RHD SPI Interface Cables and Cable Adapters

RHD SPI Interface Cables

The RHD recording system uses 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.

The following RHD SPI cables are available from Intan Technologies:

  • RHD 3-ft (0.9 m) standard SPI cable (Part #C3203)
  • RHD 6-ft (1.8 m) standard SPI cable (Part #C3206)
  • RHD 1-ft (0.3 m) ultra thin SPI cable (Part #C3211)
  • RHD 3-ft (0.9 m) ultra thin SPI cable (Part #C3213)
  • RHD 6-ft (1.8 m) ultra thin SPI cable (Part #C3216)

Multiple cables may be daisy chained to span lengths of several meters (see table below).

Technical Specs
SPI cable
ultra thin
SPI cable
connector type Omnetics PZN-12 polarized nano
connector size 4.5 mm x 4.3 mm x 2.0 mm
color blue violet
cable diameter 2.9 mm 1.8 mm
cable mass 2.5 g/ft
8.2 g/m
1.2 g/ft
4.1 g/m
outer jacket material 0.013" thermoplastic elastomer (TPE) 0.013" silicone rubber
maximum cable length
(16ch or 32ch headstage)
33 ft (9.9 m) 33 ft (9.9 m)
maximum cable length
(2x32ch or 64ch headstage)
30 ft (9.0 m) 30 ft (9.0 m)
maximum cable length
(2x64ch or 128ch headstage)
21 ft (6.3 m) 12 ft (3.6 m)
Intan RHD SPI interface cables
RHD SPI interface cables are available in a standard version (blue cable, diameter 2.9 mm) and an ultra thin version (violet cable, diameter 1.9 mm).
Intan RHD SPI interface cables
Each RHD SPI interface cable has self-aligning 12-pin polarized nano connectors on each end. The wiring pattern supports daisy-chaining multiple cables in series to span lengths of several meters.

RHD Dual Headstage Adapter

The RHD dual headstage adapter (Part #C3442) connects two RHD headstages to a single SPI cable, enabling high-density recording modules with up to 128 total channels. The adapter is approximately 8.7 cm long and weighs 1.9 g.

An SPI cable should be plugged into the center connector and RHD headstages attached to the left and right connectors, as shown below right. All RHD headstages except the 128-channel headstage are compatible with this device.

Use of this adapter with daisy-chained SPI interface cables exceeding 6 feet (1.8 meters) in total length may require a minor modification of one amplifier board to maintain high fidelity of the digital data. These technical details are discussed in the RHD dual headstage adapter datasheet.

Intan RHD dual headstage adapter
Dual headstage adapter for use with RHD headstages and SPI cables.
Intan RHD dual headstage adapter
Two RHD 64ch headstages attached to a dual headstage adapter to create a 128ch module using a single SPI cable.

RHD SPI Cable Adapter Board

The RHD SPI cable adapter board (Part #C3430) connects to an SPI cable and brings out all 12 power and data wires to 0.1" pitch solder holes for easy access. This board may be used to interface RHD SPI cables with prototype devices. It may also be used to connect RHD SPI signals to a commutator, as described in the application note, Adapting RHD SPI cables to a commutator (see Supporting Documents below).

Technical details on the SPI cables and connectors may be found in the RHD SPI cable/connector specification (see Supporting Documents below).

Intan RHD SPI cable adapter
RHD SPI cable adapter board connected to an SPI cable.
Intan RHD SPI cable adapter
RHD SPI cable adapter board with self-aligning 12-pin polarized nano connector.

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