ADM3311EARU

ADM3311EARU application field and working principle

The ADM3311EARU is a medium-speed RS-232 driver/receiver that combines the features needed to easily interface the system to a wide variety of PC serial ports. The receiver features low input bias and offset current and provides a fail-safe feature in which the receiver output state is constant when the input is open, shorted, or as high as +/- 30 V. This feature eliminates the need for external terminating resistors. In addition, the receiver has an active current limiting circuit.

The driver portion consists of an open-drain output driver capable of sinking up to 8 mA of current. The driver includes an ESD protection network that can safely withstand +/- 15kV ESD on the output pin. The ADM3311EARU is available in two different versions with low and high power consumption. It also has a wide operating voltage range from 2.8 to 5.5 V. It is offered in a SOIC-8 package.

Application fields

The ADM3311EARU is designed for industrial automation, medical devices, point of sale terminals, embedded systems, laptops, PDAs, and any other systems that need data communication. It is also suitable for high-speed systems such as HVAC, transportation, and power. Additionally, it can be used in 96-bit address mode RS-232 applications, enabling faster connection speeds.

Working principle

The ADM3311EARU incorporates its transmitter and receiver functionality into a single chip. Its transmitter portion is a driver, which is responsible for converting the input TTL or CMOS signal level into the signal that is normally used in RS-232 communication. It is capable of working with 3.3V or 5V level signals, providing a signal with a maximum voltage rating of 25V. Additionally, it provides signal buffering, active current limiting, and ESD protection for its outputs.

The receiver portion is for receiving data. For proper reception, the signal must meet the minimum input requirements of the IC and be correctly matched to the receiver\'s power supply voltage. It also features fail-safe functionality and total noise rejection, which is critical for reliable communication in noise-filled environments. This feature eliminates the need for external resistors to maintain output signal states when the input signal is open, shorted, or as high as 30V.

The ADM3311EARU is designed to ensure reliable data communication in all types of environments. Its low power consumption makes it ideal for embedded applications and the ESD protection and active current limiting allows the chip to withstand wide voltage spikes and noise. It is a versatile RS-232 driver/receiver and is ideal for industrial automation, medical devices, transportation, power, and other applications.