THAT5171

FEATURES  Ideal mate for THAT1580 preamplifier  Wide gain range: – +13.6 to +68.6dB in 1dB steps, and – +5.6dB  Wide supply range: ±5V to ±17V  Wide output swing: +27dBu (±17V sup.)  Wide input swing: +22dBu (±17V sup.)  Low THD+N: 0.0003% @ 22dB gain  Integrated differential servo minimizes output offset  Zero-crossing detector minimizes switching noise  Flexible, addressable SPI interface  Four general-purpose digital outputs  Small 7mm x 7mm QFN32 package High-Performance Digital Preamplifier Controller IC THAT 5171 APPLICATIONS  Digitally controlled microphone preamplifiers  Digitally-controlled instrumentation amplifiers  Digitally-controlled differential amplifiers  Audio mixing consoles  PC audio breakout boxes  Audio distribution systems  Digital audio snakes  Portable audio recorders Description The THAT5171 is a digital gain controller for lownoise, analog, differential, current-feedback audio preamplifiers such as the THAT 1580. When used in conjunction with an appropriate analog gain block, the 5171 can set gain to 5.6dB, or any gain from 13.6dB to 68.6dB in 1dB steps, while preserving low noise and distortion. It operates from ±5V to ±17V supplies, supporting input signal levels as high as +22 dBu (at 5.6dB gain, and ±17V supplies) in combination with the 1580 (without an external input pad). The 5171 includes a differential servo and zerocrossing detector to minimize dc offsets and glitches (zipper noise) during gain adjustments. The 5171 i...