Overview
The ADM232LAR is a 5 V powered CMOS RS-232 driver/receiver produced by Analog Devices Inc. This component is designed to meet all EIA-232-E and V.28 specifications, making it suitable for various communication interfaces. It operates from a single 5 V power supply and includes on-board DC-DC converters to generate the necessary ±10 V levels for RS-232 communication. The ADM232LAR is particularly useful in applications where a compact, low-power solution is required, such as in computers, peripherals, modems, and printers.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 4.5 to 5.5 | V |
| Maximum Operating Temperature | -40 to +85 | °C |
| Data Rate | 120 | kb/s |
| Number of Drivers | 2 | - |
| Number of Receivers | 2 | - |
| RS-232 Input Voltage Range | -30 to +30 | V |
| RS-232 Input Threshold Low | 0.8 to 1.2 | V |
| RS-232 Input Threshold High | 1.6 to 2.4 | V |
| TTL/CMOS Output Voltage Low | 0.4 | V |
| TTL/CMOS Output Voltage High | 3.5 | V |
| Power Supply Current (No Load) | 1.5 to 4 | mA |
| Shutdown Supply Current | 1 to 10 | µA |
Key Features
- Operates from a single 5 V power supply with on-board DC-DC converters to generate ±10 V levels for RS-232 communication.
- Meets all EIA-232-E and V.28 specifications.
- Supports data rates up to 120 kb/s.
- Includes two RS-232 drivers and two RS-232 receivers.
- Low power shutdown mode available, reducing power dissipation to less than 5 µW.
- No external components required for the ADM233L variant, making it ideal for space-critical applications.
- Internal charge pump voltage converters and level-shifting transmitters and receivers integrated onto the same chip.
- CMOS technology to minimize power dissipation.
- Internal 400 kΩ pull-up resistors on TTL/CMOS inputs and 5 kΩ pull-down resistors on RS-232 inputs.
Applications
- Computers and peripherals.
- Modems and printers.
- Instruments and industrial control systems.
- Battery-powered equipment due to low power shutdown mode.
- Any application requiring EIA-232-E and V.28 compliant RS-232 communication interfaces.
Q & A
- What is the operating voltage range of the ADM232LAR?
The ADM232LAR operates from a single 5 V power supply, with a voltage range of 4.5 V to 5.5 V.
- What is the maximum data rate supported by the ADM232LAR?
The ADM232LAR supports data rates up to 120 kb/s.
- How many RS-232 drivers and receivers does the ADM232LAR have?
The ADM232LAR includes two RS-232 drivers and two RS-232 receivers.
- What are the RS-232 input voltage thresholds for the ADM232LAR?
The RS-232 input voltage thresholds are between 0.8 V to 1.2 V for low and 1.6 V to 2.4 V for high.
- Does the ADM232LAR require external components for operation?
No, the ADM232LAR does not require any external components for operation, although external capacitors are needed for the charge pump voltage converters.
- What is the power consumption in shutdown mode?
In shutdown mode, the power dissipation is reduced to less than 5 µW.
- What are the typical TTL/CMOS output voltage levels for the ADM232LAR?
The TTL/CMOS output voltage levels are typically 0.4 V for low and 3.5 V for high.
- What is the operating temperature range for the ADM232LAR?
The operating temperature range is from -40°C to +85°C.
- Is the ADM232LAR suitable for battery-powered devices?
- What are some common applications for the ADM232LAR?
