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

RHD2132 amplifier / accelerometer board
RHD2132 Amplifier / Accelerometer Board with small connector for SPI interface cable and large connector for electrodes. (Click for larger image.)

Main Documentation:

RHD2000 evaluation system datasheet

RHD2000 evaluation system catalog

Supporting Documents:

Application note: Accelerometer calibration for amplifier / accelerometer boards

Application note: Adding an LED to amplifier boards

SPI interface cable/connector specification

Pricing information


RHD2132 amplifier / accelerometer board with connection ports labeled

RHD2132 amplifier / accelerometer board with connection ports labeled. The RHD2216 amplifier / accelerometer board is identical in design; only the chip is different.

The zero-ohm jumper R0 may be removed to disconnect the reference electrode from ground. The auxiliary digital output (auxout) is accessible, along with power connections. (Click for larger image.)


Electrode connector pin diagram for RHD2132 amplifier / accelerometer board
Electrode connector pin diagram for RHD2132 amplifier / accelerometer board. The two REF pins are connected on the board, so only one pin needs to be connected to a reference electrode. The GND pins are also connected on the board. (Click for larger image.)


Electrode connector pin diagram for RHD2216 amplifier / accelerometer boardElectrode connector pin diagram for RHD2216 amplifier / accelerometer board. The four GND pins are connected on the board, so only one of these pins needs to be connected externally. (Click for larger image.)

RHD2132 / RHD2216 Amplifier / Accelerometer Boards


The RHD2132 amplifier / accelerometer board and RHD2216 amplifier / accelerometer board are front-end modules 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 / accelerometer board contains an RHD2132 or RHD2216 amplifier chip, an Analog Devices ADXL335 3-axis accelerometer, a few support components (resistors and capacitors), a 12-pin Omnetics polarized nano connector that mates with an SPI interface cable, and a 36-pin Omnetics nano strip connector to mate with recording electrodes.

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

  • Monitor and record signals from 16 or 32 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.
  • Measure three axes of acceleration and orientation with respect to gravity.
  • Control external devices with auxiliary digital output port.

The ADXL335 accelerometer produces analog voltages proportional to X, Y, and Z acceleration, and these voltages are connected to the three auxiliary analog inputs on the RHD2132 or RHD2216 chip. The ADXL335 accelerometer is sensitive to dynamic acceleration as well as static acceleration due to gravity. For tips on calibrating and using the accelerometer, see the RHD2000 Application Note: Accelerometer Calibration.

The RHD2132 amplifier / accelerometer board (Part #C3324) has 32 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.

The RHD2216 amplifier / accelerometer board (Part #C3323) has 16 amplifier channels with independent bipolar inputs (i.e., in+ and in-) for paired differential recording. This board is optimized for recording situations where pairs of electrodes having similar impedances are used, such as surface EMG.

Each amplifier / accelerometer board measures 24 mm x 15.5 mm with a maximum thickness of 2.6 mm and weighs 1.03 grams. Here is a 3D model of the amplifier board in SolidWorks format.

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

The 36-pin Omnetics electrode connector of the RHD2132 amplifier / accelerometer board is compatible with a number of commercially-available electrode arrays, including the NeuroNexus CM, OCM, and H32 chronic electrode connectors, multi-channel arrays from MicroProbes, probes from Atlas Neuroengineering, probes from Cambridge NeuroTech, the Plexon CON/32m-V connector, and the Blackrock CerePlex M connector. (Intan Technologies does not manufacture or sell electrodes.) The exact order of the 32 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. The electrode adapter board may be used to adapt the RHD2132 amplifier / accelerometer board to a NeuroNexus A, OA, or D16 acute electrode connector.

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 these amplifier / accelerometer boards are available on our downloads page.

 


 

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