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TI Unveils Industry's First Digitally Controlled Microphone Preamplifier IC from Burr-Brown Pro Audio Product Line

Dec 19, 2003

TUCSON, Ariz. (Dec. 19, 2003) - Texas Instruments Incorporated (TI) (NYSE: TXN) today introduced the industry´s first digitally controlled microphone preamplifier IC (integrated circuit) from the company´s Burr-Brown Pro Audio product line. The PGA2500 is designed for use as a front end for high-performance analog-to-digital converters in a variety of professional audio applications, such as microphone preamplifiers, digital audio mixers and recorders, and broadcast and studio equipment. (See www.ti.com/sc03263.)

"There is no other device on the market which offers this level of performance, functionality and integration, making it very compelling for systems where the PGA2500 is used as a mic preamp in front of an audio A/D converter," said Mike Centorino, marketing manager for TI's Burr-Brown Pro Audio products. "Since the PGA2500 is digitally controlled, it is especially useful in systems where the customer is controlling the gain of the mic preamp from a remote location. This innovative device provides an unmatched solution for audio designers who have been developing discrete digitally controlled mic preamps."
Prior to the integrated PGA2500, a discrete mic preamp design included a combination of ICs and discrete parts to achieve a digitally controlled solution. Such a solution commonly incorporated instrumentation amplifiers, digital potentiometers/volume controls, switches/relays and discrete op amps. In addition to eliminating numerous components, the PGA2500 offers higher dynamic range, lower THD+N, and lower equivalent input noise versus gain when compared to discrete designs.
The PGA2500 features a wide gain range of 10dB through 65dB (1dB per step), allowing the IC 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 a daisy-chain connection of multiple PGA2500 devices. Other 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. Four programmable digital outputs are provided for controlling the external switching of input pads, phantom power, high pass filters and polarity reversal functions. The device operates on a +/-5V supply.

Available Today

The PGA2500 is packaged in a 28-lead SSOP, and is available now from TI and its authorized distributors. The PGA2500 is priced from $9.95 in 1,000 piece quantities (suggested resale pricing). An evaluation module (EVM) is available.