DESCRIPTION
    The THAT1570 and THAT5173 ICs enable digitally controlled microphone preamplifier applications with unprecedented performance. Operating on maximum ±17V supplies, the chipset accepts pro audio input levels (+27dBu max) without an input pad. Gain is adjustable from 0dB to 60dB in 3dB increments. The 5173’s built-in zero-crossing detector and other patent-pending techniques for reducing zipper noise enable very smooth and silent gain changes. A differential servo reduces output offsets to less than 1.75 mV. Four general purpose outputs on the 5173 can be connected to a variety of peripheral functions, e.g. input pad, phantom power switches, signal routing switches, LED indicators, etc. Separating the analog mic pre front end (THAT1570) from the digital functions and switched resistor ladder (THAT5173) allows each IC to be optimized for high performance.
 FEATURES
• Versatile two-chip solution:
 - 1570 Programmable analog gain block
 - 5173Digital gain controller

• Accommodates full pro audio levels
  +27 dBu max input with ±17V supplies

• Programmable gain: 0 to 60 dB in 3 dB steps

• Low Noise: -127 dBu EIN, 60 dB gain, Rs=150 Ω

• Low THD+N: < 0.001% @ 1kHz, Up to 42 dB gain

• Integrated servo minimizes output offset

• Integrated zero crossing detector minimizes switching noise

• Daisy Chainable SPI control interface

• Four general purpose outputs (GPOs)

• Small footprint:
   4 x 4 mm QFN16 (1570)
   5 x 5 mm QFN24 (5173)