MAX3130, MAX3131 3V To 5.5V, IrDA Infrared Transceiver With Integrated RS-232 Interface

The MAX3130 MAX3131 combine an IrDA 1.2 compatible infrared transceiver with an RS-232 interface-all in a single 3V-powered hybrid microcircuit. The infrared transceiver supports IrDA data rates of 2.4kbps to 115kbps. The infrared receive channel provides a high-gain/low-noise PIN-diode Amplifier with 100A of ambient Photodiode current rejection at a +3V supply. A high-power LED Driver capable of sinking 200mA is included in the infrared transmit path. The on-board encoder/decoder (ENDEC) compresses/stretches signals to and from the external UART allowing IrDA Communication even with non-IrDA UARTs
A 2-driver/2-receiver RS-232 transceiver supports data rates up to 120kbps. A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. Selectable shutdown for IR and RS-232 circuitry reduces supply current to 1A.
The MAX3130 is optimized for applications using a single UART for both infrared and RS-232 Communication The infrared transmitter input and infrared receiver output are multiplexed with one RS-232 transmitter input and one RS-232 receiver output, respectively. The MAX3131 's IrDA transceiver and RS-232 transceivers are separate and have their own data inputs and outputs.
Both these devices require a minimum of external components: four small 0. 77d 1F capacitors, a Photodiode an infrared LED and a current-setting resistor.
By Maxim Integrated Products