etaldoc 724/7 page 1 of 5 april 2005 product data sheet low distortion P3357 line matching transformer features applications ? low distortion ? v.90 and v.92 modems ? lead-free (pb-free) ? v.34 modems ? rohs compliant ? fax machines ? 12.6mm (0.5?) seated height ? instrumentation ? industry standard pinout ? iec 60950 and ul 60950 certified ? ul recognized component ? extended frequency response ? flat tx and rx responses ? simple matching ? low insertion loss ? vacuum encapsulated description P3357 is intended for v.90 and v.92 (56kbps) modems and other high-speed applications where ultra-low distortion at moderate power levels and very low voiceband frequencies is required at a competitive price. P3357 is a vacuum encapsulated version of p3356 with the benefits of greater mechanical robustness and breakdown strength. the part is completely lead-free, compliant with rohs directive 2002/95/ec, and suitable for lead-free and conventional processing. P3357 uses patented design and construction methods to achieve excellent signal performance and safety isolation to international standards. P3357 is certified to iec 60950 and ul 60950. P3357 is a ul recognized component and is supported by an iec cb test certificate. P3357 has exceptionally flat frequency response from 30hz to 10khz, a 3db bandwidth of over 50khz and requires only the very simplest of matching to achieve good return loss and transhybrid loss across the voiceband, with very low levels of signal distortion at signal frequencies as low as 150hz. patented
P3357 etaldoc 724/7 page 2 of 5 april 2005 specifications electrical at t = 25oc and as circuit fig. 2 unless otherwise stated. parameter conditions min typ max units insertion loss f = 2khz, r l = 600 - 1.5 - db frequency response lf -3db cutoff hf -3db cutoff 100hz ? 4khz - - - 10 55 - - - 0.1 hz khz db return loss (5) 200hz ? 4khz 16 - - db transhybrid loss (5) 200hz ? 4khz 20 - - db third harmonic distortion (1) 150hz -3dbm in line 200hz -10dbm in line - - -70 -89 - - dbm dbm voltage isolation (2) 50hz dc 2.12 3.0 - - - - kvrms kv operating range: functional storage 0 -40 - - +70 +85 oc oc lumped equivalent circuit parameters as fig. 1 dc resistance (3) sum of winding resistances r dcp + r dcs 165 - 207 leakage inductance, l 3 3.9 5 mh shunt inductance, lp (4) 200hz 10mv 6 9 - h shunt loss, rp 200hz 10mv 12 15 - k notes: 1. third harmonic typically exceeds other harmonics by 10db. 2. components are 100% tested at 6.5kvdc. 3. caution: do not pass dc through windings. telephone line current must be diverted using semiconductor line hold circuit or choke. 4. at signal levels greater than 100mv, lp will increase and rp will decrease slightly but the effect is usually favourable to the return loss characteristic. 5. return loss and transhybrid loss can be improved to 30db in improved matching circuit. the values shown relate to the simplest configuration, fig. 2. equivalent circuit fi g . 1 ideal 1:1 ? l ? l
P3357 etaldoc 724/7 page 3 of 5 april 2005 matching recommendations the following recommendations start with the simplest implementations and progress to enhanced performance utilizing additional components. good performance is achieved even with the simplest configurations. the implementations assume a low impedance balanced tx drive and a relatively high impedance rx input, as is commonly available, though use with other tx/rx arrangements is straightforward. note that there are no changes to components on the line side, or in the hybrid, whether 600 or complex reference impedance selected, thus assisting country configuration. for complex impedance, the matching circuits derived are suitable for reference impedances of the type 270 + 750//150nf e.g. european ctr21 and 220 + 820//120nf (or 115nf) e.g. australia, south afri ca, etc., and yield similar performance characteristics. for other impedances, please contact profec technologies. minimum cost implementations insertion loss: 1.8db @ 2khz frequency response : 0.2db 30hz ? 10khz return loss: 16db 200hz ? 4khz transhybrid loss: 22db 200hz ? 4khz improved matching insertion loss: 1.8db @ 2khz frequency response : 0.2db 30hz ? 10khz return loss: 18db 200hz ? 4khz transhybrid loss: 22db 50hz ? 10khz insertion loss: 1.0db @ 2khz frequency response : 0.5db 50hz ? 4khz return loss: 18db 200hz ? 4khz transhybrid loss: 14db 200hz ? 4khz insertion loss: 1.0db @ 2khz frequency response : 0.5db 50hz ? 4khz return loss: 20db 200hz ? 4khz transhybrid loss: 16db 50hz ? 4khz 600 fi g . 4 li ne 600 10nf 560 rxa t xa2 t xa1 22 f 600 fi g . 2 li ne 600 560 rxa t xa2 t xa1 22 f 10nf li ne 270 (220) 750 (820) 22 f 150nf (120nf) 750 100nf* *note: 100nf capacitor should have a temperature stable dielectric 120 europ e a n ctr21/(austra lia, etc .) fi g . 5 rxa t xa2 t xa1 li ne 270 (220) 750 (820) 150nf (120nf) 820 100nf* *note: 100nf capacitor should have a temperature stable dielectric 100 europ e a n ctr21/(austra lia , etc .) fi g . 3 rxa t xa2 t xa1 patented
P3357 etaldoc 724/7 page 4 of 5 april 2005 improved matching and hybrid insertion loss (line to rxa): 2.8db @ 2khz frequency response : 0.2db 30hz ? 10khz return loss: 20db 200hz ? 4khz transhybrid loss: 30db 50hz ? 10khz insertion loss (line to rxa): 2.2db @ 2khz frequency response : 0.5db 50hz ? 4khz return loss: 20db 200hz ? 4khz transhybrid loss: 18db 200hz ? 4khz 600 instrumentation certification insertion loss: 1.5db @ 2khz frequency response : 0.2db 20hz ? 20khz return loss: 16db 20hz ? 20khz safety constructed in accordance with iec 60950-1, en 60950-1 and ul 60950-1, supplementary insulation, 250vrms maximum working voltage, flammability class v-0. certified under the iec cb scheme (certificate dk-8570) to iec 60950-1-2001, sub-clauses 1.5, 1.5.1, 1.5.2, 1.7.1, 2.9, 2.9.1, 2.9.2, 2.9.3, 2.10, 2.10.1, 2.10.2, 2.10.3, 2.10.3.1, 2.10.3.3, 2.10.4, 2.10.5, 2.10.5.1, 2.10.5.2, 2.10.5.4, 4.7, 4.7.1 (classv-1), 4.7.3, 4.7.3.1, 4. 7.3.4, 5.2, 5.2.1, 5.2.2, 6.1.2.1 (finland, norway, sweden national deviations) for a maximum working voltage of 250vrms, nominal mains supply voltage not exceeding 300vrms and a maximum operating temperature of 70oc in pollution degree 2 environments. recognized under the component recognition program of underwriters laboratories inc. to us and canadian requirements can/csa c22.2 no. 60950-1-03/ul60950-1, first edition, based on iec 60950-1, first edition, maximum working voltage 180vrms (creepage), 420v peak (clearance), pollution degree 2, supplementary insulation. ul file number e203175. additionally, profec technologies certifies all transformers as providing voltage isolation of 2.12kvrms, 3kv dc minimum. all shipments are supported by a certificate of conformity to current applicable safety standards. 600 fi g . 6 li ne 600 10nf 560 1k 1nf 10k rxa t xa2 t xa1 22 f 10nf 1nf li ne 270 (220) 750 (820) 22 f 150nf (120nf) 750 100nf* *note: 100nf capacitor should have a temperature stable dielectric 120 europ e an ctr21/(austra lia, etc .) fi g . 7 rxa t xa2 t xa1 1k 10k 47 f* 47 f* 600 fi g . 8 600 600 6.8nf 6.8nf * if no dc block required, one of these capacitors can be removed and the other set to 22 f , or, if preferred, both capacitors can be eliminated. patented
P3357 etaldoc 724/7 page 5 of 5 april 2005 construction dimensions shown are in millimetres (inches). geometric centres of outline and pin grid coincide within a tolerance circle of 0.6mm?. windings may be used interchangeably as primary or secondary and are not oriented in potting box. absolute maximum ratings intellectual property rights (ratings of components independent of circuit). short term isolation voltage (1s) dc current storage temperature lead temperature, 10s 4.6kvrms, 6.5kvdc 100 a -40oc to +85oc 260oc etal, p3356 and P3357 are trade marks of profec technologies ltd. the trade mark etal is registered at the uk trade marks registry. profec technologies ltd. is the owner of the design right under the copyright designs and patents act 1988 and no rights or licences are hereby granted or implied to any third party. P3357 design and construction are protected by patents. british patent no. 2333646. usa patent no. 6, 344, 787 european patent no. 1082734 china patent no. zl 99806739.3 ? 1998 - 2005 profec technologies ltd. reproduction prohibited. etal group oy, kuormatie 14, fin-03101, nummela telephone: +358 (0)20 7500 330 fax: +358 (0)20 7500 333 website: www.etalgroup.com email: etalgroup@egruppen.com connections fm 25326 iso 9001 e203175 e 2
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