ADM207AN

Overview

The ADM207AN is a CMOS RS-232 line transceiver designed for EIA-232-E and V.28 communication interfaces, operating from a single +5 V power supply. It integrates two on-board DC-to-DC converters to generate the required ±10 V levels without external transformers. The device features five drivers and three receivers, supporting data rates up to 120 kB/s with an output voltage swing of ±9 V. It requires four external capacitors ranging from 0.1 μF to 10 μF. The component operates within an industrial temperature range of -40°C to +85°C and includes Schmitt-trigger inputs for noise immunity.

Feature Summary

• Integrates dual charge pump voltage converters to generate internal positive and negative supplies from a single 5 V source
• Provides five TTL/CMOS compatible drivers and three receivers with Schmitt-trigger inputs for signal integrity
• Features internal pull-up resistors on driver inputs and pull-down resistors on receiver inputs to manage unused pins
• Delivers guaranteed ±5 V minimum output swing under worst-case loading conditions

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific package variant when ordering, as the base model number corresponds to multiple physical packages. The 'N' suffix indicates a 24-lead Plastic Dual In-Line Package (PDIP). Confirm RoHS compliance requirements by checking for the 'Z' suffix in the part number. Ensure the design supports the necessary external capacitor footprint for the charge pump circuitry.

Selection Notes

Select this component when a system requires five transmit channels and three receive channels. Unlike other members of the ADM2xx family, this specific part does not include a low-power shutdown mode or an enable pin. Verify that the application does not require battery-saving standby states, as the device lacks the control inputs found in the ADM206 or ADM211 variants.

Part Context

This component belongs to the ADM2xx family of RS-232 drivers and receivers manufactured by Analog Devices. The family shares common architecture but varies in channel count and control features. This specific part serves as a high-channel-count solution within the series, distinct from parts offering shutdown capabilities or different driver/receiver ratios.

Replacement Considerations

The datasheet notes that these parts are essentially plug-in compatible with MAX206-211/213 derivatives. However, verify pinout compatibility and electrical specifications against specific legacy components before substitution.

FAQ

Does the ADM207AN support a low-power shutdown mode?

No, the ADM207AN does not feature a shutdown input. Only the ADM206, ADM211, and ADM213 models in this family include low-power shutdown capabilities.

What is the function of the internal resistors on the inputs?

Each driver input has an internal 400 kΩ pull-up resistor to VCC, and each receiver input has an internal 5 kΩ pull-down resistor to GND. These ensure defined logic states for unconnected pins.

How many external capacitors are required for operation?

Four external capacitors are required: two for the voltage doubler stage and two for the voltage inverter stage of the internal charge pumps.