A7840 Isolation Precision Amplifier (DIP-8P)

The HCPL7840, A7840 is an Isolation amplifier family was designed for current sensing in electronic motor drives. In a typical implementation, motor currents flow through an external resistor and the resulting analog voltage drop is sensed by the HCPL-7840. A differential output voltage is created on the other side of the HCPL-7840 optical isolation barrier. This differential output voltage is proportional to the motor current and can be converted to a single-ended signal by using an op-amp as shown in the recommended application circuit. Since common-mode voltage swings of several hundred volts in tens of nanoseconds are common in modern switching inverter motor drives, the HCPL-7840 was designed to ignore very high common mode transient slew rates (of at least 10 kV/μs).

The high CMR capability of the HCPL-7840 isolation amplifier provides the precision and stability needed to accurately monitor motor current in high noise motor control environments, providing for smoother control (less “torque ripple”) in various types of motor control applications.

Features:

Specifications:

1. Model A7840
2. Type Isolation Amplifier
3. Package Style SOP
4. Supply Voltage Range 4.5V to  5.5V
5. Operating Supply Current 15.5mA
6. Isolation Voltage 3750 Vrms
7. Amplifier Type Isolation
8. Number of Channels 1 Channel
9. Output Type Analog to Digital Converter
10. Common Mode Rejection Ratio 76.1 dB
11. Bandwidth 100 kHz
12. Input Offset Voltage 300uV
13. Operating Temperature Range –40°C to +85°C

Applications:

1. Motor Phase and Rail Current Sensing
2. Inverter Current Sensing
3. DC Bus Voltage Sensing
4. Switched Mode Power Supply Signal Isolation
5. General Purpose Current Sensing and Monitoring
6. General Purpose Analog Signal Isolation
7. Traditional Hall Effect Sensor Replacement

Packing List:

1Pc * A7840 Isolation Precision Amplifier (DIP-8P)