IMPORTANT: The 1570 is not recommended for new designs.

• Low Noise: 1nV/√Hz 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 4x4mm QFN16 package
• Mates with THAT5171 Digital Preamplifier Controller or
THAT5173 Digital Preamplifier Controller

Datasheet Download

1570 Datasheet (130 kB)
Low-Noise Differential Audio Preamplifiers


• 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


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 is designed to mate perfectly with THAT’s 5171 and 5173 Digital Preamplifier Controller ICs. Along with the 1570, these switched resistor networks provide optimized, digitally controlled audio preamplifiers.

Key Specifications (see 1570 datasheet for complete specifications)

ParameterConditions1570 TypicalUnits
Equivalent Input Noise0 dB gain
60 dB gain
Total Harmonic Distortion0 dB gain
20 dB gain
40 dB gain
60 dB gain
Bandwidth -3dB (small signal)0 dB gain
20 dB gain
40 dB gain
60 dB gain
Slew Rate53V/µs
Supply VoltageMaximum
± 18
± 5
Supply CurrentNo signal7.5mA
Model Package Order Number Pricing (1000) Min Order Quantity Reference
1570 16 pin QFN 1570N16-U $4.79 92 Request Samples
16 pin QFN Tape & Reel 1570N16-UR Contact us 2000
1570/5171 Demo Board 1570/5171-DEMO $250.00 1
1570/5173 Demo Board 1570/5173-DEMO $250.00 1
All 1570 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.

Design Notes (as PDF files)

Design Note 140   Input and Output Circuits for THAT Preamplifier ICs (244k)

More Analog Secrets Your Mother Never Told You (915k)
A sequel to our popular first “Analog Secrets” seminar, this new presentation exposes more design secrets including “extreme performance” microphone preamps, protecting audio inputs/outputs during phantom power faults, and maintaining high dynamic range in low cost applications.

Related Products
Differential Audio Preamplifiers
THAT 1580 Low Noise Differential Audio Preamplifier 1580 Datasheet
THAT 1583 Low Noise Differential Audio Preamplifier 1583 Datasheet
  Gain Controllers
THAT 5171 Digital Preamplifier Controller 5171 Datasheet
THAT 5173 Low-Cost Digital Preamplifier Controller 5173 Datasheet
THAT 5263 2 Channel Digital Preamplifier Controller 5263 Datasheet
Digitally Controlled Microphone Preamplifiers
THAT 1580/5171 5171 Digital Microphone Preamplifier Chip Set
THAT 1580/5173 5173 Digital Microphone Preamplifier Chip Set
THAT 1583/5173 5173 Digital Microphone Preamplifier Chip Set
THAT 1580/5263 5263 Digital Microphone Preamplifier Chip Set
THAT 1583/5263 5263 Digital Microphone Preamplifier Chip Set
THAT 626X 626x Dual Programmable-Gain Preamplifier/ADC Driver 626x Datasheet
Audio Preamplifiers
THAT 1510/1512 Low Noise Single Ended Output Audio Preamplifiers 1510/1512 Datasheet

Additional Resources

Microphone Preamplifier Selector
A side by side comparison of the features and specifications of our microphone preamplifier ICs.

1570/5171 and 1570/5173 Digitally-Controlled Mic Preamp Demo Boards – A THAT Digitally-Controlled Mic Preamp Demo Board (US$250) allows developers to evaluate the performance of the THAT1570 / THAT5171 or THAT1570 / THAT5173 chipset. 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 or 5173 chip via USB. A prototyping area is available for adding or modifying circuitry. See the 1570/5171-DEMO Datasheet or the 5173-DEMO Datasheet for more information.

1570 Surface Mount Adapter Board – For our integrated circuits which are only available in surface mount packages THAT Corporation offers adapter boards which allow one of these surface-mount ICs to interface to a circuit board via traditional thru-hole mounting. These adapters make it easy for a design engineer to evaluate our surface-mount products on a prototype board without having to employ SMT technology. Adapter boards are available to qualified applicants.

Harsh Environment Packaging – TT Semiconductor repackages THAT Corporation’s IC products in ruggidized plastic for the medical, aerospace, defense, and heavy industrial marketplaces.

1570 Material Data Declaration Sheet
Material Data Declaration Sheets (MDDS) disclose the hazardous materials in our integrated circuits as required by the European RoHS directive.