ISO7221CDR Isolators

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Digital isolators are devices that electronically isolate two circuits from each other. They protect circuits from damage due to current, voltage, and temperature changes. In particular, they are widely used in equipment with higher safety requirements such as medical, automotive or military, notes that it is best to adopt a digital isolator-type electrical isolation structure.

ISO7221CDR is one popular digital isolator. It provides digital isolation between any two digital signal electrical circuits. According to its datasheet, ISO7221CDR has many features include -80 to 85 degree operating temperature range, low signal propagation delay, very good common mode rejection (CMR) performance, low static power consumption, galvanic digital isolation up to 5 kV and 6 MHz of signal bandwith.

Given its features, ISO7221CDR application field mainly located in medical devices, industrial equipments, consumer, automotive, industrial automation, electric grids, power supplies, etc.

The working principle of ISO7221CDR is based on transformer which forms digital isolator. A digital transmitter and receiver are also included in ISO7221CDR isolator, while the digital isolator acts as the core element. The transmitter basically converts the digital input signal to the high-frequency signal, then transmitting to the high-frequency transformer which act as isolation medium. And then the high-frequency signal will be received by the receiver and converted to the identical digital output signal.

As mentioned, ISO7221CDR is widely used due to its various features. It has the advantages of high-frequency transformer, RoHS compliance, low EMI noise, direct board mounting, and reduced system costs. Moreover, ISO7221CDR isolator ensures both the transmitter and receiver are located on two independent isolated grounds, thus blocks any noise and other direct main power hazard come into the output from the transmitter.

In conclusion, ISO7221CDR is a digital isolator, mainly applicable in medical devices, industrial equipments, consumer, automotive, industrial automation, electric grids, power supplies, etc. Its feature mainly include wide operating temperature range, low signal propagation delay, excellent CMR performance, very low static power consumption, up to 5kV isolation tested, go green and direct board mounting. With all these advantages ISO7221CDR is expected to become one of the widely used digital isolator in the near future.

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