Overview

The D168 is a fully differential 8 channel preamplifier intended for DC or AC coupled recordings via tethered telemetry.  The D168 measures 38mm x 17mm x 5mm and is suitable for use with larger rodents.  By default, the standard headstage is configured for 8 DC channels, but can be customised with one or two AC-coupled channels for signals where DC coupling is not required (e.g. ECG or EMG).

The D168 is particularly suitable for multi-modal recordings, including local field potentials (LFP’s), electroencephalography (EEG), electrocorticographay (ECoG), electromyography (EMG), electrocardiography (ECG) and thermocouple-based temperature monitoring.

Components of a Complete Recording System

Use of the D168 preamplifier requires a dedicated output cable (D168-OP) and the NL166 Interface Module (housed in our NL905 or NL900D NeuroLog System rack).  Signals must also be further amplified by a pair of NL530 Signal Conditioners (four channels each), modified (SM402) to increase their maximum gain to x100.  The analogue outputs from the pair of NL530’s can be passed to any commercial DAQ interface featuring an adequate number of ADC inputs, but we recommend the Cambridge Electronic Design Power 1401 ADC interface and Spike2 software.

Specifications

• Channels:  8, fully differential
• Gain:  x100
• Bandwidth:  DC to ~290kHz
• Input impedance:  100 Gohm
• Noise:  7 nV/√Hz RTI
• Input Protection:  Up to ±40V
• CMRR:  >132 dB
• Input Bias:  < 0.5 nA
• Dimensions:  38 x 17 x 5 mm
• Connectors
  • Input – 20-pin dual row. 16 for input signals, 2 for COM, 2 for 10k resistors to COM
  • Output – 16-pin dual row. 8 for signals, 6 for COM, 2 for power. 3 pins are blocked for location each are female “Mill-Max” gold plated connector on 0.050” spacing
• Options:  One or two channels can be AC couple at the factory during manufacture

PUBLICATIONS