PS25012A1, PS25012B1
Application Boards for EPIC sensor PS25201A
Features Description
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The PS25012A1 and PS25012B1 are single and
Ultra high input resistance, typically 5x10 .
dual channel application boards for the
Frequency response (3dB) 200mHz to 4.0kHz.
demonstration of the Plessey PS25201A electric
Wide operating voltage from 4.0 to 8.0V.
potential sensor.
Operating temperature range 0 to 50C.
200pF load drive capability.
The PS25201A electric potential sensors on these
boards allow the measurement of a wide range of
Ground referenced output.
electric potential sources from electrophysiological
DC signal rejection.
signals through to spatial electric field. The sensors
Dual sensor board allows differential operation.
incorporate a DC block feature that allows the DC
component of an applied signal to be rejected while
Applications
maintaining good low frequency response. The
electrode surface of the detector is passivated with a
Electrophysiological signal detection.
thin dielectric that allows the direct application to a
test surface. In the case of contact with skin there is
ECG/EOG/EMG/EEG
no need for electrically conductive gel.
Electric field and potential sensing.
Movement sensing
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 1: PS25012A1 single channel board carrying a
Figure 3 below:
single PS25201A sensor
Figure 1
Figure 3: Differential signal from two sensors in
contact with the skin showing ECG type
Figure 2: PS25012B1 dual channel board carrying
characteristics
two PS25201A sensors
Data Sheet 291501 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 PS25012A1, PS25012B1
Electrical Characteristics
These electrical characteristics apply to the PS25012A1 and PS25012B1 application boards that carry the PS25201A
sensors. The electrical characteristics (@25C) are guaranteed by either production test or by design and
characterisation. They apply within the specified supply voltage unless otherwise stated.
Value
Units
Characteristics Conditions/Notes
Min. Typ. Max.
Supply voltage 4.0 8.0 V
Each PS25201A sensor consumes
Supply current; PS25012A1 2.7 10.0 mA
2.0mA (typ). The additional current
Supply current; PS25012B1 5.4 20.0 mA
is consumed by the appn 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 connectivity 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 sockets on the dual channel PS25012B 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.
PS25001A Control and Interface Box; 60Hz.
This box is identical to the PS25000A except that the switchable notch filter is preset to reject 60Hz.
PS25013 Adapter cable.
This 1.5m long cable connects the sockets of the PS25012A and PS25012B application boards to the
PS25000A or PS25001A Control and Interface Box.
For further information about this and other products, please visit:
www.plesseysemiconductors.com
Data Sheet 291501 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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