BD2425NCSR
Rev E
Ultra Low Profile 0404 Balun for the
Cambridge Silicon Radio M1824 UNIFI-1 Chipset
Description:
The BD2425NCSR is a low cost, low profile sub-miniature
unbalanced to balanced transformer designed specifically for
Cambridge Silicon Radio’s UNITI-1 WiFi chipset. The BD2425NCSR
is ideal for high volume manufacturing and delivers higher
performance than traditional ceramic baluns. The BD2425NCSR
matched exactly to the differential port impedances of the UNIFI-1
device. The BD2425NCSR enables single ended signals to be
applied to differential ports of this Cambridge Silicon Radio chipsets.
The output ports have equal amplitude (-3dB) with 180 degree phase
differential. The BD2425NCSR 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:
• 2400 – 2500 MHz
• 0.56 mm Height Profile
• Matched for CSR’s UNIFI-1
• Low Insertion Loss
• Surface Mountable
• Tape & Reel
• Non-conductive
• RoHS Compliant
• Halogen free
Parameter
Min.
Typ.
Max
Unit
MHz
Ω
Frequency
2400
2500
Unbalanced Port Impedance
Balanced Port Impedance
Return Loss
50
Matched
15
Ω
10
dB
dB
Insertion Loss*
0.35
0.2
1.0
0.5
4
Amplitude Balance
Phase Balance
CMRR
2
35
Power Handling
Operating Temperature
1
Watts
-55
+85
ºC
* Insertion Loss stated at room temperature (Insertion Loss is approximately 0.1 dB higher at +85 ºC)
** Stated performance is based on the proper matching network described in the data sheet
Outline Drawing
1