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THAT 1570/5171
Basic Application Circuit |
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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 1mV.
Four general purpose outputs on the 5171 can be connected to a variety of peripheral functions, e.g. mute, 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 microphone preamp front end (THAT1570) from the digital functions and switched resistor ladder (THAT5171) allows each IC to be optimized for high performance.
The THAT1570 is fabricated using THAT’s complementary dielectric isolation process and precision laser-trimmed Si-Chrome thin film resistors, yielding extremely high performance. The THAT5171 is fabricated using a high-voltage CMOS process, with proprietary techniques for reducing FET switching glitches. Packaged in 4x4mm QFN16 and 7x7mm QFN32 packages respectively, the THAT1570 and THAT5171 require very little PCB area.
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Features
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Versatile two-chip solution:
1570 Variable-gain audio preamplifier
5171 Digitally programmable gain controller
- Accommodates full pro audio levels:
+21 dBu max input with ±15V supplies
- Programmable gain:
+5.6 dB; +13.6 ~ 68.6 dB in 1 dB steps
- Low Noise: 1.5 nV/√Hz @ 65.6 dB gain
- Low THD+N: 0.0003% @ 20.6 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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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
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 For complete specifications, download a
copy of the 1570 Datasheet and the 5171 Datasheet.
Datasheets are
provided in Adobe's PDF format. You need to have Adobe
Acrobat Reader installed on your computer to view the file. To
obtain a free copy of Acrobat Reader follow the link at right.
 All 1570 and 5171 parts are RoHS compliant.
Minimum order quantity (MOQ) is one tube or one reel.
Parts must be ordered in multiples of the MOQ.
Samples are available to qualified applicants.
Pricing is subject to change.
* Price when 1570 and 5171 are purchased as a pair. Pricing varies when purchased separately.
**All models are available on tape and reel for a modest increase in
price and require an extended lead time. Tape and reel parts have a
2000 piece minimum and must be ordered in multiples of 2000. Please
contact our sales department for pricing and delivery.
A demonstration system is available for the 1570/5171 set. The THAT Digitally-Controlled Mic Preamp Demo Board allows developers to evaluate the performance of the THAT1570 / THAT5171 ICs in a typical application. The demo board provides a balanced audio input on a Neutrik "combo" connector with 48V phantom power, and a balanced audio output on XLR and ¼" TRS connectors. The supplied graphical user interface (GUI) controls all functions in the 5171 chip via USB. A prototyping area is available for adding new circuitry, or modifying existing circuitry. For more information see the 1570/5171-Demo User's Guide or contact sales at the address below.
For questions, samples
or further pricing information, please contact us
directly by telephone: +1(508)634-9922, fax:+1(508)634-6698, or email: sales@thatcorp.com.
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