Texas Instruments PGA2310UA/1K

Overview

PGA2310UA/1K from Texas Instruments is a stereo analog audio volume controller IC with independent left/right channel gain control via 3-wire serial interface, ±15-V analog supply support, 0.5-dB step resolution (31.5 dB to −95.5 dB), and zero-crossing–enabled noise-free level transitions-used in broadcast mixing consoles and high-end A/V receivers.

For engineers reviewing the PGA2310UA/1K datasheet, PGA2310UA/1K pinout, PGA2310UA/1K application, or PGA2310UA/1K equivalent, this page delivers verified functional identity, SOIC-16 package mapping, confirmed 16-pin analog/digital partitioning, real-world crosstalk (−126 dBFS) and THD+N (0.0004% at 1 kHz) specs, and two validated alternative volume controllers for professional audio signal chains.

Technical Context

The PGA2310UA/1K implements digitally programmable analog gain using a precision resistor ladder and bipolar op-amp output stage per channel, enabling direct 600-Ω load driving without external buffering. Its serial control port operates at up to 6.25 MHz with MSB-first 16-bit word format (8 bits per channel), supporting daisy-chaining of multiple devices via SDO-to-SDI cascading.

Zero crossing detection (ZCEN pin) and hardware mute (MUTE pin) operate independently per channel, with gain updates synchronized to input signal zero crossings or time-out (16 ms). The device partitions pins physically and electrically: digital signals (CS, SCLK, SDI, SDO, ZCEN, MUTE, VD+, DGND) occupy pins 1–8; analog signals (VINL/VOUTL/AGNDL/VA+/VA−/VINR/VOUTR/AGNDR) occupy pins 9–16.

Key Specifications

Pinout & Package

PGA2310UA/1K uses a 16-pin SOIC (DW) package (7.50 mm × 10.30 mm), with physical separation of analog (pins 9–16) and digital (pins 1–8) sections to minimize coupling. Pin 1 (ZCEN) is top-left corner when notch is oriented up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PGA2311UA/1K, PGA2310UA/1K omits DAC-based analog control-reducing BOM count and cost while retaining identical serial control fidelity. Against CS3310-KS, PGA2310UA/1K delivers 15× wider gain range, 0.5-dB resolution, and ±15 V operation essential for professional signal integrity.

Availability

PGA2310UA/1K is available at Aetrix Electronics and suitable for broadcast studio equipment, high-end A/V receivers, and professional audio effects processors requiring stable component supply across extended production lifecycles.

Supply support for PGA2310UA/1K 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 and embedded processing technologies, with decades of expertise in high-fidelity audio signal conditioning.

The PGA2310 product line was designed specifically for professional audio infrastructure-delivering precision analog gain control with digital programmability, zero-crossing switching, and robust ±15 V operation for studio, broadcast, and live sound applications.

FAQ

What is the absolute maximum analog supply voltage rating for PGA2310UA/1K?

The PGA2310UA/1K has an absolute maximum analog supply rating of VA+ = +16 V and VA− = −16 V. Operation beyond these limits risks permanent damage. The recommended operating range is ±4.5 V to ±15.5 V, with nominal ±15 V used for full 27 VPP signal swing. Always observe derating guidelines in Section 6.1 of the SBOS207C datasheet when designing thermal and voltage margins for PGA2310UA/1K.

Does PGA2310UA/1K support daisy-chaining, and how many devices can be cascaded?

Yes, PGA2310UA/1K supports daisy-chaining via its SDO output connected to the SDI input of the next device. Each PGA2310UA/1K consumes 16 bits in the shift register, so N devices require a 16×N-bit serial word and CS low for 16×N SCLK cycles. There is no hard limit on cascade length, but timing budgets (e.g., tCSCR, tCFCS) and signal integrity degrade beyond ~8 devices without buffering-verified in TI's SBOU012 EVM documentation for PGA2310UA/1K.

How does zero crossing detection work on PGA2310UA/1K, and what happens if no zero crossing occurs?

When ZCEN is high, PGA2310UA/1K delays new gain application until two zero crossings are detected on the affected channel-or until a 16 ms timeout expires. If no zero crossing occurs within that window, the gain change executes unconditionally, potentially causing an audible pop. This behavior is documented in Section 7.3.5 of SBOS207C and applies independently per channel, ensuring mute or gain updates never stall system responsiveness.

Can PGA2310UA/1K drive a 600-Ω load directly, and what is the impact on THD+N?

Yes, PGA2310UA/1K's bipolar op-amp output stage is specified to drive 600-Ω loads directly without external buffering. At 1 kHz and 3 VRMS output into 600 Ω, THD+N remains ≤0.001% (per Section 6.5), though optimal performance (0.0004%) is achieved at 100 kΩ. Driving 600 Ω increases output current demand but stays within 35 mA short-circuit limit-confirmed in Figure 6 of SBOS207C for PGA2310UA/1K.

What is the function of the MUTE pin on PGA2310UA/1K, and how does it interact with serial gain commands?

The MUTE pin (pin 8) is an active-low hardware override that forces both channels to analog ground (AGNDL/AGNDR) regardless of serial gain settings. When asserted, mute takes effect after the next zero crossing or 16 ms timeout-matching ZCEN behavior. It operates independently of CS or serial activity, providing fail-safe silencing. PGA2310UA/1K retains mute state even if serial communication fails, making it critical for safety-critical audio routing.