The STW81200 is a dual architecture frequency synthesizer (Fractional-N and Integer-N), that features three low phase-noise VCOs with a fundamental frequency range of 3.0 GHz to 6.0 GHz and a programmable dual RF output divider stage which allows coverage from 46.875 MHz to 6 GHz.

The STW81200 optimizes size and cost of the final application thanks to the integration of low- noise LDO voltage regulators and internally-matched broadband RF outputs.

The STW81200 is compatible with a wide range of supply voltages (from 3.0 V to 5.4 V) providing to the end user a very high level of flexibility which trades off excellent performance with power dissipation requirements. A low-power functional mode (software controlled) gives an extra power saving.

Additional features include crystal oscillator core, external VCO mode and output-mute function.

这是一stw81200双结构频率合成器（小数和整数），具有三的低相位噪声VCO具有3 GHz基波频率范围为6 GHz的射频输出分频器和一个可编程的双阶段允许范围从46.875 MHz到6 GHz。

的stw81200优化最终的应用由于规模和成本低噪声LDO稳压器和内部匹配的宽带射频输出一体化。

是的stw81200具有宽范围的电源电压兼容（从3 V至5.4 V）提供给最终用户一个非常高水平的灵活性，结合了功率耗散要求性能优良。一种低功耗的功能模式（软件控制）提供了一个额外的省电。

附加功能包括晶体振荡器的核心，外部VCO模式输出静音功能。

Key Features

• Output frequency range: 46.875 to 6000 MHz

• Very Low Noise

• Normalized in band phase noise floor: -227 dBc/Hz

• VCO phase noise: -135 dBc/Hz @ 1 MHz offset, 4.0 GHz carrier

• Noise floor: -160 dBc/Hz

• Dual architecture frequency synthesizer: Fractional-N and Integer-N

• Integrated VCOs with automatic center frequency calibration

• Programmable RF output dividers by 1/2/4/8/16/32/64

• Dual RF Output broadband matched with programmable power level and mute function

• External VCO option with 5 V charge pump

• Integrated low noise LDO voltage regulators

• Maximum phase detector frequency: 100 MHz

• Exact frequency mode

• Fast lock and cycle slip reduction

• Differential reference clock input (LVDS and LVECPL compliant) supporting up to 800 MHz

• 13-bit programmable reference frequency divider

• Programmable charge pump current

• Digital lock detector

• Integrated reference crystal oscillator core

• R/W SPI interface

• Logic compatibility/tolerance 1.8 V/3.3 V

• Low Power Functional mode

• Supply Voltage: 3.0 V to 5.4 V

• Small size exposed pad VFQFPN36 package 6 x 6 x 1.0 mm

• Process: BICMOS 0.25 μm SiGe

主要特点

输出频率范围：46.875至6000兆赫

噪音非常低

带内相位噪声地板标准：- 227 dBc / Hz

VCO的相位噪声：135 dBc/Hz @ 1 MHz偏移，4 GHz载波

底噪：- 160 dBc / Hz

双重结构：小数和整数分频频率合成器

自动校准的集成VCO的中心频率

可编程RF输出分频器的1 / 2 / 4 / 8 / 16 / 32 / 64

具有可编程功率级和静音功能的双射频输出宽带匹配

5伏的电荷泵外部振荡器选项

集成的低噪声LDO稳压器

最大相位检测器频率：100兆赫

精确频率模式

快速锁定和循环滑减

差分基准时钟输入（LVDS和lvecpl标准）支持高达800 MHz

13位可编程参考分频器

可编程电荷泵电流

数字锁相检测器

集成参考晶体振荡器

R / W的SPI接口

逻辑兼容/宽容1.8伏/ 3.3伏

低功耗功能模式

电源电压：3伏至5.4伏

小规模的接触垫vfqfpn36包6 x 6 x 1毫米

0.25μm SiGe BiCMOS工艺