Digitally-Controlled Microphone Preamplifier (Rev. B) - Texas Instruments Semiconductor - #1

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PGA2505 Burr-Brown Audio ™ Digitally-Controlled 1FEATURES APPLICATIONS DESCRIPTION PGA2505 www.ti.com ........................................................................................................................................................ SBOS396B–MARCH 2009–REVISED JUNE 2009 MICROPHONE PREAMPLIFIER · MICROPHONE PREAMPLIFIERS AND MIXERS 234· FULLY DIFFERENTIAL lNPUT-TO-OUTPUT ARCHITECTURE · DIGITAL MIXERS AND RECORDERS · DIGITALLY-CONTROLLED GAIN USING SPI™: · DIGITAL AUDIO EDITING SYSTEMS – Gain Range: 9dB through 60dB, · BROADCAST EQUIPMENT 3dB per Step · INTERCOMS – Unity (0dB) Gain Setting via Serial Port · DYNAMIC PERFORMANCE: – Equivalent Input Noise with ZS = 150Ù The PGA2505 is a digitally-controlled, analog and Gain = 30dB: –123dBu microphone preamplifier designed for use as a 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 · ZERO CROSSING DETECTION MINIMIZES signal path. An on-chip dc servo loop is employed to AUDIBLE ARTIFACTS WHEN GAIN minimize dc offset, while a common-mode servo SWITCHING function may be used to enhance common-mode rejection.SoundPlus™ · INTEGRATED DC SERVO MINIMIZES OUTPUT OFFSET VOLTAGE The PGA2505 features a gain range of 9dB through · COMMON-MODE SERVO IMPROVES CMRR 60dB (3dB/step), along with a unity gain setting. The 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 – Simple Interface to Microprocessor word, which is loaded using a simple serial port or DSP Serial Ports interface. A serial data output pin provides support for – Supports Daisy-Chaining of Multiple daisy-chained connection of multiple PGA2505 PGA2505 Devices devices. Four programmable digital outputs are 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 · FOUR GENERAL-PURPOSE and is available in a small SSOP-24 package. 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. 2SoundPlus is a trademark of Texas Instruments Incorporated. 3SPI is a trademark of Motorola, Inc.. 4All 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.