HIGH FREQUENCY MAGNETICS Wideband Hybrid Signal Combiner & Splitter • A wideband, equal-ratio hybrid transformer suitable for both analog and digital applications requiring signal splitting or combining • Qualified per Bellcore TR-TSY-00357-1 • Meets IEC-695, 2-2 flammability requirements TM9923 • Compatible with standard printed-wiring board assembly and cleaning processes and machine placement • Compatible with infrared (IR) reflow soldering processes so it can be used in mixed-assembly (wave and reflow) solder application ELECTRICAL SPECIFICATIONS at 25° C Impedance Ratio Nominal Signal Split dB 3dB Bandwidth typ (1 - 6) : (3 - 6) + (4 - 6) ASIG to BSIG ASIG to CSIG ASIG to BSIG ASIG to CSIG 75Ω : 75Ω + 75Ω 3.0 20 kHz - 800 MHz Part Number 2689J2 Pulse Rise Time ns typ 0.5 MECHANICAL 0.70 [17.78] max SCHEMATIC 0.45 [11.43] max ASIG 1 0.120 ±0.006 [3.05 ±0.15] 0.023 [0.58] Sq typ (Phosphor bronze, solder-coated) 5 2 Terminal 1 ID 1 0.40 [10.16] max 2 GND 6 3 3 BSIG 4 CSIG 0.250 [6.35] 6 Bottom View 5 4 0.200 [5.08] 0.400 [10.16] 0.120 [3.05] ©1999 Bel Fuse Inc. Specifications subject to change without notice. 06.99 Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com T148 HIGH FREQUENCY MAGNETICS Wideband Hybrid Signal Combiner & Splitter TM9923 PIN DIAGRAM APPLICATIONS NOTES The 2689J2 hybrid transformer operates with 75Ω terminations over an extremely wide frequency spectrum (3 dB response: 20 kHz to 800 MHz). It can also be used as a pulse transformer with very fast pulses (typical rise time: 0.5 ns). The 2689J2 operates as either a signal splitter or a signal combiner. As a signal splitter, the transformer provides two identical output signals (which are in phase with each other) from a single input. Each of the two output signals is 3 dB down from the input signal (half the power of the input signal). There is a high degree of separation or transhybrid loss between the two output signals. As a signal combiner, the transformer provides a single output signal from two identical input signals (which are in phase with each other). The output signal has twice the power of either input signal. 2689J2 ASIG 1 6 GND COM1 2 5 COM2 BSIG 3 4 CSIG SIGNAL SPLITTER INPUT 2689J2 75 LINE ASIG OUTPUT 75 LINE BSIG COM1 R1 OUTPUT COM2 PIN DESCRIPTIONS AND TERMINATIONS 75 LINE CSIG C1 GND Pin 1 Symbol Name and Function ASIG A signal. Input for splitter configuration. Output for combiner application. 2 COM1 Common point of transformer 1. SIGNAL COMBINER Must be connected externally to COM2. 3 BSIG B signal. Output for splitter configuration. 4 CSIG COM2 C signal. Output for splitter configuration. INPUT 75 LINE GND Ground. Connect to circuit ground. R1 162Ω external resistor. C1 BSIG Common point of transformer 2. COM1 R1 Must be connected externally to COM1. 6 75 LINE ASIG Input for combiner application. 5 OUTPUT 2689J2 Input for combiner application. 75 LINE INPUT CSIG COM2 C1 GND 7 pF external capacitor. ©1999 Bel Fuse Inc. Specifications subject to change without notice. 06.99 CORPORATE FAR EAST EUROPE Bel Fuse Inc. 198 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com Bel Fuse Ltd. 8F / 8 Luk Hop Street San Po Kong Kowloon, Hong Kong Tel 852-2328-5515 Fax 852-2352-3706 www.belfuse.com Bel Fuse Europe Ltd. Preston Technology Management Centre Marsh Lane, Suite F23, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com T149