Model 2425B50-50C Rev. A Xinger Balun 50 to 100 Balanced rit Description The 2425B50-50C is a low profile sub-miniature balanced to unbalanced transformer designed for differential inputs and output locations on next generation wireless chipsets in an easy to use surface mount package covering 802.11b+g. The 2425B50-50C is ideal for high volume manufacturing and is higher performance than traditional ceramic baluns. The 2425B50-50C has an unbalanced port impedance of 50 and a 100 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 2425B50-50C is available on tape and reel for pick and place high volume manufacturing. ELECTRICAL SPECIFICATIONS** Features: * * * * * * * * * * * 2.4 - 2.5 GHz 180 Transformer 50 Ohm to 2 x 50 Ohm 802.11 b+g Compliant Low Insertion Loss Medium Power No DC Decoupling Capacitors Required Input to Output DC Isolation Surface Mountable Tape & Reel Convenient Package Frequency Unbalanced Port Impedance Balanced Port Impedance* Return Loss Insertion Loss GHz Ohms Ohms dB min dB max 2.4 - 2.5 50 100 17 0.55*** Amplitude Balance Phase Balance Power Handling JC dB Degrees max Watts C / Watt C 0 0.5 180 5.0 4 28 -55 to +85 Operating Temp. **Specification based on performance of unit properly installed on microstrip printed circuit boards with 50 nominal impedance. Specifications subject to change without notice. * 50 reference to ground *** Insertion Loss stated at room temperature (0.6 dB Max at +85 C) Outline Drawing Top View (Near-side) Side View Bottom View (Far-side) .120.005 [3.050.13] 3 2 .024.002 [0.610.05] 1 .120.005 [3.050.13] 4 5 6 Dimensions are in Inches [Millimeters] Mechanical Outline 4X .010.004 [0.250.10] .095.004 [2.410.10] Pin 1 2 3 4 5 6 Designation Out 1 GND Out 2 GND In GND 6X .010.004 [0.230.10] 6X .030.004 [0.760.10] Tolerances are Non-Cumulative Available on Tape and Reel For Pick and Place Manufacturing. USA/Canada: Toll Free: Europe: (315) 432-8909 (800) 544-2414 +44 2392-232392 Model 2425B50-50C Rev. A Typical Broadband Performance: 2.3 GHz. to 2.7 GHz. Pin Configuration: Balun Pin Configruation Pin 1 4 Pin 5 50 Balanced Port Terminals Unbalanced Port 4 Pin 3 USA/Canada: Toll Free: Europe: (315) 432-8909 (800) 544-2414 +44 2392-232392 Available on Tape and Reel For Pick and Place Manufacturing. The internal configuration of the Xinger balun is diagramed to the left; the unbalanced port is DC connected to ground and the two balanced ports are DC connected and floating. For many chipset applications there is an opportunity to eliminate two decoupling capacitors and/or use a single bias point if applicable. Differential drive is popular in integrated circuit since it aids stability in the presence of bond wire and pin inductance, provides some degree of immunity to power supply and ground noise, and can provide higher output power in the case of some device limits. The construction of the Xinger balun is bonded multi-layered stripline made of low loss dielectric material with plated through vias connecting the internal circuitry to the external printed circuit board, similar to that of the Xinger hybrids and directional couplers. Model 2425B50-50C Rev. A Typical Performance: 2.35 GHz. to 2.55 GHz. Mounting Configuration: 6X .030 [0.76] 4X .012 [0.30] 6X .022 [0.57] .095 [2.41] 2X .009 [0.22] Circuit Pattern Footprint Pad (s) Solder Resist Dimensions are in Inches [Millimeters] Mounting Footprint Multiple plated thru holes to ground 3X 50 Transmission Line In order for Xinger surface mount components to work optimally, there must be a 50 transmission line to the balanced port and 50 transmission lines from the unbalanced ports. If this condition is not satisfied, amplitude balance, insertion loss 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 having X and Y thermal coefficient of expansion (CTE) of 17 ppm/oC An example of the PCB footprint used in the testing of these parts is shown to the left. 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. Available on Tape and Reel For Pick and Place Manufacturing. USA/Canada: Toll Free: Europe: (315) 432-8909 (800) 544-2414 +44 2392-232392 Model 2425B50-50C Rev. A 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. .157 [4.00] .079 [2.01] .157 [4.00] .010 [0.25] O.059 [O1.50] .069 [1.75] .138 [3.50] .130 [3.30] .063 [1.61] .030 [0.80] O.039 [O0.99] Direction of Part Feed (Unloading) Dimensions are in inches [mm] OA OC OD QUANTITY/REEL 4000 TABLE 1 REEL DIMENSIONS (inches [mm]) OA 7.00 [177.8] B 0.32 [8.0] OC 2.0 [50.8] OD 0.512 [13.0] USA/Canada: Toll Free: Europe: (315) 432-8909 (800) 544-2414 +44 2392-232392 B Available on Tape and Reel For Pick and Place Manufacturing. .315 [8.00] Model 2425B50-50C Rev. A Available on Tape and Reel For Pick and Place Manufacturing. USA/Canada: Toll Free: Europe: (315) 432-8909 (800) 544-2414 +44 2392-232392