User manual Allegro Multimedia A1301

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A1301 and A1302  
Continuous-Time Ratiometric Linear Hall Effect Sensors  
Features and Benefits  
Description  
Low-noise output  
TheA1301 andA1302 are continuous-time, ratiometric, linear  
Hall-effect sensors. They are optimized to accurately provide  
a voltage output that is proportional to an applied magnetic  
field. These devices have a quiescent output voltage that is  
50% of the supply voltage. Two output sensitivity options are  
provided: 2.5 mV/G typical for the A1301, and 1.3 mV/G  
typical for the A1302.  
Fast power-on time  
Ratiometric rail-to-rail output  
4.5 to 6.0 V operation  
Solid-state reliability  
Factory-programmed at end-of-line for optimum  
performance  
Robust ESD performance  
The Hall-effect integrated circuit included in each device  
includes a Hall sensing element, a linear amplifier, and a  
CMOS Class A output structure. Integrating the Hall sensing  
element and the amplifier on a single chip minimizes many  
of the problems normally associated with low voltage level  
analog signals.  
High precision in output levels is obtained by internal gain  
and offset trim adjustments made at end-of-line during the  
manufacturing process.  
Packages: 3 pin SOT23W (suffix LH), and  
3 pin SIP (suffix UA)  
These features make the A1301 and A1302 ideal for use in  
position sensing systems, for both linear target motion and  
rotational target motion. They are well-suited for industrial  
applications over extended temperature ranges, from –40°C  
to 125°C.  
Two device package types are available: LH, a 3-pin SOT23W  
type for surface mount, and UA, a 3-pin ultramini SIP for  
through-hole mount. They are lead (Pb) free (suffix, –T) with  
100% matte tin plated leadframes.  
Not to scale  
Functional Block Diagram  
V+  
VCC  
Voltage  
Regulator  
VOUT  
Out  
Amp  
Gain  
Offset  
CBYPASS  
Trim  
Control  
GND  
A1301-DS, Rev. 5  

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