The PGA2320 is a high-performance, stereo audio volume control designed for professional and high-end consumer audio systems. The ability to operate from ±15V analog power supplies enables the PGA2320 to process input signals with large voltage swings, thereby preserving the dynamic range available in the overall signal path. Using high performance operational amplifier stages internal to the PGA2320 yields low noise and distortion, while providing the capability to drive 600Ω loads directly without buffering. The three-wire serial control interface allows for connection to a wide variety of host controllers, in addition to support for daisy-chaining of multiple PGA2320 devices.
The PGA2320 is a high‑performance, stereo audio volume control IC designed for professional and high‑end consumer audio equipment. It operates from ±15 V analog supplies and a +5 V digital supply, providing a wide gain range, low noise, and the ability to drive 600 Ω loads directly.
The device is programmed via a three‑wire serial control port that supports daisy‑chaining of multiple ICs. Features include zero‑crossing detection for noise‑free level transitions, a gain step size of 0.5 dB, and a dynamic range of 120 dB. The datasheet provides electrical characteristics, pin assignments, timing diagrams, and mechanical package information.
| Gain range | +31.5 dB to –95.5 dB |
|---|---|
| Gain step size | 0.5 dB |
| Dynamic range | 120 dB |
| THD+N (1 kHz) | 0.0003 % |
| Inter‑channel crosstalk | −126 dBFS |
| Input resistance | 12 kΩ |
| Maximum serial clock frequency | 6.25 MHz |
| Short‑circuit current | 75 mA |
The PGA2320 provides a gain range from +31.5 dB down to –95.5 dB with 0.5 dB steps.
Yes, the serial interface supports daisy‑chaining of multiple devices, allowing a single three‑wire bus to program all devices in the chain.
When ZCEN is high, the device delays gain changes until a zero crossing is detected, providing noise‑free level transitions.