ADM237LJNZ

Overview

The ADM237LJNZ is a CMOS RS-232 transceiver from Analog Devices, designed for single 5 V operation. It integrates five drivers and three receivers in a 24-pin PDIP package. The device generates internal ±10 V supplies using external 1 µF capacitors. It supports data rates up to 120 kbps with an operating current of 13 mA at 5 V. The supply voltage range is 4.75 V to 5.25 V. It operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates on-board DC-to-DC converters to generate required RS-232 voltages from a single 5 V supply.
• Features Schmitt trigger inputs on receivers to ensure error-free reception in noisy environments.
• Includes internal pull-up resistors on transmitter inputs and pull-down resistors on receiver inputs.
• Provides high noise immunity through specified input hysteresis levels.

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific suffix 'JNZ' against the manufacturer's ordering guide to confirm the industrial temperature grade (-40°C to +85°C) and the PDIP-24 package type. Ensure that the design accommodates the four required external 1 µF capacitors for the charge pump circuitry as specified in the datasheet.

Selection Notes

Select this component when a single 5 V supply is available but RS-232 voltage levels are required. It is suitable for applications needing five transmit channels and three receive channels. Verify that the system does not require a low-power shutdown mode, as this specific part lacks the SD pin found in other family members like the ADM236L.

Part Context

This part belongs to the ADM2xxL family of enhanced CMOS RS-232 drivers and receivers. It serves as an upgrade to the older AD2xx series, offering lower power consumption and faster slew rates. The L-series designation indicates compatibility with smaller 1 µF capacitors compared to previous generations.

Replacement Considerations

Public confirmed substitute part numbers include MAX237CNG+ and MAX237ENG+. These parts share similar functionality and pin configurations within the RS-232 interface category.

FAQ

Does the ADM237LJNZ have a shutdown pin?

No, the ADM237LJNZ does not feature a shutdown (SD) or enable (EN) pin. Only the ADM236L, ADM239L, and ADM241L in this family include these control inputs.

What is the maximum data rate supported by this device?

The device supports data rates up to 120 kbps while maintaining compliance with EIA-232-E specifications.

How many external capacitors are required for operation?

Four external 1 µF capacitors are required to support the internal charge pump voltage converters for generating the positive and negative supply rails.