Intan Technologies, LLC: low-noise amplifier microchips for electrophysiology, EKG, EMG, EEG, ECoG, and neural recording headstages and bio instrumentation

RHD2132 16-channel amplifier board with SPI interface cable
RHD2132 16-Channel Amplifier Board plugged into ultra thin SPI interface cable that provides power to the board and conveys serial digital data. (Click for larger image.)

Main Documentation:

RHD2000 evaluation system datasheet

RHD2000 evaluation system catalog

Supporting Documents:

Application note: Adding an LED to amplifier boards

SPI interface cable/connector specification

Pricing information


RHD2132 16-channel amplifier board with connection ports labeled

RHD2132 16-channel amplifier board with connection ports labeled. The zero-ohm jumper R0 may be removed to disconnect the reference electrode from ground. (Click for larger image.)


Electrode connector pin diagram for RHD2132 16-channel amplifier board
Electrode connector pin diagram for RHD2132 16-channel amplifier board. Amplifier channels 0-7 and 24-31 are tied to ground. (Click for larger image.)

RHD2132 16-Channel Amplifier Board


The RHD2132 16-channel amplifier board is a front-end module designed to work with the RHD2000 Evaluation System, a family of open-source hardware and software that allows users to record biopotential signals from up to 256 low-noise amplifier channels using the revolutionary RHD2000 series digital electrophysiology chips from Intan Technologies.

Each amplifier board contains a RHD2132 amplifier chip, a few support components (resistors and capacitors), a 12-pin Omnetics polarized nano connector that mates with an SPI interface cable, and an 18-pin Omnetics nano strip connector to mate with recording electrodes.

Each amplifier board has the following capabilities when used with an RHD2000 USB interface board:

  • Monitor and record signals from 16 low-noise amplifier channels at sampling rates ranging from 1 kSamples/s to 30 kSamples/s per channel.
  • Reconfigure amplifier analog bandwidth from software over a range of 0.1 Hz to 20 kHz.
  • Measure in situ electrode impedances (both magnitude and phase) at arbitrary frequencies.

The RHD2132 16-channel amplifier board (Part #C3334) has 16 amplifier channels with unipolar inputs and a common reference electrode input. (The other 16 channels of the 32-channel RHD2132 chip are tied to ground on this board.) This electrode configuration is often used with implanted microelectrodes that have one low-impedance reference wire and a large number of high-impedance recording sites.

Each amplifier board measures 23 mm x 13 mm with a maximum thickness of 2.6 mm and weighs 0.74 grams. Here is a 3D model of the amplifier board in SolidWorks format.

Images below show the electrode connector pin diagrams for the board as well as the location of other ports on the board that may be used for custom modifications.

The 18-pin Omnetics electrode connector of the RHD2132 16-channel amplifier board is compatible with a number of commercially-available electrode arrays, including the NeuroNexus CM, OCM, and HC16 chronic electrode connectors, multi-channel arrays from MicroProbes, probes from Atlas Neuroengineering, and probes from Cambridge NeuroTech. (Intan Technologies does not manufacture or sell electrodes.) The exact order of the 16 amplifier channels may differ from the numbering on a particular electrode array, but amplifier channels may be renamed and reordered in the software GUI to match any configuration.

If electrodes with an appropriate mating connector are not available, Intan Technologies offers an 18-pin wire adapter.

Intan Technologies offers other amplifier boards, including:

A dual headstage adapter allows two amplifier boards to be used with a single SPI interface cable to create high-density recording modules.

The operation of the USB interface board and amplifier boards are described in more detail in the RHD2000 evaluation system datasheet. All components of the system are shown in the RHD2000 evaluation system catalog. The evaluation system is built around our open-source Rhythm USB/FPGA interface.

Complete schematics of this amplifier board are available on our downloads page.

 


 

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