ISL55210-ABEVAL1Z Intersil, ISL55210-ABEVAL1Z Datasheet

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ISL55210-ABEVAL1Z

Manufacturer Part Number
ISL55210-ABEVAL1Z
Description
Amplifier IC Development Tools ISL55210 Eval Diff. Amp, Active Balun
Manufacturer
Intersil
Type
Differential Amplifiersr
Series
ISL55210r
Datasheet

Specifications of ISL55210-ABEVAL1Z

Rohs
yes
Product
Evaluation Board
Tool Is For Evaluation Of
ISL55210
Operating Supply Voltage
3.3 V
Description/function
Evaluation board to test the performance of the active balun
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Supply Current
34 mA
For Use With
ISL55210
Designer's Guide to the ISL55210-ABEVAL1Z Active
Balun Evaluation Board
Using the Active Balun Board to
Test Design Options
This relatively simple board is intended to provide a quick
means to test the performance of the active balun
configuration using the ISL55210. While all wideband, voltage
feedback (VFA), fully differential amplifiers (FDA) can perform
a single ended input to differential output operation, the
frequency span for acceptable input match (or low return loss)
is greatly enhanced by the >1.5GHz common mode loop
bandwidth internal to the ISL55210. The input and gain setting
elements for this board are very simple, while the output side
includes 3 possible output interfaces. As delivered, the
differential output is converted to single ended through a very
wideband transmission line transformer. This allows easy
response shape measurements with minimal transformer
rolloff effects. The two other output options include a 200Ω
load differential to single ended path for OIP3 measurements
with lighter loads and a differential 50Ω output path for direct
measurement of just the ISL55210 response using a 4 port
network analyzer.
While the board itself is completely flexible for input
impedance setting and gain by changing only 4 resistor
elements, the default circuit for the board as delivered
implements a 50Ω input match with a 16.4dB gain to the FDA
output pins. The simulation circuit for this configuration is
shown in Figure 1.
April 5, 2013
AN1831.0
FIGURE 1. iSim PE SIMULATION CIRCUIT FOR THE DEFAULT CONFIGURATION OF THE ACTIVE BALUN EVM
1
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
|
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
The operation of this circuit is well modeled using the spice
model for the ISL55210 within the free iSim PE simulator
The board input is C2 while the output is the balun output pin.
Only +3.3V supply is required where the ISL55210 delivers
exceptional performance using only ≈34mA supply current.
The resistors here have been snapped to 1% standard values.
To get a desired input impedance matched to R
from the input of R
element values are given by these two simple equations
(Equations 1 and 2)
The two feedback resistors should be equal and set to:
Then R
And R
get balance in the differential feedback loop. The blocking
caps are set as necessary to pass the lowest frequency of
interest. Using this simple blocking cap approach places all the
DC operating voltages on the two input and output pins at the
default internal Vcm voltage = 1.2V for the ISL55210. This
circuit can implement a DC-coupled signal path if the supplies
are set to +2.5V and -1.2V to keep the I/O headroom
requirements satisfied but that is not supported by this board
R
R
g1
f
=
=
All other trademarks mentioned are the property of their respective owners.
Av Av
----------------------------------- -
g2
g1
--------------- -
1
2 Av
(
R
+
(
will be set to the sum of R
will be set to:
S
A
----- -
2
+
v
+
4
2
)R
)
S
Copyright Intersil Americas LLC 2013. All Rights Reserved.
g1
[2]
to the differential outputs, the exact
.
Application Note 1831
g1
and the R
Author: Michael Steffes
S
S
, and gain (Av)
element to
(EQ. 1)
(EQ. 2)
[1]
.

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ISL55210-ABEVAL1Z Summary of contents

Page 1

... Designer's Guide to the ISL55210-ABEVAL1Z Active Balun Evaluation Board Using the Active Balun Board to Test Design Options This relatively simple board is intended to provide a quick means to test the performance of the active balun configuration using the ISL55210. While all wideband, voltage feedback (VFA), fully differential amplifiers (FDA) can perform ...

Page 2

... The 16.4dB gain used as the setting for the active balun evaluation board simulates very flat through 1GHz with approximately 4GHz F-3dB bandwidth for the response to the ISL55210 outputs. In fact the board shows a response shape set by the blocking capacitors on the low end and the output 24dB transformer on the high end ...

Page 3

... The supply decoupling and Vcm decoupling is the same used as for the standard ISL55210 evaluation board except R12 is reduced from 200Ω to 20Ω to reduce noise into the Vcm reference path. The optional elements (green) not populated in the board as delivered include: 1. Two capacitors on the inverting summing junctions (C5 and C6) ...

Page 4

... The high frequency rolloff follows the simulation of Figure 3 up through about 600MHz then a slight peaking in the ISL55210 response is pulling it back up. This is showing a 10.2dB midband gain to a matched load (the two series output resistors set the output impedance since the ISL55210 is a broadband low impedance output itself) with ≤ ...

Page 5

... The Noise Figure (NF) in this relatively low gain setting calculates to approximately 7dB. This low NF is depending on the low 0.85nV/√Hz differential input spot noise for the ISL55210 and the reduced resistor values enabled by this active input match capability. Going to higher gain settings will reduce the input NF where for gains > ...

Page 6

... FIGURE 10. MEASURED AND LINE FIT OIP3 FOR THE CIRCUIT OF FIGURE 1 DRIVING A DOUBLY TERMINATED 50Ω LOAD The ISL55210 does show true intercept performance on the 3rd order terms and Figure 10 is showing the expected rolloff in the intercept for this low power device as the loop gain rolls off. ...

Page 7

... References [1] These simulations are in the free Intersil Spice and power simulation package available as a download at http://www.intersil.com/content/intersil/en/tools/isim.ht ml [2] These are presented part EDN article where Part 1 is here. http://www.edn.com/design/analog/4410567/Wideband- matched-input-impedance-with-ultra-low-noise-using-the- active-match-capability-of-a-new-type-of-amplifier--part-1-of- 2-- [3] This plot actually comes from an article using this active balun stage with a bandwidth extension technique for the ADT1-1WT ...

Page 8

... ISL55210-ABEVAL1Z Bill of Materials PART NUMBER QTY UNITS ISL55210-ABEVAL1ZREVAPCB 1 ea 100X14W104MV4T C8, C11 C1608C0G1H103J C1, C2, C3, C4, C3a, C4a, C3b, C4b CAP, SMD, 0603, 0.01µF, 50V, 5%, C0G/NP0, H1044-DNP 0 ea C5, C6 H1045-00104-50V10 C7, C9, C10, C14 H1065-00105-50V10 C12 H1121-00475-10V10-B C13 108-0740-001 ...

Page 9

... ISL55210-ABEVAL1Z Bill of Materials PART NUMBER QTY UNITS H2511-049R9-1/10W1 R6b, R7b H2511-061R9-1/10W1 H2511-084R5-1/10W1 R6a, R7a H2511-DNP 0 ea R1b, R2b, RJ1a, RJ2a ADT1-1WT ADT1-1WT MABA-007871-CT1A40 5X8-STATIC-BAG 1 ea Place assy in bag LABEL-DATE CODE 1 ea AFFIX TO BACK OF PCB Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice ...

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