Xilinx ZC702 User Manual page 66

Jumper J37 can be used to select either an external voltage reference (VREF) or on-chip
voltage reference for the analog-to-digital converter.
For external measurements an XADC header (J19) is provided. This header can be used to
provide analog inputs to the XC7Z020 SoC 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 4 GPIO pins available on the XADC header as multiplexer address
lines. Figure 1-32
X-Ref Target - Figure 1-32
VADJ
Table 1-34 describes the XADC header J40 pin functions.
Table 1-34: XADC Header J40 Pinout
Net Name
VN, VP
XADC_VAUX0P, N
XADC_VAUX8N, P
DXP, DXN
XADC_AGND
XADC_VREF
XADC_VCC5V0
XADC_VCC_HEADER
VADJ
GND
XADC_GPIO_3, 2, 1, 0 19, 20, 17, 18
ZC702 Board User Guide
UG850 (v1.7) March 27, 2019
shows the XADC header connections.
XADC_VN
XADC_VAUX0P
XADC_VCC5V0
XADC_VAUX8N
XADC_DXP
XADC_VREF
XADC_GPIO_1
XADC_GPIO_3
Figure 1-32: XADC Header (J40)
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
3, 6
anti alias capacitor is not present.
Auxiliary analog input channel 8. Also supports use as I/O inputs when
7, 8
anti alias 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 VCCO supply for bank which is the source of DIO pins.
16 Digital Ground (board) Reference
Digital I/O. These pins should come from the same bank. These I/Os
should not be shared with other functions because they are required to
support 3-state operation.
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J40
1 2
3 4
XADC_VAUX0N
5 6
7 8 XADC_VAUX8P
9 10
11 12
XADC_VCC_HEADER
13 14
15 16
17 18 XADC_GPIO_0
XADC_GPIO_2
19 20
GND
XADC_AGND XADC_AGND
UG850_c1_32_030513
Description
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Feature Descriptions
XADC_VP
XADC_DXN
66