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ISLA212P13 Folha de dados(PDF) 11 Page - Intersil Corporation

Nome de Peças ISLA212P13
Descrição Electrónicos  Ultra High Performance Broadband 12 to 16-Bit Data Acquisition Platform
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Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISLA212P13 Folha de dados(HTML) 11 Page - Intersil Corporation

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Application Note 1837
11
AN1837.0
May 3, 2013
COMBINED FFT PERFORMANCE FOR THE INPUT
INTERFACE CIRCUIT AND THE ADC
The starting point for the dynamic range of the
ISLA214P50-55210EV1Z board would be the reported
performance of the ADC only in its typical 2-transformer input
evaluation board circuit. The typical ADC only EVM is described
here:
http://www.intersil.com/content/dam/Intersil/documents/isla/
isla214ir72ev1z_schem_layers.pdf
While the ISLA214P50 data sheet is available here:
http://www.intersil.com/content/dam/Intersil/documents/fn75
/fn7571.pdf
The SNR shown in Figure 2 from the ADC data sheet (and
repeated here) is actually SNRFS.
Combining the information in these plots along with the
specification table suggests the following typical numbers for the
ADC only up through 100MHz inputs:
1. SNRFS ≈ 72.6dB
2. SFDR ≈ 82dBc to 84dBc
3. HD2 ≈< -84dBc
4. HD3 ≈< -80dBc
The SNRFS will certainly drop from this 72.6dB by some amount
due to the added integrated noise presented to its inputs over a
simple transformer input test. The HD2 and HD3 will show a
complex result when combined with the ADC where that testing
will be done here at -2dBFS. Recognizing that the midrange input
frequencies will get little interstage filter help on the HD2 and
HD3 terms, the 40MHz FFT of Figure 16 is showing that the
intrinsic dynamic range up to the FDA outputs is so good as to
produce almost no degradation in ADC only operation.
For this 283mVP-P single tone input at 40.07MHz that is
bandpass filtered and delivered to the SMA input, the:
1. SNRFS has dropped from 72.6dBc to 71.9dBc
2. SFDR is bit better than typical at 89dBc vs the ADC only
82dBc to 84dBc
3. HD2 has improved to -89dBc from ADC only of approximately
-85dBc
4. HD3 has improved to -93dBc from a typical -88dBc looking at
Figure 15 at 40MHz
Testing two boards for swept input frequency SNRFS gives the
plot of Figure 17 where the result has dropped about 1dB from
the ADC only data.
The swept frequency HD2 performance actually improves slightly
over the ADC only plots. This might be attributed to the -2dBFS
target but certainly shows no degradation using the very high
dynamic range input interface circuit implemented on this board.
The swept frequency HD3 also seems slightly improved over the
typical ADC only plots.
These plots are showing some degradation in SNRFS, and a
slight improvement on the HD2 and HD3 performance. Here,
however, the -2dBFS input level is only 283mVP-P at board edge
vs a much higher level for the typical ADC characterization
circuit. The harmonic distortion performance is the combined
result of many elements in the design. Hence, it is very difficult to
make too strong a claim on the worst case distortion. The limited
testing here seems to indicate a <-80dBc performance is
certainly being delivered where even <-85dBc seems possible.
While the signal path circuit here may seem a bit involved, it is
converting from single ended input and delivering a bandlimited
response to the ADC with precise common mode control and
exceptionally low noise and distortion using <120mW total.
Since the FFT’s are showing nearly as good performance as the
ADC itself, this solution is equivalent to a 14-bit, 500MSPS ADC
requiring only 300mVP-P single ended input for -1dBFS.
FIGURE 14. SNRFS AND SFDR vs FIN USING 500MSPS CLOCK
AND TARGETING -1dBFS
And then the swept frequency on just those HD2 and HD3 terms
from Figure 3 in the ISLA214P50 data sheet.
FIGURE 15. HD2 AND HD3 vs FIN USING 500MSPS CLOCK AND
TARGETING -1dBFS
55
60
65
70
75
80
85
90
95
0
100
200
300
400
500
600
SFDR
SNR
SFDR (EXCLUDING H2, H3)
INPUT FREQUENCY (MHz)
-95
-90
-85
-80
-75
-70
-65
-60
-55
0
100
200
300
400
500
600
HD2
HD3
INPUT FREQUENCY (MHz)


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