US5781 View Datasheet(PDF) - Unspecified
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Description
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US5781 Datasheet PDF : 6 Pages
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US5781
CMOS High Sensitivity Switch
Preliminary Datasheet
Unique Features
CMOS Hall IC Technology
The chopper stabilized amplifier uses switched
capacitor techniques to eliminate the amplifier off-
set voltage, which, in bipolar devices, is a major
source of temperature sensitive drift. CMOS
makes this advanced technique possible. The
CMOS chip is also much smaller than a bipolar
chip, allowing very sophisticated circuitry to be
placed in less space. The small chip size also
contributes to lower physical stress and less
power consumption.
Installation Comments
Consider temperature coefficients of Hall IC and
magnetics, as well as air gap life time variations.
Observe temperature limits during wave solder-
ing.
Applications
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 50 mA. For
severe EMC conditions, use the application circuit
on this page.
Automotive and Severe
Environment Protection
Circuit
R1 100Ω
D1
Supply
Voltage
Z1
C1
4.7nF
VDD
RL
1.2K
Hall IC
OUT
C2
4.7nF
VSS
Two Wire Current Biasing Circuit
V DD IIN
RL Iout
Absolute Maximum Ratings
Supply Voltage (Operating), VDD
Supply Current (Fault), IDD
Output Voltage, VOUT
Output Current (Fault), IOUT
Power Dissipation, PD
Operating Temperature Range, TA
Storage Temperature Range, TS
Maximum Junction Temp, TJ
ESD Sensitivity (All Pins)
3.5V to 24V
50mA
3.5V to 24V
50mA
100mW
-40 to 150°C
-65 to 150°C
175°C
+/- 2KV
Hall
Rb
IC
The resistors Rb and R L 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 + IDD )
B OP = Ion = (Ioff + VDD / RL )
US5781 CMOS High Sensitivity Switch
3901005781 Rev 1.7
7/23/01
Page 5
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