Texas Instruments PGA2311P

Overview

PGA2311P from Texas Instruments is a stereo analog audio volume controller IC with independent left/right channel gain control, 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 supports 0.5-dB step resolution across +31.5 dB to −95.5 dB range - used in professional mixing consoles and high-end A/V receivers.

For engineers reviewing the PGA2311P datasheet, PGA2311P pinout, PGA2311P application, or PGA2311P equivalent, key selection considerations include its dual-channel analog gain architecture, PDIP-16 package compatibility, A-grade vs U-grade THD+N performance (0.0002% vs 0.0004%), and daisy-chainable serial interface for multi-device volume control systems.

Technical Context

The PGA2311P implements digitally controlled analog attenuation using a precision resistor ladder and analog switch array per channel, followed by a low-noise op-amp output stage capable of driving 660-Ω loads directly. Gain is set via 8-bit straight-binary codes (R[7:0]/L[7:0]) with mute (N=0) and full-scale (+31.5 dB at N=255) states.

Its serial interface operates up to 6.25 MHz with MSB-first timing, supports hardware muting (MUTE pin), zero-crossing–enabled gain updates (ZCEN), and daisy-chaining via SDO-to-SDI cascading - requiring CS low for 16×N clock cycles where N is the number of chained devices.

Key Specifications

Pinout & Package

PGA2311P is supplied in a 16-pin plastic dual in-line package (PDIP-N), 6.35 mm × 19.30 mm body size, with through-hole mounting and industry-standard lead pitch. Pin 1 is marked with a notch or dot; pins are numbered counter-clockwise from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo analog volume control applications.

Compared with PGA2311U and CS3310-KS, the PGA2311P provides superior thermal performance in through-hole layouts (RθJA = 39.9°C/W), guaranteed long-term availability from Texas Instruments, and documented A-grade THD+N validation - making it the recommended choice for new industrial and broadcast designs requiring reliability and serviceability.

Availability

PGA2311P 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-lifecycle assurance, and traceable sourcing.

Supply support for PGA2311P 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 90 years of innovation in precision signal chain components.

The PGA2311P belongs to TI's professional audio analog volume controller product line, engineered specifically for low-noise, high-dynamic-range stereo signal path control in broadcast, studio, and premium consumer audio systems.

FAQ

What is the maximum analog input voltage the PGA2311P can accept without clipping?

The PGA2311P accepts analog input signals up to (VA−)+1.25 V and (VA+)-1.25 V. With ±5-V supplies, this yields a maximum input swing of ±3.75 V (7.5 Vpp). Exceeding this range causes hard clipping at the internal resistor network, degrading THD+N and dynamic range. The PGA2311P datasheet specifies 2.5 Vrms as the maximum unclipped input level under typical conditions.

Does the PGA2311P support daisy-chaining, and how many devices can be cascaded?

Yes, the PGA2311P supports daisy-chaining via its SDO-to-SDI connection. Each device adds 16 bits to the serial shift register, so N devices require a 16×N-bit command word and CS low for 16×N SCLK cycles. There is no hard limit on N, but timing margins, signal integrity, and SCLK frequency (≤6.25 MHz) constrain practical implementations to ≤8 devices on a single bus without repeaters.

What is the difference between PGA2311P and PGA2311PA?

The PGA2311P is the U-grade version with 0.0004% THD+N at 1 kHz, while PGA2311PA is the A-grade variant achieving 0.0002% THD+N - verified in production testing. Both share identical pinout, package (PDIP-16), gain range, and interface protocol. The A-grade part targets broadcast and mastering applications where ultra-low distortion is mandatory.

How does the zero-crossing detection function work in the PGA2311P?

The PGA2311P monitors the analog input signal for zero crossings on each channel. When ZCEN is high and a new gain code is loaded, the update is held until either a positive-slope zero crossing occurs or a 16-ms timeout expires. This prevents transient glitches during volume changes. The PGA2311P implements this entirely in analog circuitry - no external zero-crossing detector is needed.

Can the PGA2311P operate with asymmetric analog supply voltages, such as +5 V and −3.3 V?

No. The PGA2311P requires symmetrical ±5-V analog supplies (±4.75 V to ±5.25 V) as specified in the Recommended Operating Conditions table. Asymmetric rails violate the internal biasing of the op-amp and resistor network, causing gain error, increased THD+N, and potential output saturation. The PGA2311P voltage range specification explicitly references (VA−)+1.25 V and (VA+)-1.25 V - confirming strict symmetry dependency.