Electronic Design

Digital Controller Enhances Preamp Operation

Groomed for use with low-noise analog, differential, current-feedback audio preamplifiers, the THAT5171 digital gain controller can set gain in 1 dB steps, while preserving low noise and distortion. The device operates from ±5V to ±17V supplies and supports input signal levels as high as +22 dBu at 5.6 dB gain and ±17 V supplies. Gain error is guaranteed at ±0.5 dB maximum at all gain settings. To reduce zipper noise in audio applications, the 5171 includes a differential servo and zero-crossing detector to minimize dc offsets and glitches during gain adjustments. Available in a 7 mm x 7 mm QFN32 package, price is $6.70 each/1,000. THAT CORP., Milford, MA. (508) 478-9200.
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