FEATURES
• Versatile two-chip solution:
- 1570 Programmable analog gain block
- 5171 Digital gain controller
• Accommodates full pro audio levels
+21 dBu max input @ min gain and ±15V supplies
• Programmable gain:
+5.6 dB, +13.6 ~ 68.6 dB in 1dB steps
• Low Noise: -128 dBu EIN, 68.8 dB gain, Rs = 150 Ω
• Low THD+N: 0.0003% @ 21.6 dB gain
• Integrated servo minimizes dc offset
• Integrated zero crossing detector minimizes zipper noise
• Addressable SPI control interface with
read-back Operates up to 10MHz
• Four general purpose outputs (GPOs)
• Small footprint:
4 x 4 mm QFN16 (1570)
7 x 7 mm QFN32 (5171)
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DESCRIPTION
The THAT1570 and THAT5171 ICs enable digitally controlled microphone preamplifier applications with unprecedented performance. Operating on maximum ±17V supplies, the chipset accepts pro audio input levels (+22dBu max) without an input pad. Gain is adjustable to 5.6dB, and from 13.6dB to 68.6dB in 1dB increments. The 5171’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 1.5 mV.
Four general purpose outputs on the 5171 can be connected to a variety of peripheral functions, e.g. input pad, phantom power switches, signal routing switches, LED indicators, etc. The addressable SPI interface on the 5171 supports read-back, enabling fault-tolerant control software to verify proper operation. Separating the analog mic pre front end (THAT1570) from the digital functions and switched resistor ladder (THAT5171) allows each IC to be optimized for high performance.
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