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For external measurements, an XADC header (J19) is provided. This header can be used to provide
analog inputs to the FPGA dedicated VP/VN channel, and to the VAUXP[0]/VAUXN[0],
VAUXP[8]/VAUXN[8] auxiliary analog input channels. Simultaneous sampling of Channel 0 and
Channel 8 is supported.
A user-provided analog signal multiplexer card can be used to sample additional external analog
inputs using the four GPIO pins available on the XADC header as multiplexer address lines.
Figure 1-48
X-Ref Target - Figure 1-48
XADC_VCC5V0
VCCO_VADJ
Table 1-35
Table 1-35: XADC Header J19 Pinout
Net Name
XADC_VN, _VP
XADC_VAUX0P, N
XADC_VAUX8N, P
DXP, DXN
XADC_AGND
XADC_VREF
XADC_VCC5V0
XADC_VCC_HEADER
VCCO_VADJ
GND
XADC_GPIO_3, 2, 1, 0
19, 20, 17, 18
AC701 Evaluation Board
UG952 (v1.4) August 6, 2019
shows the XADC header J19 connections.
XADC_VN
XADC_VAUX0P
XADC_VAUX8N
XADC_DXP
XADC_VREF
XADC_GPIO_1
XADC_GPIO_3
Figure 1-48: XADC header (J19)
describes the XADC header J19 pin functions.
J19 Pin
Number
1, 2
Dedicated analog input channel for the XADC.
Auxiliary analog input channel 0. Also supports use as I/O inputs when anti alias
3, 6
capacitor is not present.
Auxiliary analog input channel 8. Also supports use as I/O inputs when anti alias
7, 8
capacitor is not present.
9, 12
Access to thermal diode.
4, 5, 10
Analog ground reference.
11
1.25V reference from the board.
13
Filtered 5V supply from board.
14
Analog 1.8V supply for XADC.
15
V
supply for bank which is the source of DIO pins.
CCO
16
Digital ground (board) reference
Digital I/O. These pins come from FPGA U1 banks 15 and 16
(V
= VCCO_VADJ). The XDC constraints file I/O standard is default
CCO
LVCMOS25, assuming VCCO_VADJ = 2.5V. If VCCO_VADJ is changed from 2.5V
to 1.8V or 3.3V, the ADC file I/O standard for these nets needs to be changed to match.
www.xilinx.com
J19
1
2
3
4
5
6
XADC_VAUX0N
7
8
XADC_VAUX8P
9
10
11
12
XADC_VCC_HEADER
13
14
15
16
XADC_GPIO_0
17
18
XADC_GPIO_2
19
20
GND
XADC_AGND
XADC_AGND
Description
Feature Descriptions
XADC_VP
XADC_DXN
UG952_c1_40_101612
77
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