GENERAL DESCRIPTION

The SX1781 is a high-performance low phase noise integer-N frequency synthesizer for wireless communications applications. The circuit embeds a fully integrated PLL (including VCO tank and loop filter), complementary output buffers The divider and power-down settings are programmable via an SPI interface. A Lock Detector pin linked to a squelch function have been designed to ease the software development.

FEATURES

◆ Frequency range:1200 to 1400 MHz

◆ Frequency step: 250 kHz min.

◆ Phase noise: -85 dBc/Hz @ 10 kHz offset

◆ Reference spurs: -67 dBc

◆ Hopping time: 350 µs max.

◆ Operating voltage: 3.0 - 3.6V

◆ Programmable Output Power: up to +5 dBm

◆ Integrated VCO and loop filter

◆ SPI-bus interface

◆ Lock Detect output and squelch

◆ Ultra-low power sleep mode

◆ Complementary RF outputs

◆ Temperature range: -40 to +85°C

◆ 4 x 4 mm MLPQ16 package

◆ Pb-free and RoHS compliant