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Appendix A Specifications 97
A.5 AUX I/O Interface
The AUX I/O interface provides access to the trigger function, DAC, and TTL signals via a
rear panel connector and an AUX I/O cable that is supplied with each NIRvana-LN system.
This section provides pinout information for both the rear panel AUX I/O connector as well
as the AUX I/O Cable.
Table A-3 provides TTL signal-specifications for the AUX I/O interface.
The AUX I/O connector is located on the rear of the NIRvana-LN chassis. It is a female,
DB26, high-density connector.
Figure A-1 illustrates the pinout of the AUX I/O connector, viewed from the rear panel of
the NIRvana-LN chassis, with each contact/pin identified by its pin number.
Figure A-1: AUX I/O Connector Pinout
Table A-4 provides complete information about each AUX I/O pin and signal sorted by pin
number.
Table A-3: AUX I/O Interface TTL Signal Specifications
Parameter
Specification
Unit
Minimum Nominal Maximum
V
IN
(logic 1) 2.4 — — V
DC
V
IN
(logic 0) — — 0.9 V
DC
Rise Time

40 ns
Duration

100 ns
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
24 25 26 21 22 23 19 20
4411-0145_0050
Table A-4: AUX I/O Connector Pinout and Signal Descriptions (Sheet 1 of 3)
Pin # Signal Name Signal Description
1 TRIGGER IN 0 to +3.3V logic level input (TTL-compatible) that has a 25 k

pull-up resistor. Allows data
acquisition and readout to be synchronized with external events. Through software, positive or
negative (default) edge triggering can be selected.
2 TTL OUT 0 to +3.3V programmable logic level output (TTLcompatible). The output of this connector
can be selected and can also be inverted via the application software.
3 GND System digital ground. Any external circuitry intended to interface with the trigger control
signals must reference this ground connection.
4 DAC1 10-bit programmable output (0 – 2.5 V). 100 Ω source impedance.
5 DAC2 10-bit programmable output (0 – 2.5 V). 100 Ω source impedance.