PGA2505 - Digitally Controlled Microphone Preamplifier

Low Noise, Wide Dynamic Range, and Differential Signal Path - Now Available at Digi-Key

PGA2505 - Digitally Controlled Microphone PreamplifierTexas Instruments' PGA2505 is a lower performance/lower cost follow-on device to the existing PGA2500 digitally controlled, analog microphone preamplifier IC, designed for use as a front end for high performance audio analog to digital converters (ADC's). The PGA2505 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.

Overview

The PGA2505 features a gain range of 9dB through 60dB (3dB/step), along with a unity gain setting. The wide gain range allows the PGA2505 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 PGA2505 devices. Four programmable digital outputs are provided for controlling the external switching of input pads, phantom power, high pass filters, and polarity reversal functions. The PGA2505 requires both +5V and -5V power supplies and is available in a small SSOP-24 package.

Diagram

Features Applications
  • Programmable gain:
    • 9dB to 60dB in 3dB steps
    • Unity gain (0dB) setting via serial port
  • Fully differential I/O
  • Low noise architecture
    • Equivalent input noise = -123dBu
    • THD+N = 0.0006% (gain = 30dB)
  • Four general purpose outputs
  • Zero crossing detection minimizes audible artifacts
    when gain switching
  • Microphone preamplifiers
  • Digital audio mixers
  • Digital audio recorders
  • Broadcast equipment
  • Studio equipment
  • Musical instruments

Digitally Controlled Microphone Preamplifier

ImageManufacturer Part NumberDescriptionTypeOutput TypeAvailable Quantity
PGA2505IDB datasheet linkIC DGTL CTRLR MICOPHN AMP 24SSOPPGA2505IDBIC DGTL CTRLR MICOPHN AMP 24SSOPClass AB1-Channel (Mono)2205 - Immediate
PGA2505IDB product page link
Published: 2009-06-25