THAT1570 - Low-Noise Differential Audio Preamplifier IC

The THAT1570 is a versatile, high performance current-feedback amplifier suitable for differential microphone preamp and bus summing applications. The IC comes in a small QFN package, which saves PCB space over discrete and other integrated solutions.

Gain is adjusted via three external resistors (RA, RB, and RG), making it possible to optimize noise over a wide range of gains. The 1570 supports the traditional approach to gain control (viz., THAT's 1510 or 1512) by fixing RA and RB, and varying RG to control gain. However, the 1570 also supports varying all three resistors simultaneously with a dual-gang potentiometer, or a switched resistor network. This flexible approach enables the designer to optimize noise over a wider range of gains than is possible with fixed RA and RB.

The 1570's differential output simplifies connection to differential input devices such as A/D converters. The part operates from as little as ±5V up through ±18V supplies. Running on ±18V supplies, at unity gain, the part accepts >+28dBu input signals.

The 1570 is designed to mate perfectly with THAT's 5171 Digital Preamplifier Controller IC. Along with the 1570, this switched resistor network provide an optimized, digitally controlled audio preamplifier.

Designed from the ground up in THAT's complementary bipolar dielectric-isolation process and including laser-trimmed Si-Chrome thin-film resistors, the 1570 improves on existing integrated microphone preamps by offering more versatile gain configuration, lower noise at low gains, higher slew rate, and lower distortion.

Features Low Noise: 1 nV/rtHz input noise (60 dB gain) Low Noise at Unity Gain: -109 dBu Low THD+N: 0.0005% @ 30 dB gain 0.0008% @ 40 dB gain Low Current: 7.5 mA typ Wide Bandwidth: 4.2 MHz @40dB gain High Slew Rate: 53 V/µs Wide Signal Swing: >28.7 dBu (±18V supplies) Gain adjustable from 0 to >60 dB Differential output Small 4 x 4 mm QFN16 package Mates with THAT5171 Digital Preamplifier Controller IC

Applications Digitally-Controlled Microphone Preamplifiers Differential Low-Noise Preamplifiers Differential Summing Amplifiers Differential Variable-Gain Amplifiers Microphone Preamplifiers Moving-Coil Transducer Amplifiers Line Input Stages Audio Sonar Instrumentation

For complete specifications, download a copy of the 1570 Series 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.

Model	Package	Pricing (1000)	Part Number	Min Order Quantity	Reference
1570	16 Pin QFN	$3.19 USD	1570N16-U	92	1570 Datasheet RoHS Info
	16 Pin QFN Tape and Reel	**	1570N16-UR	2000

All 1570 parts are RoHS compliant.
Minimum Order Quantity is one tube full. Parts must be ordered in multiples of the MOQ.
Samples are available for qualified applicants.
Pricing is subject to change.

**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.

The THAT1570 is designed to mate perfectly with THAT's 5171 Digital Preamplifier Controller IC to create an optimized, Digitally Controlled Audio Preamplifier. A demonstration system is available for this 1570/5171 combination. The THAT Digitally-Controlled Microphone 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.