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ISLA214P20 Datenblatt(PDF) 6 Page - Intersil Corporation

Teilenummer ISLA214P20
Bauteilbeschribung  Ultra High Performance Broadband 12 to 16-Bit Data Acquisition Platform
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Hersteller  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISLA214P20 Datenblatt(HTML) 6 Page - Intersil Corporation

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Application Note 1837
6
AN1837.0
May 3, 2013
of 5.6V/V yields a 5.7nV/√Hz differential spot noise. Combining
this with the various noise elements within the ISLA214P50 will
give a slight degradation in the resulting SNR in the FFT. Those
calculations are described in this article: “Deliver the lowest
distortion and noise in a low power, wideband, ADC interface –
Part 2 of 4”
http://www.planetanalog.com/document.asp?doc_id=528177
The second ADTL1-12 common mode choke transformer
provides a very broadband, low insertion loss, element that
forces balance in this differential signal path. Testing with and
without this element showed a significant improvement in the
FDA output 2nd harmonic distortion at higher frequencies. This is
an optional element in the design and can be bypassed with the
optional shorts, but the best SFDR will be achieved with this
element included as it is in the standard board build.
ELEMENTS CONTRIBUTING TO THE PASSBAND
FLATNESS AND HIGHER FREQUENCY CUTOFF
Each of the elements in the signal path have fine scale rolloffs
that need to be considered to achieve the final ±0.8dB flatness
through the 100kHz to 100MHz intended digitizer range for this
example design board.
The ADT4-6T input transformer was selected mainly for its low
frequency performance. While specified as -1dB flat from
150kHz to 200MHz, typical devices measure to have a -1dB
flatness span when driven from a 50Ω source to a 200Ω load of
40kHz to 180MHz. This far exceeds the Mini-Circuits specified
flatness region on the low frequency side which is very typical for
these wideband baluns.
Figure 5 shows a comparison to measured and modeled
transformer response with a 50Ω source to 200Ω load. Since
there is limited data at low frequencies in the vendor data sheet,
no comparison is made to that.
The measured curve is showing about -0.5dB at 100kHz and
-0.3dB at 100MHz. The Spice model (used in subsequent
simulations) is only attempting to match the high and low F-3dB
frequencies and the midband gain including the measured 0.2dB
insertion loss. That modeling approach is described in this
article: “Measuring and modeling wideband baluns for
application to ADC input stages”
http://www.planetanalog.com/author.asp?section_id=434&doc
_id=558824&
For a higher frequency range design, the MA/COM
MABA-0096-CF48A0 measures in the same configuration to have a
-0.5dB flatness span from 300kHz to 220MHz typically which would
make it a good choice for 1MHz to 200MHz analog input span.
The ADT1-12 common mode choke following this actually has
0dB insertion loss in this configuration at low frequencies. This
increases to -0.2dB midband with a -1dB point at >1GHz with
these higher 200Ω source and load impedances used at this
point in the signal chain.
The amplifier will have its own frequency response from these
source impedances and gain settings. Having good simulation
models for each of the elements in the design allow easy
comparisons of options. Setting up an iSim PE circuit for the
input stage of Figure 4 gives a simulation circuit of Figure 6.
FIGURE 5. ADT4-6T RESPONSE CURVES
3.0
3.5
4.0
4.5
5.0
5.5
6.0
100k
1M
10M
100M
1G
MEASURED
MODELED
FREQUENCY (Hz)
FIGURE 6. SIMULATION CIRCUIT FOR THE INPUT STAGE PART OF THE ISLA214P50-55210EV1Z BOARD


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