• Ideal mate for THAT1580 preamplifiers

• Wide gain range:
+5.6 dB
+13.6 to +68.6 dB in 1 dB steps
• Wide supply range: ±5V to ±17V
• Wide output swing: +27dBu (±17V sup.)
• Wide input swing: +22dBu (±17V sup.)
• Low THD+N: 0.0003% @ 22dB gain
• Integrated differential servo minimizes output offset
• Zero-crossing detector minimizes switching noise
• Flexible, addressable SPI interface
• Four general-purpose digital outputs
• Small 7mm x 7mm QFN32 package

Datasheet Download

Datasheet Download
5171 Datasheet (853 kB)
High Performance Digital Preamplifier Controller


• 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


The THAT5171 is a digital gain controller for low-noise, analog, differential, current-feedback audio preamplifiers such as the THAT1580. When used in conjunction with an appropriate analog gain block, the 5171 can set gain to 5.6dB, or any gain from 13.6dB to 68.6dB in 1dB steps, while preserving low noise and distortion. It operates from ±5V to ±17V supplies, supporting input signal levels as high as +22 dBu (at 5.6dB gain, and ±17V supplies) in combination with the 1580 (without an external input pad). The 5171 includes a differential servo and zero-crossing detector to minimize dc offsets and glitches (zipper noise) during gain adjustments.

The 5171 is controlled via an addressable serial-peripheral interface (SPI) port. Four General Purpose Outputs (GPOs) can be controlled via this interface. The GPOs may be connected to input pads, analog switches, mute circuits, LEDs, etc. The SPI bus supports read-back so that host software can verify proper operation.

The 5171 was designed to mate perfectly with THAT1580 Differential Audio Preamplifier ICs. Together, these ICs provide a best-of-class solution for digitally-controllable audio preamplifier applications. However, for designers who prefer a more customized solution, the 5171 may also be used to control a discrete preamplifier.

Key Specifications (see 5171 datasheet for complete specifications)

Parameter Conditions 5171 Typical Units
Analog Supply Voltage Referenced to AGND 4.75 – 17 V
Digital Supply Voltage 3.0 – 3.6 V
Analog Supply Current No signal 8.3 mA
Digital Supply Current 2 µA
Max Differential Input Level 21 dBu
Max Differential Output Level 27 dBu
Gain Range Step Size 13.6 dB £ Gain ³ 68.6 dB 1 dB
Gain Range Error All gain settings ±0.25 dB
Model Package Order Number Pricing (1000) Min Order Quantity Reference
5171 32 pin QFN 5171N32-U $8.66 50 Request Samples
32 pin QFN Tape & Reel 5171N32-UR Contact us 2000
1580/5171 Demo Board 1580/5171-DEMO $250.00 1
All 5171 parts areRoHS 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.  ICs designated -UR are available on tape and reel for a modest increase in price and require an extended lead time. Please contact our sales department for pricing and current lead time.

Design Notes (as PDF files)

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

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

Digitally Controlled Microphone Preamplifier Selector
A side by side comparison of the features and specifications of our digitally controlled microphone preamplifier chip sets.

1580/5171 Digitally-Controlled Mic Preamp Demo Boards – The THAT 1580/5171 Digitally-Controlled Mic Preamp Demo Board (US$250) allows developers to evaluate the performance of the 1580/5171 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 chip via USB. A prototyping area is available for adding or modifying circuitry. See the 5171-DEMO Datasheet for more information.

5171 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.

5171 Material Data Declaration Sheet
Material Data Declaration Sheets (MDDS) disclose the hazardous materials in our integrated circuits as required by the European RoHS directive.