A7800 Isolation Precision Amplifier (DIP-8P)
৳ 120.00
The HCPL7800, A7800 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 a differential output voltage is produced.
The HCPL7800, A7800 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-7800(A). A differential output voltage is created on the other side of the HCPL-7800(A) 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-7800(A) was designed to ignore very high common-mode transient slew rates (of at least 10 kV/µs). The high CMR capability of the HCPL-7800(A) 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.
This product can also be used for general analog signal isolation applications requiring high accuracy, stability, and linearity under similarly severe noise conditions. For general applications, we recommend the HCPL-7800 (gain tolerance of ±3%). For precision applications Avago Technologies offers the HCPL-7800A with part-to-part gain tolerance of ±1%. The HCPL-7800(A) utilizes sigma delta (Σ−∆) analog-to-digital converter technology, chopper stabilized amplifiers, and a fully differential circuit topology. Together, these features deliver unequaled isolationmode noise rejection, as well as excellent offset and gain accuracy and stability over time and temperature. This performance is delivered in a compact, auto-insertable, industry standard 8-pin DIP package that meets worldwide regulatory safety standards.
Features:
- Fully differential circuit topology
- Advanced Sigma-Delta (∑-∆) A/D converter technology
- 100 kHz bandwidth
- Fully differential circuit topology
- 0.8 μm CMOS IC technology 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
Specifications:
- 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
Applications:
- Motor Phase and Rail Current Sensing
- Inverter Current Sensing
- DC Bus Voltage Sensing
- Switched Mode Power Supply Signal Isolation
- General Purpose Current Sensing and Monitoring
- General Purpose Analog Signal Isolation
- Traditional Hall Effect Sensor Replacement
Packing List:
1Pc * A7800 Isolation Precision Amplifier (DIP-8P)
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