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MAX2769 pdf datasheet (通用的GPS接
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The MAX2769 is the industry's first global navigation satellite system (GNSS) receiver covering GPS, GLONASS*, and Galileo navigation satellite systems on a single chip. This single-conversion, low-IF GNSS receiver is designed to provide high performance for a wide range of consumer applications, including mobile handsets.
Designed on Maxim's advanced, low-power SiGe BiCMOS process technology, the MAX2769 offers the highest performance and integration at a low cost. Incorporated on the chip is the complete receiver chain, including a dual-input LNA and mixer, followed by the image-rejected filter, PGA, VCO, fractional-N frequency synthesizer, crystal oscillator, and a multibit ADC. The total cascaded noise figure of this receiver is as low as 1.4dB.
The MAX2769 completely eliminates the need for external IF filters by implementing on-chip monolithic filters and requires only a few external components to form a complete low-cost GPS receiver solution.
The MAX2769 is the most flexible receiver on the market. The integrated delta-sigma fractional-N frequency synthesizer allows programming of the IF frequency within a ±40Hz accuracy while operating with any reference or crystal frequencies that are available in the host system. The integrated ADC outputs 1 or 2 quantized bits for both I and Q channels, or up to 3 quantized bits for the I channel. Output data is available either at the CMOS logic or at the limited differential logic levels.
The MAX2769 is packaged in a compact 5mm x 5mm, 28-pin thin QFN package with an exposed paddle. The part is also available in die form. Contact the factory for further information.
Key Features
MAX2769是业界第一款通用的单芯片全球导航卫星系统(GNSS)接收机，用于GPS 、GLONASS*以及伽利略导航卫星系统。这款直接变频、低IF GNSS接收器能够为蜂窝手机等消费类产品提供优异的性能。
MAX2769采用Maxim先进的低功率SiGe BiCMOS工艺，能够以较低的成本提供业界最高的性能和集成度。单芯片内集成了完整的接收链路，包括双输入LNA、混频器、镜频抑制滤波器、PGA、VCO、N分频频率合成器、晶体振荡器和位复用ADC。该接收器的总噪声系数低至1.4dB。
MAX2769集成了单芯片滤波器，无需有源天线应用中的外部IF滤波器，仅需少量外部元件即可构建完整的低成本GPS接收机方案。
MAX2769是目前设计最为灵活的一款接收机。片内Σ-Δ N分频合成器可以在主机系统所提供的任意参考频率或晶振频率下，以±40Hz的精度设置IF频率。片上ADC可以同时为I和Q通道各输出一位或两位量化值，或者为I通道输出三位量化值。提供CMOS或有限差分逻辑电平两种输出数据格式。
MAX2769采用带裸焊盘的小尺寸、5mm x 5mm、28引脚薄型QFN封装。该器件还可提供裸片，详细信息请与工厂联系。
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