PGA2500IDBG4

The PGA2500IDBG4 is a digitally controlled analog Microphone Preamplifier designed for use as a front end for high performance audio analog-to-digital (A/D) converters. The PGA2500 features include low noise, wide dynamic range and a differential signal path. An on-chip DC servo loop is employed to minimize DC offset, while a common-mode servo function may be used to enhance common-mode rejection. The PGA2500 features a gain range of 10dB through 65dB (1dB/step), along with unity gain setting. The wide gain range allows the PGA2500 to be used with a variety of microphones. Gain settings and internal functions are programmed using a 16-bit control word, which is loaded using a simple serial port interface. A serial data output pin provides support for daisy-chained connection of multiple PGA2500 devices. Four programmable digital outputs are provided for controlling the external switching of input pads, phantom power, high pass filters and polarity reversal functions.

• Fully differential input-to-output architecture
• Digitally controlled gain using serial port interface
• Zero crossing detection minimizes audible artifacts when gain switching
• Integrated DC servo minimizes output offset voltage
• Common-mode servo improves CMRR
• Four-wire serial control port interface
• Dedicated input pin for selecting unity gain
• Overload output pin provides clipping indication
• Four general-purpose digital output pins
• Requires ±5V power supplies
• Green product and no Sb/Br