THAT5171 Datasheet | THAT

Features - Ideal mate for THAT1580 preamplifier - Wide gain range: - +13.6 to +68.6d B in 1d B steps, and - +5.6d B - Wide supply range: ±5V to ±17V - Wide output swing: +27d Bu (±17V sup.) - Wide input swing: +22d Bu (±17V sup.) - Low THD+N: 0.0003% @ 22d B 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 5.6d B, or any gain from 13.6d B to 68.6d B in 1d B steps, while preserving low noise and distortion. It operates from ±5V to ±17V supplies, supporting input signal levels as high as +22 d Bu (at 5.6d B gain, and ±17V supplies) in bination 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 is controlled via an addressable serial-peripheral interface (SPI) port. Four General Purpose Outputs (GPOs) can be controlled via this interface. The GPOs may be connected to input pads, analog switches, mute circuits, LEDs, etc. The SPI bus supports read-back so that host software can verify proper operation. The 5171 was designed to mate perfectly with the THAT 1580 Differential Audio Preamplifier IC. Together, these two ICs provide a best-of-class solution for digitally-controllable audio...