General Description

The AS3901 is a low power FSK/ (ASK) transmitter intended for the European 433 MHz and the US 315 MHz ISM band application. It uses a PLL stabilized oscillator which avoids frequency pulling by approaching the antenna with objects as it occurs at SAW resonator based transmitters.

Key Features

· Supports the European 433 MHz ISM band.

· No frequency pulling by (antenna) load variation due to PLL synthesizer.

· Designed to be conform to EN 300 220-1 requirements.

· Supports FSK (data rates 0… 32 kb/s) or ASK modulation (data rates 0… 20kb/s)

· No data synchronization for FSK or ASK needed.

· Supports clock and reset signals for the external µC.

· Supports different power down modes, one without any running XTAL oscillator.

· Wide supply range between 2.7 V to 5 V.

· Only one XTAL and very few external elements required.

· Wide operating temperature range from –40 C to +85 C.

· Low TX current, typical 7 mA

Applications

· Short range radio data transmission.

· Remote keyless entry systems.

· Security applications and alarm systems.

· Domestic and consumer remote control units.

· Remote metering.

· Low power telemetry.