Texas Instruments PGA2320IDWR

Overview

PGA2320IDWR from Texas Instruments is a stereo analog volume control IC with independent left/right channels, serial 3-wire interface (CS/SDI/SCLK), zero-crossing detection, and mute function. It delivers +31.5dB to −95.5dB gain in 0.5dB steps, 120dB dynamic range, and −126dBFS interchannel crosstalk, targeting high-fidelity audio signal routing in mixing consoles and broadcast equipment.

For engineers reviewing the PGA2320IDWR datasheet, PGA2320IDWR pinout, PGA2320IDWR application, or PGA2320IDWR equivalent, key selection criteria include its ±15V analog supply capability, 0.0003% THD+N at 1kHz, SOIC-16 package layout separation for analog/digital grounds, and daisy-chain support for multi-device volume control systems.

Technical Context

The PGA2320IDWR uses a precision resistor network and bipolar op-amp output stage fabricated in BiCMOS, enabling direct 600Ω load driving without external buffering. Its gain is set via 8-bit per-channel straight-binary codes, with mute triggered either by MUTE pin (active-low) or gain byte = 00HEX.

Zero crossing detection (enabled via ZCEN pin) ensures noise-free level transitions by latching new gain settings only after two input zero crossings-or timing out after 16ms. The serial interface supports daisy-chaining up to N devices using a 16×N-bit shift register configuration with shared CS/SCLK/SDI and cascaded SDO-to-SDI connections.

Key Specifications

Pinout & Package

PGA2320IDWR is housed in a 16-pin SOIC (DW) package with 1.27mm pitch, 7.5mm × 10.3mm body, and 2.65mm max height. Analog (pins 9–16) and digital (pins 1–8) sections are physically segregated to minimize coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PGA2320IDWR, PGA2310IDW omits zero-crossing control-requiring software-managed timing for clean transitions-while PGA2311IDW enhances muting behavior and distortion performance but increases BOM cost; PGA2320IDWR remains optimal for professional gear needing hardware-gated zero-crossing assurance.

Availability

PGA2320IDWR is available at Aetrix Electronics and suitable for audio amplifiers, mixing consoles, broadcast studio equipment, and car audio systems requiring stable component supply and long-term industrial lifecycle support.

Supply support for PGA2320IDWR 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 high-performance signal chain solutions.

The PGA2320IDWR belongs to TI's Precision Audio Amplifier & Volume Control product line, engineered specifically for professional audio infrastructure demanding ultra-low distortion, high channel separation, and robust analog signal integrity.

FAQ

What is the absolute maximum analog supply voltage for PGA2320IDWR?

The absolute maximum analog supply voltage for PGA2320IDWR is +15.5V on VA+ and −15.5V on VA−. Operation beyond these limits risks permanent device damage. The recommended operating range is ±15V, which enables full +31.5dB to −95.5dB gain control while preserving 120dB dynamic range and 0.0003% THD+N performance. Always use proper decoupling (10µF + 0.1µF per rail) close to pins 12 and 13.

Does PGA2320IDWR support daisy-chaining, and how many devices can be linked?

Yes, PGA2320IDWR supports daisy-chaining via its SDO output connected to the SDI input of the next device. Each PGA2320IDWR contributes 16 bits (8 left + 8 right) to the serial shift register, so N devices require a 16×N-bit command frame. The CS pin must remain low for the full duration-e.g., 48 cycles for three devices. This architecture reduces MCU pin count and simplifies control of multi-channel audio systems without additional address decoding logic.

How does the zero-crossing detection function work in PGA2320IDWR?

In PGA2320IDWR, zero-crossing detection is enabled by asserting ZCEN (pin 1) high. When a new gain setting is written, the device waits for two zero crossings on the affected channel's input before applying the change-eliminating audible clicks. If no zero crossings occur within 16ms, it times out and applies the gain unconditionally. This hardware-based timing ensures deterministic, artifact-free level transitions critical in live sound reinforcement and broadcast applications where software timing cannot guarantee sample-accurate synchronization.

Can PGA2320IDWR drive a 600Ω load directly, and what are the implications?

Yes, PGA2320IDWR can drive a 600Ω load directly using its integrated bipolar op-amp output stage-no external buffer is needed. However, THD+N degrades above 600Ω source impedance; the datasheet specifies ≤600Ω for 0.0003% THD+N at 1kHz. Driving heavier loads (e.g., 10kΩ) is supported with improved distortion, but 600Ω compatibility makes PGA2320IDWR suitable for professional line-level interfacing per EBU R68 and SMPTE RP188 standards without added components.

What is the power-up state of PGA2320IDWR, and how is it initialized?

On power-up, PGA2320IDWR resets all internal flip-flops and sets both left and right channel gain bytes to 00HEX-activating mute for both channels. The device remains muted until the host controller writes valid 8-bit gain values via the serial interface. This fail-safe state prevents loudspeaker thumps or uncontrolled signal pass-through during system boot. Initialization requires a 16-bit write (e.g., 0x8080 for 0dB on both channels) with CS low and SCLK toggling; no external reset pin is provided.