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Model B0205F50200AHF
Rev A
Ultra Low Profile 1608 Balun
50Ω to 200Ω Balanced
Description
The B0205F50200AHF is a low profile sub-miniature balanced to unbalanced
transformer designed for differential input locations on data conversion devices (A to
D converters). In an easy to use surface mount package covering 200 MHz to 500
MHz and superior CMRR performance, this transformer is optimized to offer
improved SFDR management during operation of the data converter device. The
B0205F50200AHF is ideal for high volume manufacturing and is higher performance
and smaller form factor than traditional wire wound transformers. The
B0205F50200AHF has an unbalanced port impedance of 50Ω and a 200Ω balanced
port impedance. This transformation enables single ended signals to be applied to
differential ports on the data converter devices. The output ports have equal
amplitude (-3dB) with 180 degree phase differential. The B0205F50200AHF is
available on tape and reel for pick and place high volume manufacturing.
Detailed Electrical Specifications: Specifications subject to change without notice.
ROOM (25°C)
Features:
125 –700 MHz (IL 3dB BW)
200 – 500 MHz (IL 1dB BW)
0.83 mm Height Profile
50 Ohm to 2 x 100 Ohm
Excellent CMRR
Parameter
Frequency
Unbalanced Port Impedance
Balanced Port Impedance
Return Loss
Min.
200
13.9
Typ.
50
200
17.7
Max
500
Unit
MHz
dB
Input to Output DC Isolation Insertion Loss*
1.3 1.6
dB
Surface Mountable
Tape & Reel
Non-conductive Top Surface
RoHS Compliant
Halogen Free
Amplitude Balance
Phase Balance
CMRR
Power Handling
Operating Temperature
* Insertion Loss stated at room temperature (Insertion Loss is approximately 0.1 dB higher at +85 ºC)
Outline Drawing
-55
0.1
1.3
38.2
0.4 dB
3.1 Degrees
dB
2 Watts
+85 ºC
Top View (Near-side)
Side View
Bottom View (Far-side)
4.10±.10
.89±.08
4x .955
1 23
10 4
2.10±.10
9 2x .350
4x .280
4x .350
5
Orientation
Marker
Mechanical Outline
Dimensions are in Millimeters
Pin Designation
1 Input
2 NC
3 Open
4 GND
5 GND
Orientation
Marker
Pin Designation
6 Balanced port 1
7 NC
8 Balanced port 2
9 GND
10 GND
10x .300
10x .220
876
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www.anaren.com
USA/Canada:
Toll Free:
Europe:
Asia:
(315) 432-8909
(800) 411-6596
+44 2392-232392
+86 512-62749282

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Model B0205F50200AHF
Rev. A
Typical Broadband Performance: 0 - 8.0 GHz.
Return Loss - Input
0
-3
-6
-9
-12
-15
-18
-21
-24
-27
-30
-33
-36
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
Frequency [MHz]
Amplitude Balance
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
20
15
10
5
0
-5
-10
-15
-20
Frequency [MHz]
CM RR
-2
-5
-8
-11
-14
-17
-20
-23
-26
-29
-32
-35
-38
-41
-44
-47
-50
Frequency [MHz]
Insertion Loss
Frequency [MHz]
Phase Balance
Frequency [MHz]
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Toll Free:
Europe:
Asia:
(315) 432-8909
(800) 411-6596
+44 2392-232392
+86 512-62749282

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Typical Performance: 100 MHz. to 600 MHz.
Return Loss - Input
0
-3
-6
-9
-12
-15
-18
-21
-24
-27
-30
-33
-36
Frequency [MHz]
Amplitude Balance
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
Frequency [MHz]
CM RR
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
Frequency [MHz]
Model B0205F50200AHF
Rev A
Insertion Loss
0
-0.3
-0.6
-0.9
-1.2
-1.5
-1.8
-2.1
-2.4
-2.7
-3
-3.3
-3.6
Frequency [MHz]
Phase Balance
20
15
10
5
0
-5
-10
-15
-20
Frequency [MHz]
Visit us at
www.anaren.com
USA/Canada:
Toll Free:
Europe:
Asia:
(315) 432-8909
(800) 411-6596
+44 2392-232392
+86 512-62749282

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Model B0205F50200AHF
Rev. A
Application in ADC Frontend:
Modern Analog-to-Digital Converter (ADC) system often uses differential architecture to suppress the even-order
harmonics, minimize noise interference and keep dynamic range high. The performance of ADC system is heavily
influenced by amplitude and phase imbalances arising from the ADC frontend, especially in high frequency
applications. Anaren’s multi-layer balun B0205F50200AHF offers superb amplitude and phase balance performance
over wide frequency range, translating to excellent SFDR performance of the ADC system. B0205F50200AHF is a
ferrite free design eliminating related inter-modulation and other non-linear effects. B0205F50200AHF has impendence
transforming ratio of 1:4 with voltage gain of 6dB higher than 1:1 balun, which reduces the input drive requirement.
Anaren’s highly repeatable manufacturing process results in little part to part variation, ensuring consistent
performance in production.
A typical ADC front end application is shown below. In conjunction with many high speed ADC ICs, bandwidth of
100MHz to 250MHz can be obtained for -1dB ripple of gain flatness. R1 and R2, in shunt with the input impedance of
ADC, supply the balun with required differential load. The series resistors, R5 and R6 are used to limit the amount of
charge injection from the unbuffered ADC back into the analog input. Optional RC circuits, R3, R4, C4 and C5 further
improve SDFR in many circumstances by supplying an additional current path to neutralize the charge injection. These
values are also chosen to limit or extend the ADC application bandwidth.
ADC frontend schematic for IF 100 MHz to 250MHz
using B0205F50200AHF
A low frequency solution can be realized by adding additional tuning components C6, L1 and L2. The -1dB ripple of
gain flatness is achieved for IF band of 50MHz to 110MHz.
ADC frontend schematic for IF 50MHz to 110MHz
using B0205F50200AHF
Visit us at
www.anaren.com
USA/Canada:
Toll Free:
Europe:
Asia:
(315) 432-8909
(800) 411-6596
+44 2392-232392
+86 512-62749282

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Model B0205F50200AHF
Rev A
Mounting Configuration:
In order for Xinger surface mount components to work optimally, the proper impedance transmission lines must be
used to connect to the RF ports. If this condition is not satisfied, insertion loss, Isolation and VSWR may not meet
published specifications.
All of the Xinger components are constructed from organic PTFE based composites which possess excellent
electrical and mechanical stability. Xinger components are compliant to a variety of ROHS and Green standards and
ready for Pb-free soldering processes. Pads are Gold plated with a Nickel barrier.
To supply common mode voltage offset to the analog-to-digital converter, DC blocking capacitors are
needed at the balanced port (pins 6 & 8).
An example of the PCB footprint used in the testing of these parts is shown below. In specific designs, the
transmission line widths need to be adjusted to the unique dielectric coefficients and thicknesses as well as varying
pick and place equipment tolerances.
.21 4x
1.01 2x
.89 4x
4.02
Plated thru
hole(s) to
Ground
Circuit Pattern
Footprint Pad (s)
Solder Resist
Dimensions are in Millimeters
Mounting Footprint
.29 6x
.36 10x
1.66 2x
3x
Transmission
Line
PART ORIENTATION (TOP VIEW)
.29 10x
Visit us at
www.anaren.com
USA/Canada:
Toll Free:
Europe:
Asia:
(315) 432-8909
(800) 411-6596
+44 2392-232392
+86 512-62749282