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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
DR3e Driver/Receiver Board D-1
Appendix D
DR3e Driver/Receiver Board
DR3e Features
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Channels: 32 single-ended variable voltage or 16 differential channels
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Voltage range: -15 V to +24 V with an output swing of up to 24 V
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Relay Isolation on all I/O and AUX channels
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Provides full drive current on all channels simultaneously
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Programmable current load with dual commutating voltages
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Selectable resistive input load (8 choices) to a programmed voltage
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Selectable slew rate (0.25 V/ns to 1.3 V/ns)
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12/50 ohm selectable output impedance
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Over-current detection
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Over-voltage detection/protection
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Auxiliary channels:
– Four variable voltage
– Four LVTTL
– Four ECL (single-ended or differential)
Front Panel Connectors
The front panel of the DR3e Driver/Receiver is shown in Chapter 3.
Block Diagram
This section describes the basic hardware configuration of the DR3e
Driver/Receiver (DRA or DRB).
The DR3e is comprised of four major logic sections as shown in Figure D-1.
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Auxiliary Driver & Receiver I/O
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DR3e Driver & Receiver I/O
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Control Logic
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Firmware & NV Data