ADM101EARMZ

Overview

The ADM101EARMZ is a single-channel RS-232 transceiver from the Analog Devices Craft Port series, designed for portable applications. It operates from a single 5 V supply and utilizes an on-board DC-DC converter to generate a -5 V rail, eliminating the need for external negative power sources. 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. The receiver includes Schmitt trigger inputs with 0.2 V hysteresis and withstands continuous voltages exceeding ±30 V. All I/O pins provide ESD protection greater than 15 kV. It is housed in a 10-lead MSOP package.

Feature Summary

• Integrated charge-pump DC-DC converter generates internal negative supply voltage from a single positive source.
• Ultralow power shutdown mode disables the charge pump while keeping the receiver functional.
• Receiver inputs feature Schmitt triggers with built-in hysteresis for noise immunity.
• High overvoltage tolerance allows receiver inputs to withstand continuous voltages beyond standard limits.

Applications

• Mobile telephones
• Palmtop computers
• Portable instrumentation

Procurement Notes

Verify the specific ordering suffix when purchasing. The 'Z' suffix indicates RoHS compliance. Ensure the package type matches the design requirements, as this component uses a 10-lead Mini Small Outline Package (MSOP). Confirm that the selected variant meets the necessary automotive or industrial temperature specifications if required by the application environment.

Selection Notes

Select this component for designs requiring minimal external components due to the integrated charge pump. It is suitable for space-constrained portable devices where low power consumption is critical. Verify that the system operates within the specified 4.5 V to 5.5 V supply range. Consider the shutdown pin functionality for battery-powered applications requiring extended standby periods.

Part Context

The ADM101EARMZ belongs to the Analog Devices Craft Port series, which focuses on compact, low-power interface solutions. This specific part number represents the RoHS-compliant version of the ADM101E transceiver. It is distinct from automotive-grade variants, such as the ADM101EW models, which undergo controlled manufacturing processes for higher reliability standards.

Replacement Considerations

Direct replacements include other parts within the ADM101E family, such as the ADM101EARM or ADM101EARM-REEL7, which share identical electrical characteristics and pinouts but differ in packaging format.

FAQ

How does the device handle negative voltage generation?

The ADM101EARMZ uses an internal charge-pump DC-DC converter to generate a -5 V supply from the single 5 V input, removing the need for an external negative power rail.

What is the function of the Shutdown (SD) pin?

Driving the SD pin high puts the device into an ultralow power shutdown mode, disabling the charge pump and transmitter while leaving the receiver active. A logic low enables normal operation.

Is the receiver protected against overvoltage?

Yes, the receiver inputs are protected against continuous voltages exceeding ±30 V, providing robustness in harsh electrical environments.