Analog I/O Wildcard User Guide
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Reference In/Out Jumper
The Reference In/Out Jumper, labeled J6, connects the reference input pin of the A/D to the reference pin on the Field Header (pin 4). Install this jumper if the reference voltage is desired on the Field Header or an external reference voltage is required to drive the A/D or the DAC.
Table 1-4 shows the valid jumper configurations for selecting the reference voltage. Jumper configurations that are not shown in the table may damage the Analog I/O Wildcard!
Table 1-4 Valid Voltage Reference Jumper Configurations
|
Installed Jumpers | Description |
|---|
| J4 & J6
| Default Configuration. Connects the 4.096 internal reference voltage to the A/D reference input pin and to the reference pin on the Field Header. The DAC must be configured to generate an internal reference of 1.024V or 2.048V. A/D input range: 0 to 4.096V. DAC output range: 0 to 2.048V or 0 to 4.096V. |
| J5 & J6
| Connects the 5.0 analog supply voltage to the A/D reference input pin and to the reference pin on the Field Header. The DAC must be configured to generate an internal reference of 1.024V or 2.048V. A/D input range: 0 to 5.0V. DAC output range: 0 to 2.048V or 0 to 4.096V. |
| J3 & J6
| Connects the DAC reference pin to the A/D reference input pin and to the reference pin on the Field Header. If the DAC is configured to generate an internal reference of 2.048V, 2.048V appears on pin 4 of the Field Header and the A/D reference input pin. A/D input range: 0 to 2.048V. DAC output range: 0 to 4.096V. If the DAC is configured to generate an internal reference of 1.024V, 1.024V appears on pin 4 of the Field Header and the A/D reference input pin. A/D input range: 0 to 1.024V. DAC output range: 0 to 2.048V. If the DAC is configured to use an external reference, the reference voltage that is supplied to pin 4 of the Field Header becomes the reference for both the A/D and the DAC. A/D input range: 0 to Vpin4. DAC output range: 0 to 2*Vpin4. |
| J3
| Connects the DAC reference pin to the A/D reference input pin. The DAC must be configured to generate an internal reference of 1.024V or 2.048V. The reference pin on Field Header is unconnected. A/D input range: 0 to 1.024V or 0 to 2.048V. DAC output range: 0 to 2.048V or 0 to 4.096V. |
| J4
| Connects the 4.096 internal reference voltage to the A/D reference input pin. The reference pin on Field Header is unconnected. The DAC must be configured to generate an internal reference of 1.024V or 2.048V. A/D input range: 0 to 4.096v. DAC output range: 0 to 2.048V or 0 to 4.096V. |
| J5
| Connects the 5.0 analog supply voltage to the A/D reference input pin. The reference pin on Field Header is unconnected. The DAC must be configured to generate an internal reference of 1.024V or 2.048V. A/D input range: 0 to 5.0v. DAC output range: 0 to 2.048V or 0 to 4.096V.
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