ACPL-C797-500E

ACPL-C797-500E is a 1bit, second-order sigma-delta modulator. It converts an analogue input signal into a high-speed data stream with galvanic isolation based on optical coupling technology. It operates from a 5V power supply with dynamic range of 80dB with an appropriate digital filter. The differential inputs of ±200mV (full scale ±320mV) are ideal for direct connection to shunt resistors or other low-level signal sources in applications, such as motor phase current measurement. The analogue input is continuously sampled by a means of sigma-delta over-sampling using an on-board clock. It is used in applications such as motor phase and rail current sensing, power inverter current and voltage sensing, industrial process control, data acquisition systems, general purpose current and voltage sensing, traditional current transducer replacements.

• Superior optical isolation and insulation, internal reference voltage
• Wide supply range for digital interface is 3V to 5.5V
• 16bits resolution, integral nonlinearity is 3LSB typ at (TA = -40°C to +85°C)
• Modulator clock output frequency is 10MHz typ at (CL = 15pF, clock duty cycle 40% to 60%)
• Offset drift vs. temperature is 3.5μV/°C max at (VDD1 = 5V, TA = –40°C to +105°C)
• Isolation transient immunity is 25kV/μs typ at (VCM = 1kV, TA = –40°C to +105°C)
• Safety and regulatory approval, signal-to-noise ratio is 78dB typ at (TA = -40°C to +105°C)
• Internal reference voltage is 320mV typ at (TA = -40°C to +105°C, VDD1 = 4.5V to 5.5V)
• Input bias current is -0.3μA typ at (VDD1 = 5V, VDD2 = 5V, VIN+ = 0V)
• Operating temperature range from -40°C to +125°C, SSO-8 package