PS25451

Data Sheet 291767 Issue 2

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

2

ELECTRICAL CHARACTERISTICS

test or by design and characterisation. They apply within the specified ambient temperature and supply voltage

unless otherwise stated.

Value

Characteristics

Min.

Typ.

Max.

Units

Conditions

Supply voltage

±2.4

±5.5

V

Bipolar supply, Gnd=0V

Supply current

0.6

2.0

3.5

mA

Effective input resistance

20

G

Effective input capacitance

15

pF

As measured at the sensor electrode

Primary Output Voltage Gain (Av)

47.5

50

52.5

When measured with 250pF coupling

capacitance.

Guard Output voltage gain

0.95

1.0

1.05

@1kHz

Lower -3dB point

0.20

Hz

Set by internal DC signal rejection

network – coupling capacitor 250pF

Upper -3dB point

4.0

kHz

0.2Hz

10kHz

-3dB

0.2Hz

10kHz

-3dB

Fig. 3 Typical Bode Plot for PS25451 Sensor with Coupling through 250pF Capacitor