Xilinx KC705 User Manual page 69

X-Ref Target - Figure 1-37
U1
Dual Use IO
(Analog/Digital)
100Ω
VAUX0P
1 nF
VAUX0N
To
100Ω
Header
J46 100Ω
VAUX8P
1 nF
VAUX8N
100Ω
The KC705 board supports both the internal FPGA sensor measurements and the external
measurement capabilities of the XADC. Internal measurements of the die temperature,
VCCINT, VCCAUX, and VCCBRAM are available. The KC705 board VCCINT and
VCCBRAM are provided by a common 1.0 V supply.
Jumper J47 can be used to select either an external differential voltage reference
(XADC_VREF) or on-chip voltage reference (jumper J47 2–3) for the analog-to-digital
converter.
For external measurements an XADC header (J46) is provided. This header can be used to
provide analog inputs to the FPGA's 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.
KC705 Evaluation Board
UG810 (v1.4) July 18, 2013
FPGA
To J69.3
XADC_VCC
VCCADC
100 nF
Close to
Package Pins
XADC_AGND
GNDADC
XADC_AGND
J47
V REFP
V REFP
100 nF
Close to
Package Pins
V REFN
100Ω
V P
1 nF
V N
100Ω
DXP
DXN
Figure 1-37: Header XADC_VREF Voltage Source Options
Figure 1-38 shows the XADC header connections.
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VCCAUX
Ferrite Bead
J48
XADC_VCC Header J46
1.8V 150 mV max
U39
ADP123
Out In
Gnd
1 μF
XADC_AGND
U42
To Header J46
REF3012
V REF (1.25V)
Out In
Gnd
10 μF
Internal
Reference
Ferrite Bead
XADC_AGND
XADC_AGND
Star Grid
Connection
To
Header
J46
Feature Descriptions
AV_5V To Header J46
Ferrite Bead
J68
10 μF
100 nF 1 nF
Filter 5V Supply
Locate Components on Board
J69
XADC_VCC
J43
GND
J42
UG810_c1_30_042313
VCC5V0
69