PGA4311U.pdf
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The PGA4311U is a high-performance, digitally controlled analog volume control IC intended for premium audio paths. It offers four independent channels with programmable gain from +31.5 dB down to −95.5 dB in 0.5 dB steps, allowing very fine control of stereo or multi-channel levels.
Each channel includes an internal high-quality audio op amp that can drive 600–660 Ω loads directly, eliminating the need for external buffers in many designs. Separate analog and digital supplies help isolate noise and maintain signal integrity, making the device suitable for mastering-grade equipment.
With its SPI interface, zero-cross detection option and compact SOIC-28 package, the PGA4311U simplifies the design of digital mixers, pre-amplifiers, DAC output stages and other audio products where both sound quality and precise channel matching are essential.
Low THD+N and wide dynamic range keep the original signal character intact, so the volume control stage does not become the weak link in a high-fidelity signal chain.
0.5 dB gain steps across a wide adjustment range allow accurate channel matching, scene recall and remote control via SPI, ideal for digitally managed systems.
Integrated amplifiers can directly drive low-impedance loads such as 600 Ω lines or headphone stages in many applications, reducing external component count and board space.
Separate analog and digital supplies, configurable zero-cross detection and standard SPI timing make it easy to integrate the PGA4311U with DSPs, Microcontrollers or control FPGAs.
Four fully independent channels support stereo, 2.1 or surround-preamp architectures, all controlled by a single SPI interface.
Gain adjustable from approximately +31.5 dB to −95.5 dB with 0.5 dB steps, enabling coarse trim, fine calibration and full mute control in one device.
Optional zero-cross detection can be enabled so level changes occur near signal zero crossings, helping to minimize audible clicks and pops when adjusting volume.
| Parameter | Value / Condition |
|---|---|
| Function | Digitally controlled 4-channel audio volume control |
| Gain Range | +31.5 dB to −95.5 dB (0.5 dB steps) |
| Control Interface | SPI serial interface (SDI, SDO, SCLK, CS) |
| Load Drive Capability | Capable of driving ≈600–660 Ω loads directly |
| Analog Supply | Typically ±5 V analog rails for maximum headroom |
| Digital Supply | Separate low-voltage digital supply for logic and SPI |
| Package | SOIC-28 (PGA4311U) |
The following Texas Instruments parts belong to the same PGA4311 family or are packaging variants commonly considered when selecting or replacing PGA4311U in audio designs:
These devices are generally functionally compatible but may differ in package markings, lead finish or shipment form. Always confirm electrical limits and pinout details from the official TI datasheet before using them as direct replacements.
Texas Instruments (TI) is a leading analog and mixed-signal semiconductor supplier. TI audio solutions cover converters, amplifiers, codecs and specialized audio control ICs that are widely deployed in studio gear, broadcast systems, automotive infotainment and high-end consumer audio products. The PGA4311 family leverages TI's long experience in precision analog design to deliver reliable, repeatable performance over many years of product life.
Used for digitally controlled channel faders and master output level control while preserving low noise and low distortion across multiple channels.
Provides multi-channel volume adjustment in home theater pre-processors, AVRs and surround controllers with precise level matching between channels.
Acts as the analog volume stage after high-resolution DACs, driving line-level outputs or headphone amplifiers with minimal coloration.
Used in routing matrices, monitor controllers and dynamics processors where remote-controlled, repeatable volume settings are required for critical listening environments.
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Our experienced QC team strictly verifies and tests PGA4311U. Only qualified suppliers who pass our audit can list PGA4311U on OEM STOCK GLOBAL LIMITED. We pay close attention to sourcing channels and product quality so you can purchase with confidence.
Pricing and inventory for PGA4311U fluctuate and are updated periodically (typically within 24 hours). Quotations generally remain valid for 5 days unless otherwise stated.
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We perform Pre-Shipment Inspection (PSI) on randomly selected units before shipping. If there is an issue with PGA4311U, returns/replacements are accepted when:
Steps: (1) Inform us within 90 days; (2) Obtain Return Authorization (RMA) before sending items back.
Please contact us for technical documents and support related to Texas Instruments PGA4311U, including pin diagrams and datasheets. Our team will respond promptly.
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