Data Sheet

Data Sheet
Broadcom ACHS-712x-DS101
February 28, 2018
Overview
The Broadcom
®
ACHS-7121/7122/7123 product series is a
fully integrated Hall Effect-based isolated linear current sensor
device family designed for AC or DC current sensing in
industrial, commercial, and communications systems. Each of
the ACHS-7121/7122/7123 consists of a precise, low-offset,
linear Hall circuit with a copper conduction path located near
the surface of the die. Applied current flowing through this
copper conduction path generates a magnetic field that the Hall
IC converts into a proportional voltage. Device accuracy is
optimized through the close proximity of the magnetic signal to
the Hall transducer.
A precise, proportional voltage is provided by the low-offset,
chopper-stabilized CMOS Hall IC, which is programmed for
accuracy after packaging. The output of the device has a
positive slope (>V
OUT(Q)
) when an increasing current flows
through the primary copper conduction path (from pins 1 and 2,
to pins 3 and 4), which is the path used for current sampling.
The internal resistance of this conductive path is 0.7 mΩ
typical, providing low-power loss. The terminals of the
conductive path are electrically isolated from the signal leads
(pins 5 through 8). This performance is delivered in a compact,
surface mountable, SO-8 package that meets worldwide
regulatory safety standards.
Features
 Wide Operating Temperature: –40ºC to 110ºC
 Primary conductor resistance: 0.7 mΩ typ.
 Sensing current range: ±10A, ±20A, and ±30A
 Output sensitivity: 66 to 185 mV/A
 Output voltage proportional to AC or DC currents
 Ratiometric output from supply voltage
 Single supply operation: 5.0V
 Low-noise analog signal path
 Device bandwidth is set via FILTER pin:
80 kHz typ. Bandwidth with 1 nF filter capacitor
 Factory-trimmed for accuracy
 Extremely stable output offset voltage
 Near zero magnetic hysteresis
 Typical total output error of ±1.5%
 >25 kV/μs Common-Mode Transient Immunity
 Small footprint, low-profile SO-8 package
 Worldwide Safety Approval: UL, CSA:
Isolation Voltage 3 kV
RMS
, 1 minute
Applications
 Low-power inverter current sensing
 Motor phase and rail current sensing
 Solar inverters
 Chargers and Converters
 Switching Power Supplies
Part Number Current Range Sensitivity
ACHS-7121 ±10A 185 mV/A
ACHS-7122 ±20A 100 mV/A
ACHS-7123 ±30A 66 mV/A
ACHS-7121/7122/7123
Fully Integrated, Hall Effect-Based Linear
Current Sensor IC with 3 kV
RMS
Isolation and
Low-Resistance Current Conductor
CAUTION! It is advised that normal static precautions be taken in handling and assembly of this component to prevent
damage and/or degradation which may be induced by ESD. The components featured in this data sheet are not
to be used in military or aerospace applications or environments.