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S16A User’s Guide Hardware Interface
EDT, Inc. October, 1996 23
Hardware Interface
This section describes how to connect your device to an S16A interface, including the electrical
characteristics of the signal, the signal descriptions, the timing specifications, and the connector pinout.
Electrical Interface
The two S16A analog inputs each have the following characteristics:
• 100 KOhm impedance
• configurable input sources:
· differential input signals
· either of the two differential leads (“plus” and “minus”) as a single-ended signal
· either of the analog outputs
· ground
• base input range: -2.5 to +2.5 volts
• input gain adjustments ranging from 1 to 100 power, in 7 steps
• offset and gain trim adjustments
The S16A analog outputs have the following characteristics:
• low impedance (70 Ohm)
• single-ended (non-differential) signals
• 20-bit precision
• range from -2.5 to +2.5 volts
• separate adjustable level offsets.
The S16A also provides 12 general-purpose I/O pins, each of which can be configured as either input or
output. The outputs are TTL-level, high-impedance (1 KOhm); the inputs are TTL-level (0–5 volt)
compatible.