ACS714LLCTR-30A-T Allegro Microsystems Inc, ACS714LLCTR-30A-T Datasheet - Page 11

• Manufacturer Part Number: ACS714LLCTR-30A-T
• Description: IC, LINEAR CURRENT SENSOR, 10mA, 8-SOIC
• Manufacturer: Allegro Microsystems Inc
• Series: -r

Specifications of ACS714LLCTR-30A-T

• Quiescent Current: 10mA
• Bandwidth: 80kHz
• Sensor Case Style: SOIC
• No. Of Pins: 8
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +150°C
• Polarization: Bipolar
• Current - Sensing: ±30A
• Accuracy: ±1.5%
• Sensitivity: 66mV/A
• Current - Supply: 10mA
• Sensor Type: Hall Effect
• Voltage - Supply: 4.5 V ~ 5.5 V
• Output: 2.5V
• Frequency: 80kHz
• Response Time: 5µs
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ACS714
Definitions of Accuracy Characteristics
Sensitivity (Sens). The change in device output in response to a
1 A change through the primary conductor. The sensitivity is the
product of the magnetic circuit sensitivity (G / A) and the linear
IC amplifier gain (mV/G). The linear IC amplifier gain is pro-
grammed at the factory to optimize the sensitivity (mV/A) for the
full-scale current of the device.
Noise (V
(mV/G) and the noise floor for the Allegro Hall effect linear IC
(≈1 G). The noise floor is derived from the thermal and shot
noise observed in Hall elements. Dividing the noise (mV) by the
sensitivity (mV/A) provides the smallest current that the device is
able to resolve.
Linearity (E
the IC varies in direct proportion to the primary current through
its full-scale amplitude. Nonlinearity in the output can be attrib-
uted to the saturation of the flux concentrator approaching the
full-scale current. The following equation is used to derive the
linearity:
where V
sampled current approximates full-scale ±I
Symmetry (E
output from the IC varies in proportion to either a positive or
negative full-scale primary current. The following formula is
used to derive symmetry:
Quiescent output voltage (V
when the primary current is zero. For a unipolar supply voltage,
it nominally remains at V
V
resolution of the Allegro linear IC quiescent voltage trim and
thermal drift.
Electrical offset voltage (V
put from its ideal quiescent value of V
causes. To convert this voltage to amperes, divide by the device
sensitivity, Sens.
Accuracy (E
tion of the actual output from its ideal value. This is also known
as the total output error. The accuracy is illustrated graphically in
the output voltage versus current chart at right.
IOUT(Q)
100 1–
[ {
IOUT_full-scale amperes
NOISE
= 2.5 V. Variation in V
100
Δ gain × % sat (
LIN
TOT
SYM

). The product of the linear IC amplifier gain
V
V
). The degree to which the voltage output from
2 (V
IOUT
). The accuracy represents the maximum devia-
IOUT(Q)
). The degree to which the absolute voltage
IOUT
_+ full-scale amperes – V
– V
_half-scale amperes – V
CC
V
IOUT
IOUT
= the output voltage (V) when the
OE
⁄ 2. Thus, V
IOUT(Q)
). The deviation of the device out-
_–full-scale amperes
_full-scale amperes – V
IOUT(Q)
). The output of the device
CC
can be attributed to the
CC
/ 2 due to nonmagnetic
P
= 5 V translates into
IOUT(Q)
.
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC
IOUT(Q)
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor

IOUT(Q)
)
)
[ {
–I
Accuracy is divided into four areas:
 0 A at 25°C. Accuracy at the zero current flow at 25°C, with-
 0 A over Δ temperature. Accuracy at the zero current flow
 Full-scale current at 25°C. Accuracy at the the full-scale current
 Full-scale current over Δ temperature. Accuracy at the full-
Ratiometry. The ratiometric feature means that its 0 A output,
V
proportional to its supply voltage, V
used to derive the ratiometric change in 0 A output voltage,
V
The ratiometric change in sensitivity, Sens
P
(A)
IOUT(Q)
out the effects of temperature.
including temperature effects.
at 25°C, without the effects of temperature.
scale current flow including temperature effects.
IOUT(Q)RAT
I
P
(min)
, (nominally equal to V
Output Voltage versus Sampled Current
Accuracy at 0 A and at Full-Scale Current
O e
Accuracy
O e
v r
(%).
v r
Temp erature
Accuracy
25°C Only
Temp erature
100
25°C Only
Accuracy
Accuracy
100

V
IOUT(Q)VCC
Sens
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
V
VCC
V
0 A
CC
Increasing V
CC
Decreasing V
CC
/2) and sensitivity, Sens, are
/ 5 V
Average
/ Sens
/ 5 V
V
/ V
CC
IOUT
IOUT(Q)5V
IOUT
Accuracy
25°C Only
. The following formula is
IOUT
(V)
5V
Full Scale
(V)
RAT

(%), is defined as:
I
P
(max)
O e
Accuracy
v r
+I
Temp erature
P
(A)
11