MAX2769 pdf datasheet (通用的GPS接

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是業(yè)界第一款通用的單芯片全球?qū)Ш叫l(wèi)星系統(tǒng)(GNSS)接收機(jī)，用于GPS 、GLONASS*以及伽利略導(dǎo)航衛(wèi)星系統(tǒng)。這款直接變頻、低IF GNSS接收器能夠?yàn)榉涓C手機(jī)等消費(fèi)類產(chǎn)品提供優(yōu)異的性能。

MAX2769采用Maxim先進(jìn)的低功率SiGe BiCMOS工藝，能夠以較低的成本提供業(yè)界最高的性能和集成度。單芯片內(nèi)集成了完整的接收鏈路，包括雙輸入LNA、混頻器、鏡頻抑制濾波器、PGA、VCO、N分頻頻率合成器、晶體振蕩器和位復(fù)用ADC。該接收器的總噪聲系數(shù)低至1.4dB。

MAX2769集成了單芯片濾波器，無需有源天線應(yīng)用中的外部IF濾波器，僅需少量外部元件即可構(gòu)建完整的低成本GPS接收機(jī)方案。

MAX2769是目前設(shè)計(jì)最為靈活的一款接收機(jī)。片內(nèi)Σ-Δ N分頻合成器可以在主機(jī)系統(tǒng)所提供的任意參考頻率或晶振頻率下，以±40Hz的精度設(shè)置IF頻率。片上ADC可以同時(shí)為I和Q通道各輸出一位或兩位量化值，或者為I通道輸出三位量化值。提供CMOS或有限差分邏輯電平兩種輸出數(shù)據(jù)格式。

MAX2769采用帶裸焊盤的小尺寸、5mm x 5mm、28引腳薄型QFN封裝。該器件還可提供裸片，詳細(xì)信息請(qǐng)與工廠聯(lián)系。