**ADM211EARUZ: A Comprehensive Technical Overview of the RS-232 Transceiver IC**

The **ADM211EARUZ** is a robust, quad driver and quad receiver **RS-232 transceiver integrated circuit (IC)** from Analog Devices. Designed for data communication interfaces, this IC serves as a critical bridge between a host system's logic-level signals and the higher-voltage, bipolar signals required by the **RS-232 serial communication standard**. It is engineered to operate from a single +5V power supply, utilizing an internal charge-pump voltage converter to generate the necessary positive and negative voltages for RS-232 compliance, thereby eliminating the need for costly dual power supplies.

A key architectural feature of the ADM211EARUZ is its integration of four **Transmit (T1OUT-T4OUT) drivers** and four **Receive (R1OUT-R4OUT) receivers**. The drivers convert TTL/CMOS logic input levels (0V to 5V) into ±5.5V RS-232 output signals, ensuring robust noise immunity and signal integrity over longer cable lengths. Conversely, the receivers translate incoming ±25V RS-232 signals back into clean 5V TTL/CMOS logic levels, providing a critical interface for microcontrollers, UARTs, and other digital logic circuits.

The device is renowned for its **high data rate capability**, supporting signals up to **200 kbps**, which is more than sufficient for most legacy serial port applications, including modems, point-of-sale terminals, and industrial control systems. Its internal charge-pump circuitry requires only four small external 0.1 µF capacitors to generate the RS-232 voltage levels, minimizing the total component count and board space required for implementation. Furthermore, the ADM211EARUZ is designed with **ESD protection** on all RS-232 input/output pins, safeguarding the IC and the system it resides in from electrostatic discharge events exceeding ±15 kV (using the Human Body Model). This makes it exceptionally reliable in harsh electrical environments.

Housed in a compact 16-lead SOIC package, the ADM211EARUZ offers a balance of performance, integration, and physical size. It operates over the industrial temperature range (-40°C to +85°C), making it suitable for a wide array of commercial and industrial applications. Its low power consumption and high level of integration have cemented its role as a go-to solution for modern designs that still require legacy serial communication interfaces.

**ICGOODFIND**

The ADM211EARUZ stands out as a highly integrated, single-supply solution for RS-232 communication. Its combination of a full transceiver set, robust ESD protection, and minimal external component requirement makes it an efficient and reliable choice for designers needing to implement a proven serial interface standard.

**Keywords:**

RS-232 Transceiver

Single +5V Supply

ESD Protection

Charge-Pump Circuit

200 kbps Data Rate