FEATURES
• Ideal mate for THAT 1580 and 1583 preamplifiers
• Wide gain range: 0 to 60 dB in 3 dB steps
• Wide supply range: ±5V to ±17V
• Wide output swing: +27dBu (±17V sup.)
• Wide input swing: +27dBu (±17V sup.)
• Low THD+N: < 0.001% @ 1 kHz; Up to 42 dB gain
• Integrated differential servo minimizes output offset
• Zero-crossing detector minimizes switching noise
• Daisy Chainable SPI interface
• Four general-purpose digital outputs
• Small 5mm x 5mm QFN24 package
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Datasheet Download
5173 Datasheet (381 kB)
Audio Preamplifier Digital Controller
DESCRIPTION
The THAT5173 is a digital gain controller for low-noise, analog, differential, current-feedback audio preamplifiers such as the THAT 1580, and 1583. When used in conjunction with an appropriate analog gain block, the 5173 supports digitally control gain from 0dB to 60dB in 3dB steps, while preserving low noise and distortion. It operates from ±5V to ±17V analog supplies, supporting input signal levels as high as +27 dBu (at 0dB gain and ±17V supplies) in combination with the 1580 -- without an input pad. The 5173 includes a differential servo and zero-crossing detector to minimize dc offsets and glitches (zipper noise) during gain adjustments.
The 5173 is controlled via an industry standard serial-peripheral interface (SPI) port. Four General Purpose Outputs (GPOs) can be controlled via this interface. The GPOs may be used to control auxillary functions such as input selectors, filters, mutes, LEDs, relays, etc.
The 5173 was designed to mate perfectly with the THAT 1580 or 1583 Differential Audio Preamplifier ICs. Together, the 1580/5173 or 1583/5173 combination provides a high performance solution for digitally-controllable audio preamplifier applications. However, the 5173 may also be used to control a discrete preamplifier.
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