Texas Instruments PGA2500 Data Sheet/Manual
Summary
This digitally controlled preamplifier acts as a high-performance audio front-end for professional microphone systems and ADCs. Featuring fully differential input-to-output architecture, the PGA2500 provides low noise, wide dynamic range, and precise digital gain control from 10dB to 65dB. This manual serves as a technical guide detailing its operational specifications, DC/Common-Mode servo functions, and four-wire serial interface options. It is designed for audio engineers building robust recording equipment, mixers, and high-fidelity data acquisition systems.
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PGA2500
SBOS289A − NOVEMBER 2003 − REVISED DECEMBER 2003
Digitally Controlled Microphone Preamplifier
FEATURES APPLICATIONS Fully Differential Input-to-Output Architecture Microphone Preamplifiers and Mixers Digitally Controlled Gain Using Serial Port Digital Mixers and Recorders Interface: − Gain Range: 10d B through 65d B, 1d B per
DESCRIPTION
The PGA2500 is a digitally controlled, analog microphone
− Unity (0d B) Gain Setting via Serial Port or
preamplifier designed for use as a front end for high-
Dedicated Control Pin
performance audio analog-to-digital converters (ADCs). The
Dynamic Performance: PGA2500 features include low noise, wide dynamic range, − Equivalent Input Noise with ZS = 150Ω and and a differential signal path. An on-chip DC servo loop is Gain = 30d B: −128d Bu employed to minimize DC offset, while a common-mode
− Total Harmonic Distortion plus Noise servo function may be used to enhance common-mode (THD+N) with Gain = 30d B: 0.0004% rejection.
Zero Crossing Detection Minimizes Audible
The PGA2500 features a gain range of 10d B through 65d B
Artifacts when Gain Switching
(1d B/step), along with a unity gain setting. The wide gain
Integrated DC Servo Minimizes Output Offset range allows the PGA2500 to be used with a variety of Voltage microphones. Gain settings and internal functions are
Common-Mode Servo Improves CMRR programmed using a 16-bit control word, which is loaded using a simple serial port interface. A serial data output pin
Four-Wire Serial Control Port Interface:
provides support for daisy-chained connection of multiple
− Simple Interface to Microprocessor or
PGA2500 devices. Four programmable digital outputs are
DSP Serial Ports
provided for controlling the external switching of input pads,
− Supports Daisy-Chaining of Multiple
phantom power, high pass filters, and polarity reversal
PGA2500 Devices
functions. The PGA2500 requires both +5V and −5V power
Dedicated Input Pin for Selecting Unity Gain
supplies and is available in a small SSOP-28 package.
Overload Output Pin Provides Clipping Indication Four General-Purpose Digital Output Pins Requires ±5V Power Supplies Available in an SSOP-28 Package
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners.
Copyright 2003, Texas Instruments Incorporated
www.ti.com
Page Summary Contents For Texas Instruments PGA2500 Data Sheet/Manual
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 17 |
| File Size | 194.07 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What is the required power supply for the PGA2500?
It requires both +5V and -5V supplies.
How can the gain be adjusted on this device?
The gain range is 10dB through 65dB, with adjustment done in 1dB steps using a serial port interface.
Can multiple PGA2500 devices be connected together?
Yes, it supports daisy-chaining via a simple serial data output pin for multiple devices.
What is the minimum and maximum operating temperature range?
The operating temperature range is from -40°C to +85°C.