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

RHD2000 SPI interface cables
RHD2000 SPI interface cables are available in a standard version with a diameter of 2.9 mm (blue cable, left) and an Ultra Thin version with a diameter of 1.8 mm (violet cable, right). (Click for larger image.)

Main Documentation:

SPI interface cable/connector specification

RHD2000 evaluation system datasheet

RHD2000 evaluation system catalog

Supporting Documents:

RHD2000 dual headstage adapter datasheet

Application note: Adapting SPI cables to a commutator

Pricing information

RHD2000 SPI interface cables

Each RHD2000 SPI interface cable has a self-aligning 12-pin polarized nano connector on each end. The wiring pattern supports daisy-chaining multiple cables in series to span lengths of several meters. (Click for larger image.)

SPI cable flexibility

The Ultra Thin SPI cable is significantly more flexible than the standard SPI cable. The ultra thin cable has half the weight and 39% the cross-sectional area of the standard cable.

RHD2000 SPI Interface Cables

To support the RHD2000 Evaluation System, Intan Technologies has developed a standard interface cable and connector scheme to transmit serial digital data and power over distances of several meters using the Serial Peripheral Interface (SPI) protocol. These RHD2000 SPI interface cables allow RHD2000-based electrophysiology amplifier boards or headstages to be located some distance from the RHD2000 USB interface board that controls the chips and streams data from them into a host computer. The design of this cable is quite simple, and can serve as an example for more sophisticated variations of wired interfaces to RHD2000 chips.

RHD2000 SPI interface cables have the following features:

  • Self-aligning standard Omnetics PZN-12 polarized nano connectors; no guide pins required.
  • Twisted pair wiring inside cable facilitates the use of Low-Voltage Differential Signaling (LVDS) communication for low-noise operation and high signal integrity over long distances with no shielding required.
  • Each 12-conductor cable contains two power wires and five LVDS pairs: one cable can support two RHD2000-series chips if command signals are shared (e.g., using a dual headstage adapter).
  • Small connector size: 4.5 mm x 4.3 mm x 2.0 mm
  • Cable design permits daisy-chaining for easy adjustment of cable length.
  • Available in two cable thicknesses: standard (2.9 mm diameter) and ultra thin (1.8 mm diameter).

Standard SPI interface cables have a diameter of 2.9 mm and a mass of 8.2 g/m. The cable is coated in a flexible blue thermoplastic elastomer (TPE) jacket.

Ultra Thin SPI interface cables have a diameter of 1.8 mm and a mass of 4.1 g/m. These cables are coated in a violet-colored silicone rubber jacket over PTFE tape, providing extremely high flexibility.

The following SPI cables are available for Intan Technologies:

  • RHD2000 3-ft (0.9 m) standard SPI cable (Part #C3203)
  • RHD2000 6-ft (1.8 m) standard SPI cable (Part #C3206)
  • RHD2000 1-ft (0.3 m) Ultra Thin SPI cable (Part #C3211)
  • RHD2000 3-ft (0.9 m) Ultra Thin SPI cable (Part #C3213)
  • RHD2000 6-ft (1.8 m) Ultra Thin SPI cable (Part #C3216)

Multiple cables may be daisy chained to span lengths of several meters.

Technical details on the SPI cables and connectors may be found in the SPI interface cable/connector specification.

Intan Technologies also offers an SPI cable adapter board (Part #C3430) that connects to a cable and brings out all its signals to 0.1" pitch solder holes for easy access. This board may be used to interface RHD2000 SPI interface cables with prototype devices. It may also be used to connect RHD2000 SPI signals to a commutator, as described in the RHD2000 Application Note: Adapting SPI Cables to a Commutator.

The RHD2000 dual headstage adapter (Part #C3440) connects two amplifier boards to a single SPI interface cable.

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.



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