Model AD12-8 is an 8-channel, 12-bit Analog-to-Digital converter (A/D) and counter/timer card for ISA-bus computers. The card is 7.0" long (178mm)and requires a full-size expansion slot. All connections are made through a standard 37-pin male connector. Address setup is via DIP switches on the card.
Input System Expansion
For for applications where negligible time skew between channel samples is desired, AD12-8 can be used in conjunction with Simultaneous Sample and Hold Card models SSH-xx. Further, if aliasing of the analog input signals is a consideration, then AD12-8-S03 can be used with Anti-Alias Filter Card model AAF-xx.
Discrete Digital I/O
The AD12-8 also provides sixteen bits of individually jumper-programmable digital I/O. (Note: If external AIM-16 expansion multiplexers are to be used with the AD12-8, seven of these lines are used for channel selection and gain control. Otherwise, they may be used as digital outputs.) When set as an output, power drivers provide 24 mA sink and 2.6 mA source capability.
Output Reference Voltage
Model AD12-8 also provides a precision 10 VDC (±0.1 VDC) reference voltage output which is derived from the A/D converter reference and may be used to provide sensor excitation when required. This reference voltage output is buffered and will source up to 220 mA. (Sufficient, for example, for exciting a number of strain gages.)