The ADM202/ADM203 is a two-channel RS-232 line driver/receiver pair designed to operate from a single 5V power supply. It features an internal +10V to -10V voltage inverter and a +5V to +10V voltage doubler.
The ADM202/ADM203 are high‑speed, low‑power CMOS RS‑232 driver/receiver pairs designed for computers, modems, printers and other peripherals. They use an on‑chip charge‑pump to generate the required ±10 V RS‑232 levels from a single +5 V supply, with the ADM203 integrating the external capacitors internally.
The devices meet EIA‑232‑E and V.28 specifications, provide over‑voltage protection up to +30 V on the receiver inputs, and include internal pull‑up/pull‑down resistors for TTL/CMOS and RS‑232 pins. They are offered in 16‑lead DIP, narrow and wide SOIC packages (ADM202) and a 20‑pin DIP package (ADM203).
| Maximum Data Rate | 120 kB |
|---|---|
| Supply Voltage | +5 V (single) |
| Power Supply Current (no load) | 1.5 mA |
| Input Logic Threshold Low | 0.8 V |
| Input Logic Threshold High | 2.0 V |
| RS‑232 Input Voltage Range | -30 V to +30 V |
The devices support up to 120 kB transmission rates.
Both parts operate from a single +5 V power supply.
The ADM202 requires external 0.1 µF charge‑pump capacitors, while the ADM203 has the capacitors integrated and needs none.
The receiver inputs are protected against over‑voltage up to +30 V and have internal 5 kΩ pull‑down resistors.