PGA2505

Burr-BrownAudio

™ Digitally-Controlled

1

FEATURES

APPLICATIONS

DESCRIPTION

PGA2505

MICROPHONE PREAMPLIFIER

• MICROPHONE PREAMPLIFIERS AND MIXERS

234

• FULLY DIFFERENTIAL lNPUT-TO-OUTPUT

ARCHITECTURE

• DIGITAL MIXERS AND RECORDERS

• DIGITAL AUDIO EDITING SYSTEMS

• DIGITALLY-CONTROLLED GAIN USING SPI™:

• BROADCAST EQUIPMENT

–

Gain Range: 9dB through 60dB,

• INTERCOMS

3dB per Step

–

Unity (0dB) Gain Setting via Serial Port

• DYNAMIC PERFORMANCE:

The

PGA2505

is

a

digitally-controlled,

analog

–

microphone preamplifier designed for use as a

and Gain = 30dB: –123dBu

front-end for high-performance audio analog-to-digital

–

Total Harmonic Distortion plus Noise

converters (ADCs). The PGA2505 features include

(THD+N) with Gain = 30dB: 0.0006%

low noise, wide dynamic range, and a differential

signal path. An on-chip dc servo loop is employed to

• ZERO CROSSING DETECTION MINIMIZES

minimize dc offset, while a common-mode servo

AUDIBLE ARTIFACTS WHEN GAIN

function may be used to enhance common-mode

SWITCHING

• INTEGRATED DC SERVO MINIMIZES

The PGA2505 features a gain range of 9dB through

OUTPUT OFFSET VOLTAGE

60dB (3dB/step), along with a unity gain setting. The

• COMMON-MODE SERVO IMPROVES CMRR

wide gain range allows the PGA2505 to be used with

• FOUR-WIRE SERIAL CONTROL PORT

a variety of microphones. Gain settings and internal

INTERFACE:

functions are programmed using a 16-bit control

word, which is loaded using a simple serial port

–

Simple Interface to Microprocessor

interface. A serial data output pin provides support for

or DSP Serial Ports

daisy-chained

connection

of

multiple

PGA2505

–

Supports Daisy-Chaining of Multiple

devices. Four programmable digital outputs are

PGA2505 Devices

provided for controlling the external switching of input

• OVER-RANGE OUTPUT PIN PROVIDES

pads, phantom power, and high-pass filters. The

CLIPPING INDICATION

PGA2505 requires both +5V and –5V power supplies

and is available in a small SSOP-24 package.

• FOUR GENERAL-PURPOSE

DIGITAL OUTPUT PINS

• ±5V POWER SUPPLIES

• AVAILABLE IN AN SSOP-24 PACKAGE

1

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.

2

SoundPlus is a trademark of Texas Instruments Incorporated.

3

SPI is a trademark of Motorola, Inc..

4

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.