AS3977 Is A Low-power Fully Integrated ETSI, FCC And ARIB Compliant FSK Transmitter

The AS3977 is a low-power fully integrated ETSI, FCC and ARIB compliant FSK transmitter capable of operating at any ISM frequency in the range of 300 to 928 MHz. It is based on a sigma-delta controlled fractional-N synthesiser Phase locked loop with fully integrated voltage controlled Oscillator The power Amplifier output is programmable and CAN deliver output power ranging from 20dBm up to +10dBm. An on-chip low drop-out Regulator is available in case an accurate output power independent of voltage supply variation is required. The output signal CAN be shaped using a programmable Gaussian Filter to minimise the occupied bandwidth and adjacent channel power. The maximum data rate CAN be up to 100 kb/s depending on the required filtering. The FSK frequency deviation is programmable up to a maximum of 64kHz. The crystal Oscillator CAN handle a wide range of frequencies. For narrow-band applications a Temperature Sensor with digital read-out is included that allows compensation of the crystal frequency drift due to temperature variation. The AS3977 is connected to an external Microcontroller via a bi-directional digital Interface The device operates at very low current consumption with a power supply range from 2.0V to 3.6V and CAN be powered down when not in use. The device is fabricated in austriamicroystems advanced 0.35um SiGe-BiCMOS technology.
By ams AG
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