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

RHD2164 amplifier board
RHD2164 64-Channel Amplifier Board with small connector for SPI interface cable and two 36-pin connectors for electrodes. (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

RHD2164 amplifier board with connection ports labeled

RHD2164 64-channel amplifier board (Part #C3315) with connection ports labeled. The zero-ohm jumper R0 may be removed to disconnect the reference electrode from ground. A 0.10" mounting hole is provided for optional mechanical attachment. (Click for larger image.)

RHD2164 amplifier board with connection ports labeled

RHD2164 64-channel amplifier/accelerometer board (Part #C3325) adds a 3-axis accelerometer in place of the mounting hole.

Electrode connector pin diagram for RHD2164 amplifier board (top)

Electrode connector pin diagram for RHD2164 amplifier board (bottom)
Electrode connector pin diagrams for RHD2164 64-channel amplifier board. The four REF pins are connected on the board, so only one pin needs to be connected to a reference electrode. The four GND pins are also connected on the board. (Click for larger images.)

RHD2164 64-Channel Amplifier Board

The RHD2164 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 RHD2164 amplifier chip, a few support components (resistors and capacitors), a 12-pin Omnetics polarized nano connector that mates with an SPI interface cable, and two 36-pin Omnetics nano strip connectors to mate with 64 recording electrodes.

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

  • Monitor and record signals from 64 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 RHD2164 64-channel amplifier board (Part #C3315) has 64 amplifier channels with unipolar inputs and a common reference electrode input. 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 21 mm x 14 mm with a maximum thickness of 4.7 mm and weighs 1.30 grams. Here is a 3D model of the amplifier board in SolidWorks format.

The RHD2164 64-channel amplifier/accelerometer board (Part #C3325) includes a 3-axis accelerometer in place of the mounting hole. This board is slightly larger (22 mm x 14 mm) and weighs 1.38 grams.

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

The dual 36-pin Omnetics electrode connectors of the RHD2164 64-channel amplifier board are compatible the NeuroNexus H64LP electrode connector; the circuit board is 0.036 inches thick. (Intan Technologies does not manufacture or sell electrodes.) NeuroNexus also offers adapters between the H64LP connector and other types of electrode connectors. MicroProbes, Atlas Neuroengineering, and Cambridge NeuroTech can also make multi-channel arrays to mate with this amplifier board. The exact order of the 64 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 electrode adapter board and a 36-pin wire adapter. These adapters may be connected to either or both of the two 36-pin connectors on the amplifier board.

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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