BD2425N50ATI
Rev C
Ultra Low Profile 0404 Balun
For TI transceiver CC2500
50Ω to 127+j34Ω Balanced
(TTM Application Note Ann-2003)
Description:
The BD2425N50ATI is a low cost, low profile sub-miniature
unbalanced to balanced transformer designed for differential inputs
and output locations on modern chipsets in an easy to use surface
mount package. The BD2425N50ATI is ideal for high volume
manufacturing and delivers higher performance than traditional
ceramic baluns. The BD2425N50ATI has an unbalanced port
impedance of 50Ω and 127+ j34Ω balanced port impedance. This
transformation enables single ended signals to be applied to
differential ports on modern integrated chipsets. The output ports
have equal amplitude (-3dB) with 180 degree phase differential. The
BD2425N50ATI is available on tape and reel for pick and place high
volume manufacturing.
Detailed Electrical Specifications:
Specifications subject to change without notice.
Features:
• 2400 – 2500 MHz
• 0.65mm Height Profile
• 50 Ohm to 2 x 63.5+j17
Ohm
• Low Insertion Loss
• Surface Mountable
• Tape & Reel
• Non-conductive Surface
• RoHS Compliant
Zigbee
•
ROOM (25°C)
Parameter
Min.
Frequency
Unbalanced Port Impedance**
Balanced Port Impedance**
Return Loss**
2300
Typ.
Unit
2600
MHz
Ω
Ω
dB
0.4
0.6
dB
1
TBD
+85
Watts
ºC
50
127+j34
17
13
Insertion Loss* **
Power Handling
Operating Temperature
Max
-55
*Insertion Loss stated at room temperature (Insertion Loss is approximately 0.1 dB higher at +85 ºC)
*Stated performance assumes proper matching network found in application note: ANN-2003
Outline Drawing:
Side View
Top View (Near-side)
.041+.003
-.002
1.05+0.08
-0.06
[
]
.041+.003
-.002
1.05+0.08
-0.06
[
]
Bottom View (Far-side)
.012 [0.30]
.024±.0025
[0.62±0.064] 0.12 [0.30] 1
2
3x.010
[0.25]
4
4X .020 [0.50]
3
3x.010
[0.25]
Pin Designation
GND / DC Feed
1
+ RF GND
Dimensions are in Inches [Millimeters]
Mechanical Outline
2 Unbalanced Port
3 Balanced Port
4 Balanced Port
Tolerances are Non-Cumulative
1
BD2425N50ATI
Rev C
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 ceramic filled PTFE composites which possess excellent
electrical and mechanical stability.
An example of the PCB footprint used in the testing of these parts is shown below. An example of a DC-biased
footprint is also 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.
With DC Bias
Plated thru
hole to
ground
3X .011
[0.29]
.008 [0.21]
3X .011
[0.29]
.014 [0.36]
.008 [0.21]
.020
[0.50]
3X Transmission
Line
.020
[0.50]
Circuit Pattern
Footprint Pad (s)
Solder Resist
Dimensions are in Inches [Millimeters]
Mounting Footprint
2
BD2425N50ATI
Rev C
Packaging and Ordering Information:
Parts are available in reel and are packaged per EIA 481-2. Parts are oriented in tape and reel as shown
below. Minimum order quantities are 4000 per reel. See Model Numbers below for further ordering
information.
Contact us:
rf&s_support@ttm.com
3
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