Board Setup - Xilinx AMS101 User Manual

Onboard Signal Source
The AMS101 card contains the Analog Devices AD5065 part, which is a dual 16-bit DAC.
This DAC can be used for one of three functions:
•
•
•
The DAC can be interfaced with the GUI. See
more details.
Signal Conditioning Circuitry
The signal conditioning function of the AMS101 evaluation card consists of an AD8033,
which functions as a gain of 2 amplifier, supplying 2.5V to the reference voltage to the
DAC.
Power Supplies
The circuitry on the AMS101 evaluation card receives 5V power through the FPGA base
board across the XADC header.

Board Setup

Because of the level of flexibility of the XADC, there are a three operating modes supported
by the AMS101 evaluation card.
•
•
•
Table 3-1: AMS101 Evaluation Card Use Cases
DAC
Onboard
Use Case
Signal
Source
Test —
1 x
2
Use Case 1—On-Board DAC (Default)
This is the most common use case and the default factory configuration of the board. In this
mode, each output of the DAC is presented to the three input channels available on the
analog header.
AMS101 Evaluation Card User Guide
UG886 (v1.3) November 6, 2013
Provide a ramp for linearity testing
Generate a sine wave for a quick dynamic performance test
Provide DC levels for common mode shifts or to provide a DC level for code
transition noise tests
Onboard DAC signal source (for AC or DC measurements)
External single-ended source
Fully differential signal source
External
Analog Simul Sampled
Source
— FFT
x
x x
Figure 3-3 illustrates the high level circuit diagram for this use case.
www.xilinx.com
Signal Source Configuration, page 40
Table 3-1 details these operating modes:
Uni-polar
INL FFT
x x
x
Board Setup
Bi-polar
INL FFT
x x
x
for
INL
x
31