Digilent Arty S7 Referenzhandbuch - Seite 13
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(https://reference.digilentinc.com/_media/reference/programmable-logic/arty/arty_shield_analog_diff.png)
The pins labeled A6-A9 are connected directly to 2 pairs of analog capable pins on the FPGA via an anti-aliasing filter. This circuit is shown in Figure 9.2.2. These pairs of pins can be
used as differential analog inputs with a voltage difference between 0-1V. The even numbers are connected to the positive pins of the pair and the odd numbers are connected to the
negative pins (so A6 and A7 form an analog input pair with A6 being positive and A7 being negative). Note that though the pads for the capacitor are present, they are not loaded for
these pins. Since the analog capable pins of the FPGA can also be used like normal digital FPGA pins, it is also possible to use these pins for Digital I/O.
The pins labeled V_P and V_N are connected to the VP_0 and VN_0 dedicated analog inputs of the FPGA. This pair of pins can also be used as a differential analog input with
voltage between 0-1V, but they cannot be used as Digital I/O. The capacitor in the circuit shown in Figure 9.2.2 for this pair of pins is loaded on the Arty S7.
(https://reference.digilentinc.com/_media/reference/programmable-logic/arty/arty_shield_analog_single.png)
The XADC core within the Spartan-7 is a dual channel 12-bit analog-to-digital converter capable of operating at 1 MSPS. Either channel can be driven by any of the analog inputs
connected to the shield pins. The XADC core is controlled and accessed from a user design via the Dynamic Reconfiguration Port (DRP). The DRP also provides access to voltage
monitors that are present on each of the FPGA's power rails, and a temperature sensor that is internal to the FPGA. For more information on using the XADC core, refer to the Xilinx
document titled 7 Series FPGAs and Zynq-7000 All Programmable SoC XADC Dual 12-Bit 1 MSPS Analog-to-Digital Converter. A demo that uses the XADC core is available on the
Arty S7 resource center.
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Figure 9.2.1. Single-Ended Analog Inputs
Figure 9.2.2. Differential Analog Inputs
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