PS25012A4 Datasheet, PDF (1/3 Pages) List of Unclassifed Manufacturers – APPLICATION BOARDS FOR EPIC SENSOR PS25204

PS25012A4, PS25012B4
Application Boards for EPIC sensor PS25204
Features
• Ultra high input resistance, typically 5x10¹⁰ Ω.
• Frequency response (-3dB) 50mHz 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.
Applications
• Electrophysiological signal detection.
• ECG/EOG/EMG/EEG
• Electric field and potential sensing.
• Movement sensing
Figure 1: PS25012A4 single channel board carrying a
single PS25204 sensor
Figure 1
Description
The PS25012A4 and PS25012B4 are single and
dual channel application boards for the
demonstration of the Plessey PS25204 electric
potential sensor.
The PS25204 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 PS25204 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 PS25012A4 boards or a dual
channel PS25012B4 board may be used to generate
a differential signal. A typical example is shown in
Figure 3 below:
Figure 2: PS25012B4 dual channel board carrying
two PS25204 sensors
Figure 3: Differential signal from two sensors in
contact with the skin showing ECG type
characteristics
Data Sheet 291504 issue 1
Plessey Semiconductors Ltd.
Design & Technology Centre, Delta 500, Delta Business Park, Great Western Way, Swindon, UK SN5 7XE
Tel: [phone]
Fax: [phone]
Web: www.plesseysemi.com
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