Model BD0205F5050AHF Rev B Ultra Low Profile 1608 Balun 50 to 50 Balanced Description The BD0205F5050AHF is a low profile sub-miniature balanced to unbalanced transformer designed for differential input locations on data conversion devices such as A to D and D to A converters. In an easy to use surface mount package covering 75 MHz to 1000 MHz and with CMRR performances over 2x that of the incumbent wire wound products, this transformer is optimized to offer improved SFDR management during operation of the data converter device. The BD0205F5050AHF is ideal for high volume manufacturing and is higher performance and smaller form factor than traditional wire wound transformers. The BD0205F5050AHF has an unbalanced port impedance of 50 and a 50 balanced port impedance. This transformation enables single ended signals to be applied to differential ports on the data converter devices. The output ports have equal amplitude (-3dB) with 180 degree phase differential. The BD0205F5050AHF 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: * * * * * * * * * * * Parameter 70 - 1000 MHz (IL 3dB BW) 200-500 MHz ( IL 1dB BW) 0.83 mm Height Profile 50 Ohm to 2 x 25 Ohm Excellent CMRR (36dB typical) Input to Output DC Isolation Surface Mountable Tape & Reel Non-conductive Top Surface RoHS Compliant Halogen Free Min. Frequency Unbalanced Port Impedance Balanced Port Impedance Return Loss Insertion Loss* Amplitude Balance Phase Balance CMRR Power Handling Operating Temperature Typ. 70 4 Max Min. 1000 200 50 50 4.6 3.0 0.2 1 36 11 3.4 0.6 3 2 +85 -55 Typ. 50 50 13 0.9 0.2 1 36 Max Unit 500 MHz Ohm Ohm dB dB dB Degrees dB Watts C 1.1 0.6 3 2 +85 -55 * Insertion Loss stated at room temperature (Insertion Loss is approximately 0.1 dB higher at +85 C) Outline Drawing Top View (Near-side) Side View 4.10.10 .84.08 Bottom View (Far-side) 1 2 3 4x .96 10 9 2.10.10 4 2x .35 5 4x .35 4x .28 Orientation Marker Mechanical Outline Dimensions are in Millimeters Orientation Marker Pin 1 2 3 4 5 Designation Unbalanced OPEN GND GND GND Pin 6 7 8 9 10 8 7 6 10x .30 10x .22 Designation Balanced port 1 Open Balanced port 2 GND GND Visit us at www.anaren.com USA/Canada: Toll Free: Europe: Asia: (315) 432-8909 (800) 411-6596 +44 2392-232392 +86 512-62749282 Model BD0205F5050AHF Rev. B Typical Broadband Performance: 0 - 8.0 GHz. Insertion Loss -3 -0.3 -6 -0.6 -9 -0.9 -12 -1.2 -15 -1.5 Amplitude Balance 1.5 15 1 10 0.5 5 Frequency [MHz] CM RR 8000 7500 7000 6500 6000 5500 5000 4500 4000 3500 3000 2500 2000 1500 1000 0 -2 -5 -8 -11 -14 -17 -20 -23 -26 -29 -32 -35 -38 -41 -44 -47 -50 500 [dB] 8000 7500 7000 6500 6000 5500 5000 Frequency [MHz] Frequency [MHz] Visit us at www.anaren.com USA/Canada: Toll Free: Europe: Asia: (315) 432-8909 (800) 411-6596 +44 2392-232392 +86 512-62749282 8000 7500 7000 6500 6000 5500 5000 4500 4000 3500 3000 2500 2000 1500 8000 7500 7000 6500 6000 5500 5000 4500 4000 3500 -20 3000 -2 2500 -15 2000 -1.5 1500 -10 500 -1 1000 0 -5 0 0 -0.5 500 deg 20 1000 4500 Phase Balance 2 0 4000 Frequency [MHz] Frequency [MHz] [dB] 3500 0 8000 7500 7000 6500 6000 5500 5000 4500 4000 3500 3000 2500 2000 -3.6 1500 -36 1000 -3.3 0 -3 -33 3000 -2.7 -30 2500 -2.4 -27 2000 -2.1 -24 1500 -1.8 -21 500 -18 1000 [dB] 0 500 [dB] Return Loss - Input 0 Model BD0205F5050AHF Rev B Typical Performance: 0 MHz. to 1000 MHz. Insertion Loss -3 -0.3 -6 -0.6 -9 -0.9 -12 -1.2 -15 -1.5 800 850 900 950 1000 900 950 1000 600 550 650 650 600 550 500 450 400 350 300 250 200 150 100 1000 950 900 850 800 750 700 650 600 -20 550 -15 -2 500 -1.5 450 -10 400 -1 0 0 -5 50 0 -0.5 350 850 5 300 750 10 250 800 1 0.5 200 700 15 150 750 1.5 deg 20 100 500 Phase Balance 2 50 700 Amplitude Balance 0 450 Frequency [MHz] Frequency [MHz] [dB] 400 350 0 950 1000 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 -3.6 150 -36 100 -3.3 0 -3 -33 300 -2.7 -30 250 -2.4 -27 200 -2.1 -24 150 -1.8 -21 100 -18 50 [dB] 0 50 [dB] Return Loss - Input 0 Frequency [MHz] Frequency [MHz] CMRR 0 -6 -12 -18 -24 -36 -42 -48 -54 -60 -66 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 150 100 50 -72 0 [dB] -30 Frequency [MHz] Visit us at www.anaren.com USA/Canada: Toll Free: Europe: Asia: (315) 432-8909 (800) 411-6596 +44 2392-232392 +86 512-62749282 Model BD0205F5050AHF Rev. B Application in ADC Frontend: Modern Analog-to-Digital Converter (ADC) system often uses differential architecture to suppress the even-order harmonics. The performance of ADC system is heavily influenced by amplitude and phase imbalances arising from the ADC frontend, especially in high frequency applications. Anaren's multi-layer balun BD0205F5050AHF offers superb amplitude and phase balance performance over wide frequency range, translating to excellent SFDR performance of the ADC system. BD0205F5050AHF is a ferrite free design eliminating related inter-modulation and other non-linear effects. BD0205F5050AHF provides wideband impedance match, resulting in improvement of gain flatness at high frequencies, which in turn reduces input drive requirement. Anaren's highly repeatable manufacturing process results in little part to part variation, ensuring consistent performance in production. The schematic of a typical ADC front end application is shown below. In conjunction with many high speed ADC ICs, a bandwidth of 70MHz to 250MHz can be obtained for -1dB ripple of gain flatness. Differential load R1 and R2 are 33 ohm, slightly higher than the theoretical 25 ohm, to increase the voltage gain and reduce the required input drive, while keeping acceptable return loss. Optional series resistors, R5, R6, R7 and R8 are used to limit the amount of charge injection from the unbuffered ADC back into the analog input. Optional RC circuits, R3, R4, C4 and C5 further improve SDFR in many circumstances by supplying an additional current path to neutralize the charge injection. Anaren Balun BD0205F5050AHF Typical ADC frontend schematic using BD0205F5050AHF Visit us at www.anaren.com USA/Canada: Toll Free: Europe: Asia: (315) 432-8909 (800) 411-6596 +44 2392-232392 +86 512-62749282 Model BD0205F5050AHF Rev B 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 organic PTFE based composites which possess excellent electrical and mechanical stability. Xinger components are compliant to a variety of ROHS and Green standards and ready for Pb-free soldering processes. Pads are Gold plated with a Nickel barrier. An example of the PCB footprint used in the testing of these parts 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. 4.02 .89 4x PART ORIENTATION (TOP VIEW) .21 4x 1.01 2x .29 10x Plated thru hole(s) to Ground .29 6x .36 10x 1.66 2x Circuit Pattern Footprint Pad (s) 3x Transmission Line Solder Resist Dimensions are in Millimeters Mounting Footprint Visit us at www.anaren.com USA/Canada: Toll Free: Europe: Asia: (315) 432-8909 (800) 411-6596 +44 2392-232392 +86 512-62749282