Broadcom ACPL-7900-500E

The ACPL-790B/790A/7900 isolation amplifiers are designed for current and voltage sensing in electronic power converters, with applications including motor drives and renewable energy systems. In a typical motor drive application, current flows through an external resistor, and the resulting analog voltage drop is detected by the isolation amplifier. A differential output voltage proportional to the current is produced on the other side of the optical isolation barrier.

For general applications, the ACPL-790A (gain tolerance ±1%) and ACPL-7900 (gain tolerance ±3%) are recommended. For high-precision applications, the ACPL-790B (gain tolerance ±0.5%) is available. The device operates from a single 5V supply and delivers excellent linearity and dynamic performance with a 62dB SNR. Its 200kHz bandwidth and fast 1.6μs response time enable capture of transient signals under short-circuit and overload conditions. The ACPL-790B/790A/7900 features 15kV/μs high common-mode transient immunity, enabling accurate and stable motor current monitoring in high-noise motor control environments and providing smoother control (reduced "torque ripple") across a wide range of motor control applications.

Combined with superior optocoupler technology, the ACPL-790B/790A/7900 incorporates a Σ-Δ ADC, a chopper-stabilized amplifier, and a fully differential circuit topology, delivering unmatched isolation-mode noise rejection, low offset, high gain accuracy, and stability. The device is housed in a compact, auto-insertable DIP-8 package and complies with global regulatory safety standards.

• ACPL-790B gain accuracy up to ±0.5%
• Gain drift as low as -50ppm/°C
• Input offset voltage of 0.4mV
• Excellent linearity of 0.05%
• SNR of 62dB
• Wide bandwidth up to 200kHz
• Output-side supply range: 3V to 5.5V
• Operating temperature range: -40°C to +105°C
• Advanced Σ-Δ ADC technology
• Fully differential isolation amplifier
• Common-mode transient immunity of 15kV/μs
• Compact, auto-insertable DIP-8 package
• Safety and regulatory certifications: IEC/EN/DIN EN 60747-5-5: 891V peak working insulation voltage; UL 1577: 5000Vrms/1-minute double protection rating; CSA: Component Acceptance Notice #5

• Current/voltage sensing in AC and servo motor drives
• Solar inverters, wind turbine inverters
• Industrial process control
• Data acquisition systems
• Switching power supply signal isolation
• General-purpose analog signal isolation
• Traditional current transformer replacement