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ISLA214P20 датащи(PDF) 2 Page - Intersil Corporation

номер детали ISLA214P20
подробное описание детали  Ultra High Performance Broadband 12 to 16-Bit Data Acquisition Platform
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производитель  INTERSIL [Intersil Corporation]
домашняя страница  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISLA214P20 датащи(HTML) 2 Page - Intersil Corporation

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Application Note 1837
2
AN1837.0
May 3, 2013
OPERATING PRECAUTIONS:!!
IT IS STRONGLY RECOMMENDED TO INSERT THE +5V PLUG AT
THE MOTHERBOARD PRIOR TO PLUGGING IN THE AC ADAPTER
TO REDUCE THE POSSIBILITY OF POWER SURGES WHICH CAN
DAMAGE THE PCB. PROBING ON THE PCB SHOULD BE DONE
WITH CARE USING PROPER ESD TECHNIQUES WHILE HANDLING.
Hardware Description
There are two components in the hardware portion of the
evaluation platform. The daughtercard and the motherboard
(Figure 1). The FDA and ADC are on the daughtercard, which
accepts power from the motherboard and contains the analog
input circuitry, clock interface, and supply decoupling. The
daughtercard interfaces to the motherboard through a
mezzanine connector. The motherboard contains a USB
interface, an FPGA and SRAM. The motherboard serves as the
interface between the host PC and the ADC daughtercard. Most
of the ADC functionality is controlled through the motherboard by
the Konverter software. The FPGA accepts output data from the
ADC and buffers it to the SRAMs before passing it to the PC at
the lower data rate required for post-processing. The maximum
buffer depth is approximately one million words.
The designer must supply a low jitter RF generator for the clock
input to achieve the SNR reported here. Some possible options
are shown in “Appendix A: Low Phase Noise RF Generators” on
page 15. An alternate to a signal generator for fixed 500MSPS
clock rates would be the 3.3V supply, SMA barrel, RFPRO33-500
from Crystek. A slight degradation in SNR might be expected
using this device vs the best low phase noise RF signal
generators and a bandpass filter on the clock. Using a bandpass
filter on the clock will reduce clock jitter and improve SNR while
using a bandpass on the signal source is normally required to
eliminate harmonics while testing the board performance. Most
RF generators that might be used as a test analog input source
have very poor harmonic distortion and require a bandpass
postfilter to see the full performance of the ADC’s FFT.
Software Description
The software component is the Konverter Analyzer, a graphical
user interface (GUI) created with MATLAB™. A MATLAB
Component Runtime engine is supplied, which executes a
compiled version of the m-files. Therefore, a separate version of
MATLAB is not required to run the Konverter Analyzer.
The GUI controls the ADC configuration through its SPI port, reads
data from the motherboard and performs the post-processing and
display of digitized data. Data can be viewed in either the time or
frequency domain, and can be saved for later processing. Critical
performance parameters such as SNR, SFDR, ENOB, etc. are
calculated and displayed on the screen when FFT output is
selected and a dominant single frequency is being applied.
Initial Start-Up
Referring to Figure 3, connect the daughtercard to the
motherboard by aligning the two matching mezzanine connectors.
Four screws on the motherboard align with the mounting holes on
the daughtercard. Next, connect the clock source (≈12dBm level
into 50Ω) which will be required for communication to the
Konverter software. Then connect a test source or signal of interest
coming from your signal channel at a maximum input level
<350mVP-P (or <-5.1dBm for single tone). With the RF signal
generators delivering a clock and input signal to the daughtercard,
and the +5V supply jack plugged into the motherboard, plug the
AC power plug into a wall socket. The daughtercard is powered
from linear regulators on the motherboard through the mezzanine
connector. The USB cable should now be connected from the
motherboard to the PC. Be sure to use the same USB port that was
originally used when the Konverter software was installed on the
PC to insure it is recognized. Now launch the Konverter software on
the PC where it should recognize the motherboard and proceed to
taking an FFT.
Motherboard
The only connections to the motherboard are the +5V supply power
and the USB cable to the PC with the Konverter software loaded.
No additional configuration of the motherboard is required. IT IS
STRONGLY RECOMMENDED TO INSERT THE +5V PLUG AT THE
MOTHERBOARD WITH THE DAUGHTERBOARD ATTACHED PRIOR
TO PLUGGING IN THE AC ADAPTER TO REDUCE THE POSSIBILITY
OF POWER SURGES WHICH CAN DAMAGE THE PCB. PROBING ON
THE PCB’S SHOULD BE DONE WITH CARE AND PROPER ESD
PROCEDURES USED WHEN HANDLING THE BOARDS.
FIGURE 1. TYPICAL CHARACTERIZATION SETUP USING THE INTERSIL KMB-001 MOTHERBOARD AND KONVERTER SOFTWARE
Low-Jitter
RF Generator
Clock Inputs
Analog Input
Low-Jitter
RF Generator
10MHz
Reference
Mezzanine
Connector
USB
To Host PC
Analog Input
Clock
(200-500MHz)
REF
IN
REF
OUT
Motherboard
KMB001
USB
+5V
FPGA
SRAM
SRAM
ADC
Daughter
Card
Optional
Attenuator
AMP
Optional
Measurement
Port
Test
Bandpass
Filter


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