
All STA311BTR 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 STA311BTR meets industry standards.
7.What is the process for return or replacement of STA311BTR?
All STA311BTR units undergo pre-shipment inspection (PSI). If there is an issue with STA311BTR, 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 STA311BTR part is unused and in its original packaging.
Return procedure for STA311BTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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