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ISLA216P13 Datasheet(PDF) 5 Page - Intersil Corporation

No. de pieza ISLA216P13
Descripción Electrónicos  Ultra High Performance Broadband 12 to 16-Bit Data Acquisition Platform
Download  25 Pages
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISLA216P13 Datasheet(HTML) 5 Page - Intersil Corporation

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Application Note 1837
5
AN1837.0
May 3, 2013
INPUT SIDE CIRCUIT DESIGN AND OPTIONS
As delivered, the interface uses an input transformer that is very
flat to low frequencies followed by a common mode choke
transformer that is a DC short for biasing with <0.3dB insertion
loss to >1GHz for the differential signal. Either may be removed
and replaced by shorts or resistor elements using the bypass
resistors.
The input signal is coupled through a 1μF blocking cap (to protect
against accidental DC shorts) to an input step up transformer
and then directly into a common mode choke transformer. The
1:2 turns (1:4Ω) ratio step up transformer offers many
advantages combined with an FDA as shown here. The second
transformer provides a differential signal short but a common
mode open circuit. Differentially, the two 100Ω gain resistors
appear directly at the output of the input step up transformer.
Briefly, the 2-100Ω series resistors feed into a differential virtual
ground at the FDA summing junctions (R1009&R1010 in
Figure 4) and form a 200Ω differential termination impedance
for the ADT4-6T. That is input referred as a broadband 50Ω
termination impedance out of the 1μF blocking cap. Scaling
these resistors up, while still maintaining a 200Ω secondary
termination, can be done using the Rterm1 element. This is
sometimes useful at lower gain targets to allow the feedback
resistors (R1008 & R1011) to be scaled up when they might be
adding significant loading to the output stage of the ISL55210.
Detailed specifications for 4GHz gain bandwidth product,
0.85nV/√Hz input noise ISL55210 may be found at:
http://www.intersil.com/products/ISL55210
The ISL55210 provides duplicates of the differential outputs on
the input side for tighter signal path layout. The feedback
resistors are the 2 -500Ω elements where the connection back
into the inverting summing junctions are the 0Ω elements.
Neglecting transformer insertion losses, the gain from the input
port to the amplifier outputs should be 2 (in the first transformer)
X 5 (in the FDA) = 10 (or 20dB). The ADT4-6T was selected
primarily for its excellent flatness and distortion down to 100kHz.
Its measured response showed a -1dB flatness span from 40kHz
to 178MHz when driven from 50Ω to 200Ω load with a -0.18dB
midband insertion loss. This is a suitable frequency span for the
intended 100kHz to 100MHz digitizer bandwidth in this board. It
does show a bit of rolloff at 100MHz which is partially equalized
by the 10pF capacitors to ground at the summing junctions in
Figure 4. Adding those capacitors does start to peak the output
noise of the ISL55210, but this stage will be followed by a
passive filter rolling that noise off. A detailed discussion of the
input referred noise figure for this transformer coupled FDA
topology may be found at:
http://www.edn.com/design/analog/4400484/Accurately-
predict-measured-noise-figures-for-transformer-coupled-
differential-amplifiers--Part-1-of-2--
For the default configuration on this ISLA214P50-55210EV1Z
board using the components shown in Figure 4, the estimated
noise figure will be 7.2dB from a 50Ω source. Converting that to
an input referred spot noise voltage including a 50Ω source noise
gives a very low 1.02nV/√Hz. This is only for the amplifier stage,
and not including any noise in the original source signal.
Delivering this to the ADC inputs through the full signal path gain
FIGURE 4. AMPLIFIER POWER SUPPLY DECOUPLING AND INPUT SIGNAL UP TO THE AMPLIFIER INPUTS


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