The PGA2500 is a digitally controlled, analog microphone preamplifier designed for use as a front end for high-performance audio analog-to-digital converters (ADCs). The PGA2500 features include low noise, wide dynamic range, and a differential signal path.
The PGA2500 is a digitally controlled, fully differential microphone preamplifier IC designed for use with high‑performance audio ADCs. It provides a programmable gain range of 10 dB to 65 dB in 1 dB steps, low equivalent input noise (‑128 dBu at 30 dB gain) and very low THD+N (0.0004 % at 30 dB gain). Gain and functions are set via a 16‑bit control word over a four‑wire serial interface, with optional daisy‑chaining of multiple devices.
The device includes on‑chip DC‑servo and common‑mode servo loops to minimize output offset and improve CMRR, four programmable digital outputs for external control, and an overload indicator pin. It operates from ±5 V supplies, is offered in an SSOP‑28 package, and is suited for microphone preamplifier, mixer, and digital recorder applications.
| Gain range | 10 dB to 65 dB, 1 dB step |
|---|---|
| Equivalent Input Noise (EIN) at 30 dB gain | -128 dBu |
| THD+N at 30 dB gain | 0.0004 % |
| Quiescent current (VA+) | 30‑40 mA |
| Input resistance per pin | 4.6 kΩ |
The PGA2500 provides a gain range of 10 dB to 65 dB with 1 dB steps.
Gain is programmed with a 16‑bit control word sent over a four‑wire serial port interface.
Yes, the OVR pin provides an active‑high output when the preamplifier output exceeds a programmed threshold.