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US2881

CMOS High Sensitivity Latch

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US2881/2882

CMOS High Sensitivity Latch

Unique Features

CMOS Hall IC Technology

The Chopper Stabilized Amplifier, using

switched capacitor techniques, eliminates the

amplifier offset voltage, which in bipolar devices

is a major source of temperature sensitive drift.

CMOS makes this advanced technique possi-

ble.

The CMOS chip is also much smaller than the

Bipolar chip, allowing very sophisticated cir-

cuitry to be placed in less space. The small chip

size also contributes to lower physical stress

and less power consumption.

Installation

Consider temperature coefficients of Hall IC and

magnetics, as well as air gap and life time varia-

tions. Observe temperature limits during wave

soldering.

Application Comments

If reverse supply protection is desired, use a re-

sistor in series with the VDD pin. The resistor will

limit the Supply Current (Fault), IDD, to 50mA.

For severe EMC conditions, use the application

circuit below.

Applications Examples

Automotive and Severe

Environment Protection Circuit

R1 100Ω

D1

Supply

Voltage

Z1

C1

4.7n

F

VDD

1R.2L

K

Hall IC

OUT

4C.72n

F

VSS

Two Wire Optional Current

Biasing Circuit

V

DD

IIN

RL Iout

Hall

Rb

IC

US2881 CMOS High Sensitivity Latch

The resistors Rb and RL can be used to bias the input current, Iin. Refer

to the part specification for limiting values. This circuit will help in getting

the precise ON and OFF currents desired.

BRP = Ioff = (VDD / Rb + DI D )

BOP = Ion = (Ioff + VDD / RL )

3901002881 Rev 5.6

23/July/00

Page 5

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