Headstage Voltage Range
When using a TDT preampli
fi
er the voltage input range of the preampli
fi
er (PZ5, Subject
Interface, RA16PA) is typically lower than the headstage and must be considered the effective
range of the system. Also keep in mind that the output range of the headstage varies
depending on the power supply provided by the preampli
fi
er. PZ5 and Subject Interface supply
± 2.5 V. PZ2 and RA16PA preampli
fi
ers supply ± 1.5V. Third party preampli
fi
ers may vary. TDT
recommends using preampli
fi
ers which deliver ± 2.5 V or less. The table below lists the input
voltage ranges for the RA4LI headstage for either ± 1.5 V or ± 2.5 V power sources.
RA4LI Technical Speci
fi
cations
RA16LI - 16 Channel Headstage
The sixteen channel low impedance headstage (RA16LI) is a high quality, low- impedance
headstage designed for recording high channel count EEG's.
The RA16LI headstage is designed for low impedance electrodes and electrode caps with
input impedance between < 1 kOhm and 20 kOhm. Either headstage unit connects to the
Power Source
Headstage Input Range
± 1.5 V
± 33 mV
± 2.5 V
± 80 mV
Input referred noise
0.1 uV RMS bandwidth 300-3000 Hz
0.3 uV RMS bandwidth 2-8000 Hz
Headstage Gain
20x
Highpass Filter
2.2 Hz
Lowpass Filter
7.5 kHz
Input Impedance
1e6 ohms
Low Impedance Headstages | 5
