ADM101EARM-REEL7

Overview

The ADM101EARM-REEL7 is a single-channel RS-232 transceiver from Analog Devices' Craft Port series, designed for portable applications. It operates from a single 5 V supply and utilizes an internal charge-pump DC-DC converter to generate the required negative voltage, eliminating the need for external negative rails. The device supports transmission rates up to 460 kbit/s with ±4.2 V output swing. Key electrical parameters include a typical supply current of 500 μA and an ultralow power shutdown mode consuming less than 1 μA. It features overvoltage protection on receiver inputs exceeding ±30 V and ESD protection greater than 15 kV. The component is housed in a 10-lead MSOP package.

Feature Summary

• Integrated charge-pump DC-DC converter generates internal negative supply from a single 5 V source.
• Ultralow power shutdown mode reduces current consumption to under 1 μA while keeping the receiver active.
• Receiver inputs feature Schmitt trigger action with hysteresis for noise immunity and slow transition tolerance.
• High overvoltage protection allows receiver inputs to withstand continuous voltages beyond ±30 V.

Applications

• Mobile telephones
• Palmtop computers
• Personal digital assistants (PDAs)
• Portable instrumentation
• GPS receivers

Procurement Notes

Verify the specific ordering suffix to confirm packaging format and compliance status. The REEL7 designation indicates tape and reel packaging. Ensure the Z suffix is present if RoHS compliance is required for the assembly process. Confirm the automotive qualification status if the application demands controlled manufacturing standards, as standard and automotive variants may have distinct reliability specifications.

Selection Notes

Select this component when space constraints and low power consumption are critical design drivers. The integrated charge pump simplifies board layout by removing the need for negative voltage generation circuitry. Verify that the 460 kbit/s data rate meets system requirements. Consider the 10-lead MSOP package dimensions for footprint compatibility. Check if automotive qualification is necessary for the target environment.

Part Context

The ADM101E belongs to Analog Devices' Craft Port series, which focuses on tiny RS-232 transceivers optimized for portable electronics. This series addresses the need for serial communication in devices where full-size interfaces are impractical. The ADM101E specifically provides a compact solution for basic Tx/Rx communication needs without requiring complex power management for dual supplies.

Replacement Considerations

ADM101EARMZ-REEL7

FAQ

How does the ADM101E generate the negative voltage required for RS-232 levels?

It uses an internal highly efficient charge-pump voltage inverter that generates an on-chip −5 V supply from the single 5 V positive supply, requiring only two small external capacitors.

What happens to the receiver during the shutdown mode?

During shutdown mode, the transmitter is disabled and the charge pump is switched off, but the receiver remains functional and active.

What is the maximum voltage the receiver inputs can withstand?

The receiver inputs provide overvoltage protection, allowing them to withstand continuous voltages in excess of ±30 V.