PS25012A3, PS25012B3
Application Boards for EPIC sensor PS25203
Features
•
•
•
•
•
•
•
•
Ultra high input resistance, typically 5x10
.
Frequency response (-3dB) 200mHz to 20kHz.
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.
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Description
The PS25012A3 and PS25012B3 are single and
dual
channel
application
boards
for
the
demonstration of the Plessey PS25203 electric
potential sensor.
The PS25203 electric potential sensors on these
boards allow the measurement of a wide range of
electric potential sources from electrophysiological
signals through to spatial electric field. The sensors
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 with a
thin dielectric that allows the direct application to a
test surface. In the case of contact with skin there is
no need for electrically conductive gel.
The PS25203 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 PS25012A3 boards or a dual
channel PS25012B3 board may be used to generate
a differential signal. A typical example is shown in
Figure 3 below:
Applications
•
•
Electrophysiological signal detection.
•
ECG/EOG/EMG/EEG
Electric field and potential sensing.
•
Movement sensing
Figure 1: PS25012A3 single channel board carrying a
single PS25203 sensor
Figure 1
Figure 2: PS25012B3 dual channel board carrying
two PS25203 sensors
Figure 3: Differential signal from two sensors in
contact with the skin showing ECG type
characteristics
Data Sheet 291503 issue 1
Plessey Semiconductors Ltd.
Design & Technology Centre, Delta 500, Delta Business Park, Great Western Way, Swindon, UK SN5 7XE
Tel: +44 1793 518000
Fax: +44 1793 518030
Web:
www.plesseysemi.com
1
PS25012A3, PS25012B3
Electrical Characteristics
These electrical characteristics apply to the PS25012A3 and PS25012B3 application boards that carry the PS25203
sensors. The electrical characteristics (@25ºC) are guaranteed by either production test or by design and
characterisation. They apply within the specified supply voltage unless otherwise stated.
Value
Min.
Supply voltage
Supply current; PS25012A3
Supply current; PS25012B3
Input resistance (Rin)
Input capacitance
Voltage Gain (Av)
Coupling capacitance
Lower -3dB point
Upper -3dB point
Noise
4.0
2.7
5.4
50
10
10
250
0.20
20.0
tbd
pF
Hz
kHz
Sensor to skin
Typ.
Max.
8.0
10.0
20.0
V
mA
mA
G
pF
Each PS25203 sensor consumes
2.0mA (typ). The additional current
is consumed by the app’n board.
Units
Characteristics
Conditions/Notes
Electrical Connector
The PS25012A3 and PS25012B3 application boards are fitted with one or two five pin sockets. The connectivity of
these sockets is shown below:
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Output
Gnd
Supply
Gnd
Not used
The supply and ground connections of the two sockets on the dual channel PS25012B3 board are connected in
parallel so that the board will be active with either one or both connectors in use. However, when both 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. It incorporates switchable low pass and 50Hz notch
filters. The box contains an amplifier with switchable gain of either x1 or x10. The box also generates
a differential signal from two sensors. The box incorporates a data acquisition card that provides the
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.
Control and Interface Box; 60Hz.
This box is identical to the PS25000A except that the switchable notch filter is preset to reject 60Hz.
Adapter cable.
This 1.5m long cable connects the sockets of the PS25012A3 and PS25012B3 application boards to
the PS25000A or PS25001A Control and Interface Box.
PS25001A
PS25013
For further information about this and other products, please visit:
www.plesseysemiconductors.com
Data Sheet 291503 Issue 1
Plessey Semiconductors Ltd.
Design & Technology Centre, Delta 500, Delta Business Park, Great Western Way, Swindon, UK SN5 7XE
Tel: +44 1793 518000
Fax: +44 1793 518030
Web:
www.plesseysemi.com
2
PS25012A3, PS25012B3
Legal Notice
Product information provided by Plessey Semiconductors Limited (“Plessey”) in this document is believed to be correct and accurate. Plessey
reserves the right to change/correct the specifications and other data or information relating to products without notice but Plessey accepts no
liability for errors that may appear in this document, howsoever occurring, or liability arising from the use or application of any information or
data provided herein. Neither the supply of such information, nor the purchase or use of products conveys 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 standard Terms and Conditions of Sale that are available on request. No warranty is given that
products do not infringe the intellectual property rights of third parties, and furthermore, the use of products in certain ways or in combination
with Plessey, or non-Plessey furnished equipments/components may infringe intellectual property rights of Plessey.
The purpose of this document is to provide information only and it may not be used, applied or reproduced (in whole or in part) for any purpose
nor be taken as a representation relating to the products in question. No warranty or guarantee express or implied is made concerning the
capability, performance or suitability of any product, and information concerning possible applications or methods of use is provided for
guidance only and not as a recommendation. The user is solely responsible for determining the performance 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 applications. For applications requiring unusual environmental requirements, extended
temperature range, or high reliability capability (e.g. military, or medical applications), special processing/testing/conditions of sale may be
available on application to Plessey.
Data Sheet 291503 Issue 1
Plessey Semiconductors Ltd.
Design & Technology Centre, Delta 500, Delta Business Park, Great Western Way, Swindon, UK SN5 7XE
Tel: +44 1793 518000
Fax: +44 1793 518030
Web:
www.plesseysemi.com
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