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PGA2505 - Digitally Controlled Microphone Preamplifier

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

Texas 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.

PGA2505 Datasheet
Texas Instruments PGA2505 - Digitally Controlled Microphone Preamplifier
  • Overview
  • Features & Applications
  • Diagram
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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.

  • 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

RoHS Compliant


Texas Instruments PGA2505 Diagram

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Texas Instruments
Part Number
Part Number
Output Type
Voltage - Supply
Class AB
1-Channel (Mono)
±4.75 ~ 5.25V