FEATURES
• Ideal mate for THAT1580 preamplifiers
• Wide gain range:
+5.6 dB
+13.6 to +68.6 dB in 1 dB steps
• 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
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Datasheet Download
5171 Datasheet (522 kB)
High Performance Digital Preamplifier Controller
DESCRIPTION
The THAT5171 is a digital gain controller for low-noise, analog, differential, current-feedback audio preamplifiers such as the THAT1580. 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 zero-crossing 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 THAT1580 Differential Audio Preamplifier ICs. Together, these ICs provide a best-of-class solution for digitally-controllable audio preamplifier applications. However, for designers who prefer a more customized solution, the 5171 may also be used to control a discrete preamplifier.
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