ADM101EARMZ-REEL7

Overview

The ADM101EARMZ-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 on-chip charge-pump DC-DC converter to generate the required negative voltage, eliminating external negative rails. The device supports transmission rates up to 460 kbit/s with ±4.2 V output swing. It features ultralow power consumption of 500 μA in active mode and 1 μA in shutdown mode. Packaged in a 10-lead MSOP (RM-10), it includes overvoltage protection on receiver inputs exceeding ±30 V and ESD protection greater than 15 kV.

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 approximately 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 against the manufacturer's official documentation to confirm package type and reel specifications. Ensure the component meets RoHS compliance requirements if mandated by the design. Confirm that the automotive qualification status aligns with project needs, as standard and automotive variants may have distinct reliability reports.

Selection Notes

Select this component when space constraints and low power consumption are critical in serial communication designs. The integrated charge pump simplifies bill of materials by removing the need for negative voltage regulators. Verify that the 460 kbit/s data rate suffices for the application, as higher speeds require different interface solutions.

Part Context

This part belongs to the ADM101E family within the Analog Devices Craft Port series. The REEL7 suffix indicates tape and reel packaging configuration. The 'Z' designation confirms RoHS compliance. Automotive qualified versions exist under the ADM101EW prefix, offering controlled manufacturing for automotive environments.

Replacement Considerations

Direct substitutes include other parts from the ADM101E family such as ADM101EARM or ADM101EARM-REEL. Cross-referencing pinouts and electrical characteristics with the original datasheet is essential before substitution.

FAQ

How does the device handle negative voltage generation?

The ADM101E uses an internal charge-pump DC-DC converter driven by a 200 kHz oscillator to generate a negative supply voltage from the single 5 V positive rail, requiring only two small external capacitors.

What is the behavior of the receiver during shutdown mode?

When the shutdown input is set to Logic 1, the charge pump and transmitter are disabled to save power, but the receiver remains functional and active.

What protection features are included for the receiver inputs?

The receiver inputs provide overvoltage protection capable of withstanding continuous voltages in excess of ±30 V and include Schmitt trigger inputs with 0.25 V hysteresis to prevent false triggering from noise.