data sheet 291501 issue 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 ps25012a1, PS25012B1 application boards for epic sensor ps25201a figure 1 description the ps25012a1 and PS25012B1 are single and dual channel application boards for the demonstration of the plessey ps25201a electric potential sensor. the ps25201a electric potential sensors on these boards allow the measurement of a wide range of electric potential sources from electrophysiologica l signals through to spatial electric field. the sen sors incorporate a dc block feature that allows the dc component of an applied signal to be rejected while maintaining good low frequency response. the electrode surface of the detector is passivated wit h a thin dielectric that allows the direct application to a test surface. in the case of contact with skin the re is no need for electrically conductive gel. the ps25201a sensor demonstrated on these boards is an integrated assembly designed for surface mount assembly on a motherboard. the application boards provide the regulated +2.5v and generated -2.5v supplies that are used to operate the sensor. this allows the boards to demonstrate the sensors from a wide, single sided, power supply voltage while the output of the sensor can cover the range 2.1v. the boards are connected by a high reliability five pin connector. two single channel ps25012a1 boards or a dual channel PS25012B1 board may be used to generate a differential signal. a typical example is shown in figure 3 below: figure 3: differential signal from two sensors in contact with the skin showing ecg type characteristics features ? ultra high input resistance, typically 5x10 10 . ? frequency response (3db) 200mhz to 4.0khz. ? wide operating voltage from 4.0 to 8.0v. ? operating temperature range 0 to 50oc. ? 200pf load drive capability. ? ground referenced output. ? dc signal rejection. ? dual sensor board allows differential operation. applications ? electrophysiological signal detection. ? ecg/eog/emg/eeg ? electric field and potential sensing. ? movement sensing figure 1: ps25012a1 single channel board carrying a single ps25201a sensor figure 2: PS25012B1 dual channel board carrying two ps25201a sensors
ps25012a1, PS25012B1 data sheet 291501 issue 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 these electrical characteristics apply to the ps250 12a1 and PS25012B1 application boards that carry th e ps25201a sensors. the electrical characteristics (@25oc) ar e guaranteed by either production test or by design and characterisation. they apply within the specified supply voltage unless otherwise stated. value characteristics min. typ. max. units conditions/notes supply voltage 4.0 8.0 v supply current; ps25012a1 2.7 10.0 ma supply current; PS25012B1 5.4 20.0 ma each ps25201a sensor consumes 2.0ma (typ). the additional current is consumed by the app?n board. input resistance (rin) 50 g input capacitance 10 pf voltage gain (av) 50 coupling capacitance 250 pf sensor to skin lower 3db point 0.200 hz upper 3db point 4.0 khz noise tbd electrical connector the ps25012a1 and PS25012B1 application boards are fitted with one or two five pin sockets. the conne ctivity of these sockets is shown below: pin 1 output pin 2 gnd pin 3 supply pin 4 gnd pin 5 not used the supply and ground connections of the two socket s on the dual channel ps25012b board are connected in parallel so that the board will be active with eith er one or both connectors in use. however, when bo th sockets are powered the supplied voltages must be identical. auxiliary components ps25000a control and interface box; 50hz. this box provides power for one or two sensors. i t incorporates switchable low pass and 50hz notch filters. the box contains an amplifier with switch able gain of either x1 or x10. the box also genera tes a differential signal from two sensors. the box in corporates a data acquisition card that provides th e data from the sensors via a usb cable to a computer . the box is powered by the usb connection. a soft scope is provided with this box for display of the signals on a computer. ps25001a control and interface box; 60hz. this box is identical to the ps25000a except that the switchable notch filter is preset to reject 60h z. ps25013 adapter cable. this 1.5m long cable connects the sockets of the p s25012a and ps25012b application boards to the ps25000a or ps25001a control and interface box. for further information about this and other produc ts, please visit: www.plesseysemiconductors.com
ps25012a1, PS25012B1 data sheet 291501 issue 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 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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