The ACPL-798J is a high-accuracy isolation amplifier designed for voltage and current sensing in electronic power converters and motor drives. Utilizing sigma-delta modulation and chopper-stabilization techniques, the ACPL-798J delivers excellent linearity, low offset drift, and high common-mode transient immunity. This device is ideal for applications demanding accurate and reliable isolated signal sensing.

Applications

• Voltage and current sensing in power inverters
• Motor drives
• Renewable energy systems (solar inverters, wind turbines)
• Uninterruptible power supplies (UPS)
• Isolated analog-to-digital conversion
• Industrial process control
• Medical equipment

Features

• High linearity: 0.05% (typical)
• Low offset drift: 0.5 μV/°C (typical)
• High common-mode transient immunity (CMTI): 50 kV/μs (minimum)
• Wide bandwidth: 200 kHz
• Galvanic isolation
• Compact surface-mount package
• RoHS compliant

Benefits

• Provides accurate and reliable voltage and current measurements, improving the performance and efficiency of power systems.
• Minimizes errors due to temperature variations with its low offset drift.
• Ensures robust operation in noisy environments with its high common-mode transient immunity.
• Enables high-speed data acquisition with its wide bandwidth.
• Protects sensitive control circuitry from high voltages with its galvanic isolation.
• Simplifies circuit design with its compact package and surface-mount compatibility.
• Meets environmental regulations with its RoHS compliance.

Additional Details

The ACPL-798J isolation amplifier converts an analog input signal into a digital bitstream using a sigma-delta modulator. This digital bitstream is then transmitted across an isolation barrier using optical coupling. On the output side, a digital filter and decimator reconstruct the analog signal with high accuracy and linearity. The device features a differential input and a single-ended output. The gain and offset of the amplifier can be adjusted using external resistors. The isolation barrier provides galvanic isolation between the input and output circuits, protecting sensitive control circuitry from high voltages and currents. The ACPL-798J is available in a compact surface-mount package, making it easy to integrate into space-constrained applications. Detailed specifications, application circuits, and performance data can be found in the product datasheet.