PS25014A1, PS25014B1
Application Boards for EPIC sensor PS25401A
Features Description
The PS25014A1 and PS25014B1 are single and
Ultra high effective input impedance, typically 20G.
dual channel application boards for the
Wide operating voltage from 4.0 to 8.0V.
demonstration of the Plessey PS25401A electric
o
Operating temperature range 0 to 50 C.
potential sensor.
200pF load drive capability.
Ground referenced output.
The PS25401A electric potential sensors on these
boards allow the measurement of a wide range of
DC signal rejection.
electric potential sources. Two sensors may be used
Dual sensor board allows differential operation.
differentially to determine electric field. The sensors
incorporate a DC block feature that allows the DC
Applications
component of an applied signal to be rejected while
maintaining good low frequency response. The
Movement sensing due to electric field
electrode surface of the detector is passivated with
disturbance
an inert dielectric that provides environmental
Electric field and potential sensing.
protection. These sensors are not intended for direct
coupling to the surface of the skin. In the case of
electrophysiological sensing the following sensors
should be used:
ECG -3dB Voltage Application
Sensor bandwidth gain Boards
mHz Single/Dual
PS25201 200 50 PS25012A
Figure 1: PS25014A1 single channel board carrying a
PS25012B
single PS25401A sensor
PS25201A 200 50 PS25012A1
PS25012B1
PS25202 50 50 PS25012A2
PS25012B2
PS25203 200 10 PS25012A3
PS25012B3
PS25204 50 10 PS25012A4
PS25012B4
Figure 1
The PS25401A sensor demonstrated on these
boards is an integrated assembly designed for
surface mount assembly on a motherboard.
Figure 2: PS25014B1 dual channel board carrying
The application boards provide a regulated +2.5V
two PS25401A sensors
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.
Data Sheet 291514 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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Electrical Characteristics
These electrical characteristics apply to the PS25014A1 and PS25014B1 application boards that carry the PS25401A
o
sensors. The electrical characteristics (@25 C) 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 PS25401A sensor consumes
Supply current; PS25014A1 2.7 10.0 mA
2.0mA (typ). The additional current
Supply current; PS25014B1 5.4 20.0 mA
is consumed by the appn board.
Effective input impedance 20 tbd G
Effective input capacitance 15 pF
Voltage Gain (Av) 50
Noise tbd
Electrical Connector
The PS25014A1 and PS25014B1 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 PS25014B1 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 EPIC application boards to the PS25000A or
PS25001A Control and Interface Box.
Data Sheet 291514 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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