• Low noise: -127 dBu EIN (max gain)
• -8 dB to +34 dB gain
• Choice of step size: 1, 3, or 6 dB
• +16.5 dBu maximum input (min gain)
• Integrated ADC driver with reference input
• High common-mode rejection: > 65dB
• Very low power: 30 mW per channel
• Unipolar or Bipolar power supplies Analog: +10V +5V or ±5V; Digital: +3.3V
• Small form factor: 7x7mm QFN package
• Zero crossing detectors minimize zipper noise
• Daisy-chainable SPI control interface
• Individually controlled Standby and Mute
• Daisy Chainable SPI interface
• Two general-purpose digital outputs
• Small 5mm x 5mm QFN24 package

Datasheet Download


626x Datasheet (1.6 MB)
2-Channel Low-Noise
Preamplifier – ADC Driver
Demo Board Datasheet & Software Download

626x-DEMO Datasheet
(1.9 MB)
THAT Mic Pre DEMO Software
(23 kB ZIP file)


Digitally controlled input stages

Microphone preamplifiers
Instrumentation amplifiers
Differential amplifiers

• Audio Mixing Consoles
• PC audio interfaces
• Digital video cameras
• Digital audio snakes
• Portable audio recorders
• Programmable gain amplifiers


The THAT 626x is a family of two-channel “all-in-one” digitally controlled preamplifiers with integrated ADC drivers. Gain is programmable from -8 to +34 dB. The low-power (60 mW) devices can be powered from unipolar (+10 V and +5 V) or bipolar (±5 V) supplies. The 626x family includes three products distinguished primarily by step size:

Part 6261 6263 6266
Step size 1 dB 3 dB 6 dB

All three parts offer excellent noise performance: at a maximum gain: the 6261 EIN is -127 dBu; the 6263 and 6266 are -126 dBu. Dynamic range at a minimum gain is up to 118.7 dB.

Their outputs interface directly to commonly used 5 V ADC ICs with 2Vrms differential full-scale inputs. Accordingly, these parts serve as a complete solution to connect an audio input to an A/D converter.

To minimize audibility of gain changes with signal, all 626x family members can be programmed to synchronize gain changes with signal zero crossings. To enable seamless external gain changes, a BUSY pin for each channel allows external events to be synchronized with zero crossings.

The parts are controlled via a 4-wire SPI interface running at up to 7.5 MHz (+3.3V supply). Multiple devices may be daisy-chained using one chip select.

Four general-purpose logic outputs (GPOs) are available to control external circuitry (e.g., pad, phantom power). The GPOs may be synchronized with zero-crossings. Each channel may be set to low-power standby mode and can be muted by about 62 dB.

The 626x comes in a 7X7 mm 48-pin QFN package. They are truly all-in-one mic preamps – from XLR to ADC.

Key Specifications (see 626x datasheet for complete specifications)

Parameter Conditions 6261 Typical 6263 Typical 6266 Typical Units
Gain Range Step Size   1 3 6 dB
Analog Supply Voltage Referenced to AGND ±5 ±5 ±5 V
Digital Supply Voltage Referenced to DGND 3.3 3.3 3.3 V
Analog Supply Current (per channel) No signal 3 3 3 mA
Digital Supply Current (per channel) No signal 5 5 0.25 µA
Max Differential Input Level -8 dB Gain THD: 0.15% @1kHz 16.5 16.5 16.5 dBu
Max Gain Range Error Gain:[-8dB ~30dB] Gain: ±0.2 ±0.3 ±0.2 ±0.3 ±0.2 ±0.3 dB
Model Package Order Number Pricing (1000) Min Order Quantity Reference
6261 48 pin QFN 6261N48-U $ 7.24 50 Request Samples
48 pin QFN Tape & Reel 6261N48-UR Contact us 4000
6263 48 pin QFN 6263N48-U $ 5.97 50
48 pin QFN Tape & Reel 6263N48-UR Contact us 4000
6266 48 pin QFN 6266N48-U $ 5.27 50
48 pin QFN Tape & Reel 6266N48-UR Contact us 4000
626x Demo Board 626x-DEMO $700.00 1
All 626x 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)

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.

626x-DEMO Programmable-Gain Preamplifier Demo Board – The 626x-DEMO board (US$250) allows developers to evaluate the performance of the THAT626x IC. 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 626x chip via USB. A prototyping area is available for adding or modifying circuitry. See the 626x-DEMO Datasheet for more information.

626x 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.

626x Material Data Declaration Sheet
Material Data Declaration Sheets (MDDS) disclose the hazardous materials in our integrated circuits as required by the European RoHS directive.