56kbit modem transformers oxford electrical products 15-17 industrial estate, wroslyn road, freeland, witney, oxfordshire, ox8 8hz england tel: +44 (0) 1993 883214 fax: +44 (0) 1 993 882500 2/96 type no. size (mm) return loss (db) 200-4khz insertion loss (db) @1khz frequency response (db) harmonic distortion 400hz (db) typical 600hz (db) typical isolation volts rms leakage induct. (mh) babt approved number z1656 z1656/4 z1612e z1256 >20 >20 >20 >26 0.80 0.80 1.50 1.25 100-4khz +/- 0.1db 100-4khz +/- 0.1db 200-4khz +/- 0.1db 50-5khz +/- 0.07db -100 -88 -83 -84 -93 -91 -93 -93 3750 3750 3750 3750 19 2.8 19.4 14.4 cr/0125 cr/0126 cr/0128 cr/0127 18x18x13 encapsulated 18x18x13 encapsulated 18x18x13 encapsulated 19x15x11.2 encapsulated PC3456 23x16x4.5 including pins >31 4.00 100-5khz +/- 0.05db -97 -104 1500 1.3 pending pc card (smd) version through hole versions characteristics general the advent of high-speed 56kbit modems has necessitated the design of line isolation transformers that are capable of providing extremely low distortion across a wide frequency range. oep offers the user a number of different variants, with industry standard pin outs, from which to select a device to satisfy particular technical and commercial considerations. construction with the exception of the smd pc card device, p/n PC3456 these transformers are designed for conventional pcb mounting. the epoxy resin encapsulation provides reinforced insulation to meet the requirements of en60950 / en41003 and babt approvals. double section bobbins are used except for the z1656/4 and PC3456 versions which are concentrically wound on single section bobbins for closer coupling of the windings thus providing extremely low leakage inductance figures.
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