PGA2505

PGA2505 PGA2505 Burr-Brown Audio www.ti.com ......................................................................................................................................................... SBOS396B – MARCH 2009 – REVISED JUNE 2009 ™ Digitally-Controlled MICROPHONE PREAMPLIFIER FEATURES 1 234 FULLY DIFFERENTIAL lNPUT-TO-OUTPUT ARCHITECTURE DIGITALLY-CONTROLLED GAIN USING SPI™: – Gain Range: 9dB through 60dB, 3dB per Step – Unity (0dB) Gain Setting via Serial Port DYNAMIC PERFORMANCE: – Equivalent Input Noise with ZS = 150Ω and Gain = 30dB: –123dBu – Total Harmonic Distortion plus Noise (THD+N) with Gain = 30dB: 0.0006% ZERO CROSSING DETECTION MINIMIZES AUDIBLE ARTIFACTS WHEN GAIN SWITCHING INTEGRATED DC SERVO MINIMIZES OUTPUT OFFSET VOLTAGE COMMON-MODE SERVO IMPROVES CMRR FOUR-WIRE SERIAL CONTROL PORT INTERFACE: – Simple Interface to Microprocessor or DSP Serial Ports – Supports Daisy-Chaining of Multiple PGA2505 Devices OVER-RANGE OUTPUT PIN PROVIDES CLIPPING INDICATION FOUR GENERAL-PURPOSE DIGITAL OUTPUT PINS ±5V POWER SUPPLIES AVAILABLE IN AN SSOP-24 PACKAGE APPLICATIONS MICROPHONE PREAMPLIFIERS AND MIXERS DIGITAL MIXERS AND RECORDERS DIGITAL AUDIO EDITING SYSTEMS BROADCAST EQUIPMENT INTERCOMS DESCRIPTION The PGA2505 is a digitally-controlled, analog microphone preamplifier designed for use as a front-end for high-performance audio analog-to-digital converters (ADCs). The PGA2505 features include low noise, wide dynamic range, a...