TDT RZ2 Manual page 306

6-98
TB32 Features
Analog Acquisition Channels
The TB32 acquires signals using 16-bit sigma-delta As, which provide superior
conversion quality and extended useful bandwidths, at the cost of an inherent fixed
group delay. Each converter has a two-pole anti-aliasing filter (12 dB per Octave)
at 4.5 kHz.
Note: The TB32 16-bit sigma-delta A/D converters contain a 20 sample group delay.
Scale Factor
To determine the actual biopotential from the TB32, two scale factors should be
applied in the DSP. The first scale factor is 400. This is used to convert the input
from the TB32 into the standard voltage range expected by the DSP. The second
scale factor is used to scale the signal according to the amplification of the TBSI
headstage and receiver.
This can be simplified into a single conversion of 400/ G
Where G
Headstage Connector
The headstage connector is a 37-pin
(31-channel) female connector.
Information on the pin inputs is provided
with "TB32 Digitizer Technical
Specifications" on page 6-99.
Base Station Connectors ‐ To Base
One end of the fiber optic cable
connects to the digitizer and the
other end connects to the digitizer
(amplifier) input on the base
station. Two fiber optic base
station connectors are provided.
Connect each fiber optic cable as
shown below.
Each connector on the TB32 is
labeled and corresponds to the
channels of the wireless
headstage. Refer to the System 3
Manual for specific device channel
configurations.
Power Switch
A switch on the front panel powers up the digitizer. The power light and fiber
connectors at the left will be illuminated when the digitizer is on.
TB32 32-Channel Digitizer
= Gain of TBSI wireless headstage and receiver
TBSI
TBSI
Digitizer Output Base Station Connector
to Base Station for Digitizer Input
System 3