The Broadcom ACNT-H870 voltage sensors are optical isolation amplifiers designed specifically for voltage sensing. Its 2V input range and high 1-GW input impedance makes it well suited for isolated voltage sensing requirements in electronic power converters applications including motor drives and renewable energy systems. In a typical voltage sensing implementation, a resistive voltage divider is used to scale the DC-link voltage to suit the input range of the voltage sensor. A differential output voltage that is proportional to the input voltage is created on the other side of the optical isolation barrier.

Advanced sigma-delta (Σ–Δ) modulation technology
Unity gain 1V/V, ±05% high gain accuracy (ACNT-H87B)
1 GΩ input impedance
0 to 2V nominal input range
–35 ppm/°C low gain drift
21 μV /°C offset voltage drift
01% non-linearity maximum
Active-high shutdown pin
100 kHz wide bandwidth
3V to 55V wide supply range for output side
–40°C to +110°C operating temperature range
15 kV/μs common-mode transient immunity
Compact, auto-insertable 15-mm Stretched SO-8 package