data sheet 291801issue 1 plessey semiconductors ltd. design & technology centre, delta 500, delta busine ss park, great western way, swindon, uk sn5 7xe tel: +44 1793 518000 fax: +44 1793 518030 web: www.plesseysemi.com 1 PS25102 epic ultra high impedance ecg sensor advance information data sheet 291801 issue 1 fig. 1 internal circuit and image of epic ecg senso r orderi ng information PS25102 custom package 0c to +50c plessey semiconductors electric potential integrated circuit (epic) product line targets a range of applications. the PS25102 is an ultra high impedance solid state ecg (electrocardiograph) sensor. it can be used as a dry contact ecg sensor without the need for potentially dangerous low impedance circuits across the heart. the resolution available is as good as or better than conventional wet electrodes. the device uses active feedback techniques to both lower the effective input capacitance of the sensing element (cin) and boost the input resistance (rin). these techniques are used to realise a sensor with a frequency response suitable for both diagnostic and monitoring ecg applications. the total voltage gain of the system is a function of both the input coupling capacitance (variable) and the internal sensor configuration. features ? ultra high input resistance, typically 2x10 10 ? dry-contact capacitive coupling ? input capacitance as low as 10pf ? upper -3db point typically 10khz ? lower -3db point typically 100mhz ? operates with single +4.75v to 8.0v supply ? sensors supplied as custom engineered probe assemb lies complete with connecting lead and din plug terminat ion applications ? non-critical patient monitoring equipment ? emergency response diagnostics ? lifestyle sports and health products ? suitable for long-term and remote monitoring
PS25102 data sheet 291801issue 1 plessey semiconductors ltd. design & technology centre, delta 500, delta busine ss park, great western way, swindon, uk sn5 7xe tel: +44 1793 518000 fax: +44 1793 518030 web: www.plesseysemi.com 2 electrical characteristics t amb = 0c to +50c, v dd = +5v. the electrical characteristics are guarante ed by either production test or by design and characterisation. they apply within the specifi ed ambient temperature and supply voltage unless ot herwise stated. value characteristics min. typ. max. units conditions supply (vdd) +4.75 5.00 8.0 unipolar (vss=0v) supply current 4.5 ma @vdd=5.0v voltage gain (av) 10 peak-to-peak effective input resistance (rine) 20 g effective input capacitance (cine) 15 pf coupling capacitance 1 nf sensor to skin lower -3db point 100 mhz set by internal dc signal rejection network ? coupling capacitor 1nf upper -3db point 10 khz noise tbd output voltage swing -2.4 2.4 v output signal can swing negative and positive and is centred on 0v 0.1hz 10khz -3db 0.1hz 10khz -3db fig. 2 typical bode plot for epic ecg sensor
PS25102 data sheet 291801issue 1 plessey semiconductors ltd. design & technology centre, delta 500, delta busine ss park, great western way, swindon, uk sn5 7xe tel: +44 1793 518000 fax: +44 1793 518030 web: www.plesseysemi.com 3 4 pin din plug termination application of the ecg sensor because of the large coupling capacitance to the bo dy (around 1nf) the epic sensor?s internal electrom eter can be used in differential mode to recover true surface p otential ecg signals from the surface of the skin. vdiff fig. 3 differential measurement of body (skin) surf ace potential to produce ecg trace pin1 signal out (yellow) pin2 earth (green) pin3 +6v (red) pin4 0v (blue)
PS25102 data sheet 291801issue 1 plessey semiconductors ltd. design & technology centre, delta 500, delta busine ss park, great western way, swindon, uk sn5 7xe tel: +44 1793 518000 fax: +44 1793 518030 web: www.plesseysemi.com 4 fig. 4 comparison of two ecg vectors from a pair of epic sensors (top) and two conventional ag/agcl electrodes (bottom) patents this component and many of the associated applicati ons are covered by the following international patents: 602 32 911.6-08 (de) au2007228660 ca2646411 cn200780026584.8 ep1451595 (ch) ep1451595 (es) ep1451595 (fr) ep1451595 (ie) ep1451595 (it) ep1451595 (nl) ep2002273 ep2047284 ep2174416 gb1118970.1 jp2009-500908 jp4391823 tw097126903 tw1308066 us12/293872 us12/374359 us12/669615 us13/020890 us13/163988 us788570
PS25102 data sheet 291801issue 1 plessey semiconductors ltd. design & technology centre, delta 500, delta busine ss park, great western way, swindon, uk sn5 7xe tel: +44 1793 518000 fax: +44 1793 518030 web: www.plesseysemi.com 5 for further information about this and other produc ts, please visit: www.plesseysemiconductors.com legal notice product information provided by plessey semiconduct ors limited (?plessey?) in this document is believe d to be correct and accurate. plessey reserves the right to change/correct the specificat ions and other data or information relating to prod ucts without notice but plessey accepts no liability for errors that may appear in this docume nt, howsoever occurring, or liability arising from the use or application of any information or data provided herein. neither the supply of such in formation, nor the purchase or use of products conv eys any licence or permission under patent, copyright, trademark or other intellectual property right of plessey or third parties. products sold by plessey are subject to its standar d terms and conditions of sale that are available o n request. no warranty is given that products do not infringe the intellectual property rights of third parties, and furthermore, the use o f products in certain ways or in combination with plessey, or non-plessey furnished equipments/c omponents may infringe intellectual property rights of plessey. the purpose of this document is to provide informat ion only and it may not be used, applied or reprodu ced (in whole or in part) for any purpose nor be taken as a representation relating to the pr oducts in question. no warranty or guarantee expres s or implied is made concerning the capability, performance or suitability of any produ ct, and information concerning possible application s or methods of use is provided for guidance only and not as a recommendation. the user is solely responsible for determining the performa nce and suitability of the product in any application and checking that any specification or data it seeks to rely on has not been superseded. products are intended for normal commercial applica tions. for applications requiring unusual environme ntal requirements, extended temperature range, or high reliability capability ( e.g. military, or medical applications), special pr ocessing/testing/conditions of sale may be available on application to plessey.
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