Description
The Isolation Amplifier IC A7840 is intended for use in electronic motor drives to sense current. The A7840 detects the analogue voltage drop that results from motor currents flowing through an external resistor in a typical design. On the other side of the optical isolation barrier made by the A7840, a differential output voltage is produced. An op-amp can be used to transform this differential output voltage, which is proportional to the motor current, into a single-ended signal.
Features
- Fully differential circuit topology
- Advanced Sigma-Delta (∑-∆) A/D converter technology
- 100 kHz bandwidth
Applications
- Motor Phase and Rail
- Current Sensing
- Inverter Current Sensing
- Switched Mode Power
- Supply Signal Isolation
- General Purpose Current
- Sensing and Monitoring
- General Purpose Analog
- Signal Isolation
Specification
| Model | A7840 |
| Type | Isolation Amplifier |
| Package Style | SOP |
| Supply Voltage Range | 4.5V to 5.5V |
| Operating Supply Current | 15.5mA |
| Isolation Voltage | 3750 Vrms |
| Amplifier Type | Isolation |
| Number of Channels | 1 Channel |
| Output Type | Analog to Digital Converter |
| Common Mode Rejection Ratio | 76.1 dB |
| Bandwidth | 100 kHz |
| Input Offset Voltage | 300uV |
| Operating Temperature Range | –40°C to +85°C |
| Country of Origin | China |