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ACS714
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Improving Sensing System Accuracy Using the FILTER Pin
In low-frequency sensing applications, it is often advantageous
to add a simple RC filter to the output of the device. Such a low-
pass filter improves the signal-to-noise ratio, and therefore the
resolution, of the device output signal. However, the addition of
an RC filter to the output of a sensor IC can result in undesirable
device output attenuation — even for DC signals.
Signal attenuation, ? V ATT , is a result of the resistive divider
effect between the resistance of the external filter, R F (see
Application 6), and the input impedance and resistance of the
customer interface circuit, R INTFC . The transfer function of this
resistive divider is given by:
temperature. Therefore, signal attenuation will vary as a function
of temperature. Note that, in many cases, the input impedance,
R INTFC , of a typical analog-to-digital converter (ADC) can be as
low as 10 k Ω .
The ACS714 contains an internal resistor, a FILTER pin connec-
tion to the printed circuit board, and an internal buffer amplifier.
With this circuit architecture, users can implement a simple
RC filter via the addition of a capacitor, C F (see Application 7)
from the FILTER pin to ground. The buffer amplifier inside of
the ACS714 (located after the internal resistor and FILTER pin
? V ATT = V IOUT ?
?
?
?
?
R INTFC
R F + R INTFC
?
?
.
connection) eliminates the attenuation caused by the resistive
divider effect described in the equation for ? V ATT . Therefore, the
ACS714 device is ideal for use in high-accuracy applications
Even if R F and R INTFC are designed to match, the two individual
resistance values will most likely drift by different amounts over
+5 V
Pin 3 Pin 4
IP– IP–
that cannot afford the signal attenuation associated with the use
of an external RC low-pass filter.
VCC
Pin 8
Allegro ACS706
Application 6. When a low pass filter is constructed
externally to a standard Hall effect device, a resistive
divider may exist between the filter resistor, R F, and
the resistance of the customer interface circuit, R INTFC .
This resistive divider will cause excessive attenuation,
as given by the transfer function for ? V ATT .
0.1 F
Voltage
Regulator
Amp
To all subcircuits
Out
VIOUT
Pin 7
N.C.
Pin 6
R F
Resistive Divider
Input
Application
Interface
Circuit
Low Pass Filter
Gain
Temperature
Coefficient
Offset
C F
1 nF
R INTFC
Trim Control
+5 V
VCC
Pin 8
IP+ IP+
Pin 1 Pin 2
GND
Pin 5
Application 7. Using the FILTER pin
provided on the ACS714 eliminates the
attenuation effects of the resistor divider
Hall Current
Drive
Allegro ACS714
between R F and R INTFC , shown in Appli-
cation 6.
IP+
Pin 1
IP+
Pin 2
IP–
Pin 3
IP–
Pin 4
Sense Temperature
Coefficient Trim
Sense
Trim
Signal
Recovery
0 Ampere
Offset Adjust
Buffer Amplifier
and Resistor
VIOUT
Pin 7
Input
Application
Interface
Circuit
R INTFC
GND
FILTER
Pin 5
Pin 6
C F
1 nF
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
16
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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