TBSI 8 Channel Tethered Gain 2, 20 and 100 Headstages

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Product Code: Product26
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Triangle BioSystems, Int’l. offers a family of 8-channel analog headstage subassemblies that are used to provide a wired connection between implanted electrodes and neural recording and analysis equipment. The main function of the headstage is to precondition the neuron pulse signals and provide a buffered connection over a low impedance cable. Each headstage design is based on a custom, low power VLSI developed by TBSI. The result is a solution with superior performance in a very small form-factor with less weight.

The 8-channel headstages are available with gain of 2, 20 and 100. An all headstages include a selectable bandpass filter. A gain 1000 is also available that is the size and weight of the 16 channel headstage

 

Available Grounding and Referencing Connections for T8G2 Headstage:

ACGND: Connect your animal ground to ACGND (see pinout diagram on pg2) of the headstage. This is typically connected to earth or system ground (which is 0V potential) of the recording system.

CH9: This is an extra recording channel that can be used as a common mode reference signal for external preamplifiers. This common mode reference channel is useful for removing animal movement artifacts or any other common mode noise found at the headstage input pins.

 

Features

Headstage Features

• Custom VLSI circuit provides small size & reduced weight

• Weight < 0.9 grams

• 9 channels (8ch plus 1 reference)

• Available with gain of 2

• Unity gain ground buffer output

• Selectable bandpass filtering per channel

• ± 1.65V/±2.5V operation

• Size for Gain 2:

5x18x17mm for 50mil Input Omnetics

5x12x12mm for 25mil Input Omnetics

8 Channel Gain 2 Tethered Headstages Specifications

Parameter             Min    Typ    Max    Units    Notes

Power Supply

±1.65 volt supply       3.0     3.3     3.6    Volts   3.3V Bipolar power supply (± 1.65V)

Average Icc             5.6     6.1     6.7    mA

±2.5 volt supply        4.5      5      5.5    Volts   5V Bipolar power supply (± 2.5V)

Average Icc             6.8     7.5     8.5    mA

Analog Channel

Input voltage range (±2.5v)  -1.2    0      1.8    Volts     For 5v Bipolar power supply

Input voltage range (±1.65v)  -.6            .8    Volts     For 3.3v Bipolar power supply

Common mode center             0            Volts     For bipolar power supplies only

dc Offset                 -10     0      10   mVolts    For bipolar power supplies only

Gain 2                   1.9     2      2.1             Factory selectable gain

Gain 20                  19     20      21             Factory selectable gain

Gain 100                 95     100     105            Factory selectable gain

Gain 1000                950    1000    1050           Factory selectable gain

G2 BW @ ±2.5V            .8            120     kHz        -3dB input signal level BW

G20 BW @ ±2.5V           .8            150     kHz        -3dB input signal level BW

G100,G1000 BW @ ±2.5V     .8            22      kHz        -3dB input signal level BW

Input impedance                  22            Mohms               At 1kHz

Output impedance                158            ohms                At 1kHz

Input referred noise               5.7          μVrms        for DC - 10khz frequency with all inputs grounded

THD                                   -63      dB       @ 5kHz and 1V p-p input

Phase Delay                       30           uSecs      @ 5 kHz input

Settling Time                      5.5           uSecs         With 1V step input

Mechanical Specs

Length                           15            mm    Edge to Edge of connector pins

Width                           14             mm

Height                           3.0            mm

Weight                                 .8       grams

Miscellaneous

Reference Bias Current               78             uA       Included inside headstage

Junction Temperature       -40      25     100     C

 

 

8 Channel Tethered Gain 20 and 100 Headstages Specifications

Parameter             Min    Typ    Max    Units    Notes

Power Supply

±1.65 volt supply       3.0     3.3     3.6    Volts   3.3V Bipolar power supply (± 1.65V)

Average Icc             5.6     6.1     6.7    mA

±2.5 volt supply        4.5      5      5.5    Volts   5V Bipolar power supply (± 2.5V)

Average Icc             6.8     7.5     8.5    mA

Analog Channel

Input voltage range (±2.5v)  -1.2    0      1.8    Volts     For 5v Bipolar power supply

Input voltage range (±1.65v)  -.6            .8    Volts     For 3.3v Bipolar power supply

Common mode center             0            Volts     For bipolar power supplies only

dc Offset                 -10     0      10   mVolts    For bipolar power supplies only

Gain 20                  19     20      21             Factory selectable gain

Gain 100                 95     100     105            Factory selectable gain

Gain 1000                950    1000    1050           Factory selectable gain

G20 BW @ ±2.5V           .8            150     kHz        -3dB input signal level BW

G100,G1000 BW @ ±2.5V     .8            22      kHz        -3dB input signal level BW

Input impedance                  50            Mohms               At 1kHz

Output impedance                158            ohms                At 1kHz

Input referred noise               5.1          μVrms        for DC - 10khz frequency with all inputs grounded

THD                                   -63      dB       @ 5kHz and 1V p-p input

Phase Delay                       30           uSecs      @ 5 kHz input

Settling Time                      5.5           uSecs         With 1V step input

Mechanical Specs

Length                           15            mm    Edge to Edge of connector pins

Width                           14             mm

Height                           3.0            mm

Weight                                  .8      grams

Miscellaneous

Reference Bias Current               78             uA       Included inside headstage

Junction Temperature       -40      25     100     C