Audio preamplifier chipset allows designers to tradeoff power vs. dynamic range

Milford, Mass.—THAT Corp. has introduced a digitally programmable microphone preamplifier that offers unprecedented 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 130 dB 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 1-dB steps from 13.6 dB to 68.6 dB. An additional gain setting of +5.6 dB allows the combination to accept line inputs up to +22 dBu. Other high-performance specifications and features include: low noise of 1.5 nV/Hz @ 68.6 dB gain, and 20 nV/Hz @ 5.6 dB gain; low THD+N of 0.0003% @ 21.6 dB 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 4×4 mm QFN16 package, and the 5171 in a 7×7 mm QFN32.

Pricing: $8.91 in 1000-pc quantities.
Availability: Now.
Datasheets: click here.

Demo board available
A demo board is available now and provides a complete microphone preamplifier, and includes facility for applying 48-V phantom power under USB control via Windows applications. The board also provides a prototyping area for adding and/or modifying circuitry. The demo board costs $250.

THAT Corp.,

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