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Preamp chipsets offer flexibility in pro audio apps

Posted: 13 Oct 2009 ?? ?Print Version ?Bookmark and Share

Keywords:preamplifier? audio equipment design? microphone?

THAT1570/5171 chipset

THAT Corp. has developed a digitally programmable microphone preamplifier that offers high performance and flexibility for designers of pro audio equipment.

The THAT1570/5171 paired chipset consists of a low-noise differential audio preamplifier (1570) and a separate high-performance digital preamplifier controller (5171). Compared to competing single-chip implementations that operate from only 5 V supplies, the 1570/5171 enables much greater flexibility with up to 130dB dynamic range when operating from 17 V supplies, allowing designers to tradeoff power consumption versus dynamic range, the company said.

The part-pair enables gain to be programmed over 56 dB steps from 13.6dB to 68.6dB. An additional gain setting of +5.6 dB allows the combination to accept line inputs up to +22dBu. Other high-performance specifications and features include: low noise of 1.5nV/Hz @ 68.6dB gain, and 20nV/Hz @ 5.6dB gain; low THD+N of 0.0003 percent @ 21.6dB gain; and wide bandwidth of 1.8MHz @ 40.6 dB gain. In addition, integrated features simplify design, including: a servo for minimizing DC offset; a zero crossing detector and other patent pending techniques for minimizing gain-switching noise, and four general-purpose digital outputs.

THAT's 1570/5171 can be applied to: audio mixing consoles, digital audio snakes, audio distribution systems, PC audio breakout boxes, and more. The 1570 is housed in a tiny 4mm x 4mm QFN16 package, and the 5171 in a 7mm x 7mm QFN32.

Pricing for the 1570/5171 is $8.91 in 1,000-piece quantities.

- Ismini Scouras
EE Times

For application notes on preamplifiers click here.

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