BD2425NCSR Anaren

Model BD2425NCSR Rev C 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 Radios 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 (25C) Features: 2400 2500 MHz Parameter Min. Typ. Max Unit 0.56 mm Height Profile Frequency 2400 2500 MHz Matched for CSRs UNIFI-1 Unbalanced Port Impedance 50 Low Insertion Loss Balanced Port Impedance Matched Surface Mountable Tape & Reel Return Loss dB 10 15 Non-conductive Insertion Loss* 0.35 1.0 dB RoHS Compliant Amplitude Balance 0.2 0.5 Halogen free Phase Balance 2 4 CMRR 35 Power Handling 1 Watts Operating Temperature -55 +85 C * Insertion Loss stated at room temperature (Insertion Loss is approximately 0.1 dB higher at +85 C) ** Stated performance is based on the proper matching network described in the data sheet Outline Drawing Top View (Near-side) Side View Bottom View (Far-side) .012 0.30 .022.002 .041.004 1 0.05 0.56 .012 0.30 2 0.10 1.04 3x.010 .004 .041 0.25 1.040.10 4 3 .020 0.51 3x.010 0.25 .020 0.51 Pin Designation GND / DC Feed 1 + RF GND 2 Unbalanced Port 3 Balanced Port Dimensions are in Inches Millimeters 4 Balanced Port Mechanical Outline Tolerances are Non-Cumulative USA/Canada: (315) 432-8909 Available on Tape Toll Free: and Reel for Pick and (800) 411-6596 Place Manufacturing. +44 2392-232392 Europe: Model BD2425NCSR Rev C Schematic of the Anaren balun with matching components 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 o and mechanical stability having X and Y thermal coefficient of expansion (CTE) of 17 ppm/ C. An example PCB footprint of Anarens 0404 balun (BD2425NCSR) with MUR 0402 inductor (1.6nH- LQG15HS1n6s02) and ATC 0402 capacitor (6.8pF 600L6R8) used in the testing 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. DC Bias cap (0402 ATC 6.8pF) Anaren balun (BD2425NCSR) Matching inductor (0402 MUR 1.6nH) USA/Canada: (315) 432-8909 Available on Tape and Reel for Pick and Place Toll Free: (800) 411-6596 Manufacturing. Europe: +44 2392-232392