Xadc Analog-To-Digital Converter - Xilinx VC707 User Manual

XADC Analog-to-Digital Converter

7 series FPGAs provide an analog front end XADC block. The XADC block includes a dual
12-bit, 1 MSPS analog-to-digital convertor (ADC) and on-chip sensors. See 7 Series FPGAs
XADC Dual 12-Bit 1MSPS Analog-to-Digital Converter User Guide
on the capabilities of the analog front end.
X-Ref Target - Figure 1-34
U1
Dual Use IO
(Analog/Digital)
100Ω
VAUX0P
1 nF
VAUX0N
To
100Ω
Header
J49 100Ω
VAUX8P
1 nF
VAUX8N
100Ω
The VC707 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 VC707 board VCCINT and
VCCBRAM are provided by a common 1.0 V supply.
Jumper J42 can be used to select either an external differential voltage reference (VREF) or
on-chip voltage reference for the analog-to-digital converter.
VC707 Evaluation Board
UG885 (v1.4) May 12, 2014
J43
FPGA
To J54.3
XADC_VCC
VCCADC
100 nF
Close to
Package Pins
XADC_AGND
GNDADC
XADC_AGND
V REF (1.25V)
J42
V REFP
V REFP
100 nF
Close to
XADC_AGND
Package Pins
V REFN
100Ω
V P
1 nF
V N
100Ω
DXP
DXN
Figure 1-34: XADC Block Diagram
www.xilinx.com
Figure 1-34 shows the XADC block diagram.
VCCAUX
Ferrite Bead
XADC_VCC Header J49
1.8V 150 mV max
U10
ADP123
Out In
10 μF
Gnd
1 μF
XADC_AGND
U35
To Header J19 J54
REF3012
Out In
Gnd
10 μF
Internal
Reference
Ferrite Bead
XADC_AGND
Star Grid
Connection
To
Header
J19
Feature Descriptions
(UG480) [Ref 10] for details
AV_5V To Header J19 VCC5V0
Ferrite Bead
J53
100 nF 1 nF
Filter 5V Supply
Locate Components on Board
XADC_VCC
J10
GND
J9
UG885_c1_31_030512
Send Feedback
75