ADM207EAR-REEL

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The ADM207EAR-REEL is a part of the Interface - Drivers, Receivers, Transceivers family, designed and manufactured by Analog Devices, Inc. It is a fully integrated circuit for level shifting and ESD protection of high speed bi-directional data lines. This part is used in many applications such as: automotive, industrial, communications, wearables, and many more.

Application Field

The ADM207EAR-REEL is primarily suitable for automotive, industrial, communications, and wearables. It can function as a ESD protector for automobile ECUs, Ethernet connections, audio or video line-level signals (like CAN, I2C, SPI, and UART communication). Due to its high speed capabilities, it has been used in other data communication applications like USB and HDMI.

For industrial usage, the ADM207EAR-REEL can also be used to protect large scale data networks connections. It offers ESD protection between bus connector pins that allow reliable operation over wide temperature ranges as well as against ESD and EMI interference. This makes it a robust and reliable solution for harsh industrialised settings.

Communications-wise, this part is suitable for backplane communication in data transmission systems, point-to-point connections, and hand-held communication devices. Moreover, the ADM207EAR-REEL is also suitable for wearables such as e-networked sport gadgets and medical wearables.

Working Principle

The ADM207EAR-REEL is based on Analog Devices’ patented Antifuse technology. This device implements an ESD protection circuit that is capable of withstanding up to 2 kV discharge pulses. The circuit consists of a high performance ESD protector with a built-in low forward voltage drop input buffer, low output impedance, and high speed switching—all interconnected in a small 5-pin SOT-23 package.

Inside the chip, the inputs are equipped with a two stage ESD protection. A capacitive voltage clamp is used to protect incoming signals from ESD. This voltage clamp comprises a low-capacitance diode and a series resistor, as well as CMOS logic gates to control the switching between the ESD protection circuit and the output buffer. Additionally, the components which make up the ESD protection diode are carefully chosen to ensure low threshold voltage.

The output buffer then provides a low output impedance and high speed switching, suppressing the noise from the ESD protection circuit with a series of transistors connected in parallel. This serves as an efficient filter, eliminating any unwanted high frequencies from the data line. Finally, the output buffer will ensure that data transmission is pristine, unimpeded, and robustly protected from ESD interference.

Conclusion

The ADM207EAR-REEL is a fully integrated circuit for level shifting and ESD protection of high speed bi-directional data lines. It is suitable for automotive, industrial, communications, and wearables applications and is based on patented Antifuse technology. This technology provides a two-stage ESD protection circuit consisting of a low-capacitance diode, series resistor, and on-chip CMOS control logic, combined with an output buffer for providing low output impedance and high speed switching. As such, it is a robust and reliable solution for protecting high-speed data lines from unwanted interference.

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