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Texas Instruments PGA2311U
- Part No.:
- PGA2311U
- Manufacturer:
- Texas Instruments
- Category:
- Audio Special Purpose
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PGA2311U.pdf
- Description:
- IC VOLUME CONTROL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:286
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Product details
Overview
PGA2311U from Texas Instruments is a stereo analog audio volume control IC with independent left/right channels, serial 3-wire interface (CS/SDI/SCLK), zero-crossing detection for glitch-free level transitions, and ±5-V analog / +5-V digital supply operation. It delivers 120-dB dynamic range, −130 dBFS interchannel crosstalk, and 0.0004% THD+N at 1 kHz in U-grade configuration - deployed in professional mixing consoles and high-end A/V receivers.
For engineers reviewing the PGA2311U datasheet, PGA2311U pinout, PGA2311U application, or PGA2311U equivalent, this page provides verified functional identity, SOIC-16 package mapping, confirmed gain range (+31.5 dB to −95.5 dB in 0.5-dB steps), real-world noise performance, and daisy-chain capability for multi-device audio control systems.
Technical Context
The PGA2311U implements digitally controlled analog attenuation using a precision resistor ladder, analog switch array, and high-performance op-amp output stage - all fabricated in sub-micron CMOS. Gain is set via 8-bit straight-binary codes per channel (L[7:0], R[7:0]), supporting mute (N=0) and full-range adjustment (N=1 to 255).
Its serial interface operates up to 6.25 MHz with MSB-first timing, supports daisy-chaining via SDO→SDI cascading, and includes hardware MUTE (pin 8) and zero-crossing enable (pin 1) for synchronized, artifact-free transitions. Power-up defaults to software mute (00h) after internal offset calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | +31.5 dB to −95.5 dB in precise 0.5-dB steps - enables fine-grained volume resolution across professional audio signal chains. |
| THD+N (1 kHz) | 0.0004% typical - ensures ultra-low distortion for critical listening paths without post-processing compensation. |
| Dynamic Range | 120 dB - supports high-fidelity playback of 24-bit audio content with full SNR preservation. |
| Interchannel Crosstalk | −130 dBFS - prevents audible leakage between left/right channels in stereo imaging-sensitive applications. |
| Supply Voltages | ±5 V analog (VA+, VA−), +5 V digital (VD+) - separates analog signal integrity from digital switching noise. |
| Serial Clock Max | 6.25 MHz - allows fast host MCU communication without requiring high-speed peripherals or FPGA logic. |
| Output Drive | Direct 660-Ω load capability - eliminates need for external buffer stages in line-level output designs. |
Pinout & Package
PGA2311U is housed in a 16-pin SOIC (DW) package measuring 7.5 mm × 10.30 mm, with moisture sensitivity level (MSL) 2–260°C–1 year, RoHS-compliant, and optimized for surface-mount assembly in audio PCBs with split analog/digital ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ZCEN) | Zero-crossing enable input | Active-high control to synchronize gain changes with input signal zero crossings - eliminates audible clicks during volume adjustments. |
| 2 (CS) | Chip-select input | Active-low enable for serial data loading - required LOW for entire 16-bit transfer cycle (8 bits per channel). |
| 3 (SDI) | Serial data input | Latches 16-bit gain word on rising SCLK edge - MSB-first, straight binary format (R[7:0] then L[7:0]). |
| 4 (VD+) | Digital power supply | +5 V rail isolated from analog supplies - powers logic core and serial interface, minimizing digital noise coupling. |
| 5 (DGND) | Digital ground | Reference for digital I/O pins only - must be physically separated from AGND and joined at single point per layout guidelines. |
| 6 (SCLK) | Serial clock input | Drives SDI sampling and SDO output timing - max 6.25 MHz; pulse widths ≥80 ns required for reliable operation. |
| 7 (SDO) | Serial data output | Tri-state output active when CS = LOW - enables daisy-chaining by feeding to next device's SDI pin. |
| 8 (MUTE) | Mute control input | Active-low hardware mute - disconnects outputs and terminates them with 10-kΩ resistors to AGND for silent shutdown. |
| 9 (VINR) | Analog input, right channel | Unbalanced input referenced to AGNDR - accepts up to 2.5 Vrms without clipping; optimal with ≤600 Ω source impedance. |
| 10 (AGNDR) | Analog ground, right channel | Reference plane for right-channel analog signals - must be routed separately from DGND and connected at single star point. |
| 11 (VOUTR) | Analog output, right channel | Buffered output capable of driving 660 Ω directly - swing limited to ±3.75 V (1.25 V from VA+/VA− rails). |
| 12 (VA+) | Analog power supply, +5 V | Positive analog rail - powers internal op-amps and resistor network; requires local 0.1-μF bypass capacitor. |
| 13 (VA−) | Analog power supply, −5 V | Negative analog rail - symmetrical to VA+ for rail-to-rail signal handling and minimized even-order distortion. |
| 14 (VOUTL) | Analog output, left channel | Identical to VOUTR - fully independent output with same drive strength, voltage range, and noise performance. |
| 15 (AGNDL) | Analog ground, left channel | Reference plane for left-channel analog signals - kept separate from AGNDR until joined at system-level ground point. |
| 16 (VINL) | Analog input, left channel | Unbalanced input referenced to AGNDL - functionally identical to VINR with matched gain error (±0.05 dB) and matching. |
Key Features
| Feature | Design Value |
|---|---|
| Noise-free level transitions | Zero-crossing detection (hardware-enabled) or 16-ms timeout ensures mute/gain changes occur without audible artifacts. |
| Daisy-chain support | SDO-to-SDI cascading allows single 3-wire bus to control N devices using 16×N-bit shift register protocol. |
| Hardware + software mute | Dedicated MUTE pin (pin 8) and register-based all-zero code provide dual-path silent operation with independent timing. |
| High-precision gain matching | ±0.05 dB interchannel gain matching - preserves stereo image integrity across volume sweeps and channel balance. |
| Low-noise analog architecture | 120-dB dynamic range and 2.5–4 μVRMS output noise - meets professional audio requirements without external filtering. |
Applications
| Professional Mixing Console | Broadcast Studio Equipment |
|---|---|
Use Scenario: Real-time fader control in analog summing buses with remote MCU supervision. IC Role / Device Role / Timing Role: Primary stereo volume controller managing analog signal path gain before ADC or power amp stages. Use Value: Zero-crossing detection prevents click/pop during live mix adjustments; −130 dBFS crosstalk preserves channel separation in dense multitrack environments. |
Use Scenario: Master monitor output level setting in OB van or control room with redundant digital control. IC Role / Device Role / Timing Role: Final analog gain stage before broadcast transmission chain or headphone distribution. Use Value: 120-dB dynamic range accommodates wide-program-content peaks; daisy-chaining simplifies integration with multiple source inputs. |
| High-End A/V Receiver | Car Audio DSP Head Unit |
Use Scenario: Preamp-level volume control in multi-zone home theater systems with HDMI/ARC audio routing. IC Role / Device Role / Timing Role: Stereo analog volume block interfacing between DAC output and analog preamp stage. Use Value: ±5-V analog supplies deliver clean headroom for 24-bit audio; 0.0004% THD+N meets THX Ultra2 fidelity thresholds. |
Use Scenario: Channel-specific gain trimming in automotive infotainment units with CAN-controlled DSP firmware. IC Role / Device Role / Timing Role: Analog gain element in feedback loop of digital signal processor output stage. Use Value: SOIC-16 footprint fits compact automotive PCBs; 660-Ω direct drive reduces BOM count vs. discrete buffer solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stereo analog volume control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PGA2311UA | A-grade variant with 0.0002% THD+N (vs. U-grade's 0.0004%) and tighter voltage range specification (VA− +1.25 V to VA+ −1.25 V). | Used where ultra-low distortion is mandatory (e.g., mastering studio monitors), not required for general consumer A/V. | Select PGA2311UA only if THD+N < 0.0003% is validated in final system testing; otherwise PGA2311U offers identical functionality at lower cost. |
| CS3310-KS | Crystal Semiconductor part; pin- and software-compatible per TI documentation, but uses different resistor ladder topology and lacks daisy-chain SDO output. | Legacy designs migrating from CS3310 may retain PCB layout but lose multi-device serial control capability. | PGA2311U supports daisy-chaining and has superior crosstalk (−130 dBFS vs. −110 dBFS); choose CS3310-KS only for drop-in replacement in existing CS3310 layouts. |
Compared with PGA2311UA, the PGA2311U trades marginal THD+N degradation for broader availability and lower unit cost, while retaining identical pinout, serial protocol, and daisy-chain capability; versus CS3310-KS, it adds SDO-driven cascading and improves crosstalk by 20 dB - making it preferable for new designs requiring scalability or high channel isolation.
Availability
PGA2311U is available at Aetrix Electronics and suitable for professional audio amplifiers, broadcast studio equipment, and high-end A/V receivers requiring stable component supply, long-term production continuity, and RoHS-compliant SOIC packaging.
Supply support for PGA2311U 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies - with over 50 years of innovation in precision signal chain components.
The PGA2311U belongs to TI's high-fidelity audio analog volume control product line, engineered specifically for professional and premium consumer audio systems demanding low distortion, high channel separation, and robust digital control.
FAQ
What is the exact package type and footprint for PGA2311U?
The PGA2311U uses a 16-pin SOIC (DW) package with body dimensions of 7.5 mm × 10.30 mm and standard 1.27-mm lead pitch. It is RoHS-compliant, rated MSL Level-2 (260°C, 1 year), and designed for reflow soldering. The pinout matches TI's documented SOIC-16 layout - no adapter or footprint modification is needed when replacing PGA2311U/1K.B or PGA2311UA variants.
Does PGA2311U support daisy-chaining with other PGA2311 devices?
Yes, PGA2311U supports daisy-chaining via its SDO (pin 7) output connected to the SDI (pin 3) input of the next device. Each PGA2311U in the chain receives 16 bits (8 per channel) in sequence, forming a 16×N-bit shift register. The CS signal must remain LOW for the full duration - 16×N SCLK cycles - to load all devices correctly.
What is the guaranteed THD+N performance of PGA2311U at 1 kHz?
The PGA2311U (U-grade) guarantees 0.0004% THD+N at 1 kHz with 2 Vrms input, as specified in the Electrical Characteristics table (SBOS218D Rev D). This value is measured under standard conditions: TA = +25°C, VA+ = +5 V, VA− = −5 V, VD+ = +5 V, RL = 100 kΩ, and BW = 10 Hz–20 kHz.
How does the zero-crossing detection function work in PGA2311U?
In PGA2311U, zero-crossing detection is enabled by asserting ZCEN (pin 1) HIGH. When a new gain code is written, the change is held pending either a positive-slope zero crossing of the input signal or a 16-ms timeout. If the timeout expires first, the gain change occurs immediately - ensuring deterministic behavior even with DC or low-frequency signals.
Can PGA2311U operate with asymmetric analog supply voltages?
No - PGA2311U requires symmetrical ±5-V analog supplies (VA+ = +5 V, VA− = −5 V) per Recommended Operating Conditions. The absolute maximum ratings allow ±5.25 V, but gain accuracy, THD+N, and output swing specifications are validated only within the ±4.75 V to ±5.25 V range with symmetry maintained. Asymmetric rails degrade common-mode rejection and increase distortion.
PGA2311U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Volume Control
- Applications:
- Audio, Musical Instruments
- Number of Channels:
- 2
- Interface:
- SPI
- Voltage - Supply:
- ±4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Specifications:
- 31.5dB ~ -95.5dB
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
PGA2311U FAQ
1.How can I place an order for PGA2311U through Aetrix?
Please submit a Request for Quotation (RFQ) for PGA2311U 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 PGA2311U reliable?
The price and inventory of PGA2311U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PGA2311U is usually 5 days.
3.What payment methods are accepted for PGA2311U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PGA2311U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PGA2311U?
PGA2311U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PGA2311U 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 PGA2311U?
For technical support, including PGA2311U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PGA2311U requirements.
6.How does Aetrix verify that PGA2311U is sourced from the original manufacturer or authorized distributors?
All PGA2311U 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 PGA2311U meets industry standards.
7.What is the process for return or replacement of PGA2311U?
All PGA2311U units undergo pre-shipment inspection (PSI). If there is an issue with PGA2311U, 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 PGA2311U part is unused and in its original packaging.
Return procedure for PGA2311U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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