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ACS722

High Accuracy, Galvanically Isolated Current Sensor IC With Small Footprint SOIC8 Package

Allegro MicroSystems 

ACS722

High Accuracy, Galvanically Isolated Current Sensor IC

With Small Footprint SOIC8 Package

COMMON ELECTRICAL CHARACTERISTICS1: valid through the full range of TA = –40°C to 150°C , and at VCC =

3.3 V; unless otherwise specif ied

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max. Units

Supply Voltage

Supply Current

Output Capacitance Load

Output Resistive Load

Primary Conductor Resistance

Magnetic Coupling Factor

Rise Time

VCC

ICC

VCC within VCC(min) and VCC(max)

CL

VIOUT to GND

RL

VIOUT to GND

RIP

TA = 25°C

CF

IP = IP(max), TA = 25°C, CL = 1 nF,

BW_SEL tied to GND

tr

IP = IP(max), TA = 25°C, CL = 1 nF,

BW_SEL tied to VCC

3

3.3

3.6

V

–

9

12

mA

–

–

10

nF

4.7

–

–

kΩ

–

0.65

–

mΩ

–

10

–

G/A

–

4

–

μs

–

17.5

–

μs

Propagation Delay

IP = IP(max), TA = 25°C, CL = 1 nF,

BW_SEL tied to GND

tpd

IP = IP(max), TA = 25°C, CL = 1 nF,

BW_SEL tied to VCC

–

1

–

μs

–

5

–

μs

Response Time

tRESPONSE

IP = IP(max), TA = 25°C, CL = 1 nF,

BW_SEL tied to GND

IP = IP(max), TA = 25°C, CL = 1 nF,

BW_SEL tied to VCC

–

5

–

μs

–

22.5

–

μs

Internal Bandwidth

Small signal –3 dB; CL = 1 nF,

BW_SEL tied to GND

BWi

Small signal –3 dB; CL = 1nF,

BW_SEL tied to VCC

–

80

–

kHz

–

20

–

kHz

Noise Density

IND

Input referenced noise density;

TA = 25°C, CL = 1 nF

–

150

–

µA(rms)/

√Hz

Noise

Input referenced noise; BWi = 80 kHz,

IN

TA = 25°C, CL = 1 nF

Input referenced noise; BWi = 20 kHz,

TA = 25°C, CL = 1 nF

–

–

42

–

mA(rms)

21

–

mA(rms)

Nonlinearity

ELIN

Through full range of IP

–

±1

%

Saturation Voltage2

VOH

RL = 4.7 kΩ, TA = 25°C

VCC –

0.33

–

–

V

VOL

RL = 4.7 kΩ, TA = 25°C

–

–

0.33

V

Power-On Time

tPO

Output reaches 90% of steady-state

level, TA = 25°C, IP = IPR(max) applied

–

64

–

μs

1Device may be operated at higher primary current levels, IP , ambient temperatures, TA , and internal leadframe temperatures, provided the Maximum Junction Tem-

perature, TJ(max), is not exceeded.

2The sensor IC will continue to respond to current beyond the range of IP until the high or low saturation voltage; however, the nonlinearity in this region will be

worse than through the rest of the measurement range.

Allegro MicroSystems, LLC

6

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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