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

RHD2000 Evaluation System
RHD2000 USB interface board connected to an amplifier board via an SPI interface cable. (Click for larger image.)

Main Documentation:

RHD2000 evaluation system datasheet

RHD2000 evaluation system catalog

Application note: I/O voltage level shifting

Supporting Documents:

RHD2000 USB/FPGA interface: Rhythm webpage, datasheet

Pricing information

RHD2132 amplifier board with connection ports labeled

RHD2000 USB interface board with connection ports labeled. (Click for larger image.)

RHD2000 USB Interface Board

The RHD2000 USB interface board (Part #C3100) is the central hardware component of 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.

The 15.5 cm x 9.9 cm board is powered from a 5V power jack from an AC adapter with international plug adapter (included). The board uses an Opal Kelly XEM6010 USB/FPGA interface module that connects to a host computer via USB. When the RHD2000 interface software starts, the Intan Technologies Rhythm interface is quickly downloaded to the Xilinx Spartan-6 FPGA (Field Programmable Gate Array).

The FPGA is configured to control multiple RHD2000 digital electrophysiology amplifier chips and to stream data from these chips back to the host computer. RHD2000 amplifier boards are connected to SPI Ports A-D using SPI interface cables.

The RHD2000 USB interface board includes screw terminal blocks for I/O signals. The 16 digital inputs and 8 analog inputs are sampled in synchrony with the amplifiers and accept signals in the range of 0 – +3.3V. Circuits to accommodate wider voltage ranges are described in the RHD2000 Application Note: I/O voltage level shifting.

On-board DACs provide 8 analog outputs in the range of ±3.3V; these are used for reconstructing selected digitized amplifier signals back to analog waveforms with low latency. Two DAC channels are also routed to the left and right channels of the audio line out jack, which can be connected to an audio amplifier for real time monitoring of any two selected amplifier signals.

The board also includes 16 digital outputs with a 3.3V signal level. Eight of these lines are used to implement low-latency threshold comparators that operate on the signals routed to the DAC outputs. The board also includes several connections for powering external devices from the ±3.3V or +5V supplies. Terminals providing ground for Faraday cage shielding is provided. It is recommended that any conductive shield used in biopotential recording experiments is tied to a ground terminal for improved rejection of 50/60 Hz interference.

Intan Technologies offers a wide range of amplifier boards that may be used with this USB interface board, including:

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 interface board are available on our downloads page.

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