BD2425NCSR

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. 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 ROOM (25°C) Parameter Min. Frequency Unbalanced Port Impedance Balanced Port Impedance Return Loss Insertion Loss* Amplitude Balance Phase Balance CMRR Power Handling Operating Temperature 2400 Typ. Max Unit 2500 MHz Ω Ω dB dB 50 Matched 10 15 0.35 1.0 0.2 0.5 2 4 35 -55 * 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 1 +85 Watts ºC Outline Drawing 1 BD2425NCSR Rev E Schematic of the TTM 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 and mechanical stability. An example PCB footprint of TTM’s 0404 balun (BD2425NCSR) with MUR 0402 inductor (1.6nHLQG15HS1n6s02) 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. 2 BD2425NCSR Rev E 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