Product category: Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: PGA2500
Edited by the Electronicstalk Editorial Team on 24 December 2003
Microphone preamp takes digital control
The PGA2500 is billed as the industry's first digitally controlled microphone preamplifier IC
This latest addition to the Burr-Brown Pro Audio product line is designed for use as a front end for high-performance analogue-to-digital convertors in a variety of professional audio applications, such as microphone preamplifiers, digital audio mixers and recorders, and broadcast and studio equipment.
This article was originally published on Electronicstalk on 24 December 2003 at 8.00am (UK)
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'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 microphon preamp in front of an audio A/D convertor', 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 microphone preamp from a remote location.
This innovative device provides an unmatched solution for audio designers who have been developing discrete digitally controlled microphone preamps'.
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Prior to the integrated PGA2500, a discrete microphone 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 10 to 65dB (1dB per step), allowing the IC to be used with a variety of microphones.
Gain settings and internal functions are programmed using a 16bit control word, which is loaded using a simple serial port interface.
A serial data output pin provides support for a daisychain 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 minimise DC offset, and 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, highpass filters and polarity reversal functions.
The device operates from a +/-5V supply.
The PGA2500 is packaged in a 28-lead SSOP, and is available now from TI and its authorised distributors.
The PGA2500 is priced from $9.95 in 1000-piece quantities (suggested resale pricing).
An evaluation module is available.
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