基于MAX9981芯片简介及应用电路设计

基于MAX9981芯片简介及应用电路设计

字数:6348.页数:27

摘要:

MAX9981 是双的高线性混频器，它综合了一个本机振荡器（本振）开关、一本机振荡缓冲、一本机振荡隔离机和二个有源的混频器。考虑到芯片内各种单端的射频和本振输入，有源混频器除去对附加的中频放大器的需要，这就还要求混频器提供的变换增益为 2.1db 。MAX9981 有源混频器优化以符合需要必要条件的 gsm850 、 gsm900，和 cdma850 基点接收器。这个混频器为个别的线性提供一输入 ip3 大于 +27dbm，综合本振激励器大部分的本振激励电平从 -5dbm 到 +5db，另外，嵌入的高端隔离开关启动急流本振选择小于 250ns ，当做需要 GSM 无线电收发机设计。 MAX9981 生效在一 36 管脚 qfn 封装组件（6mm 6mm）用一焊接裸露衬垫，并且指定工作在 -40°C 到 +85°C 连续温度范围的上方。

The MAX9981 dual high-linearity mixer integrates a local oscillator (LO) switch, LO buffer, LO splitter, and two active mixers. On-chip baluns allow for single-ended RF and LO inputs. The active mixers eliminate the need for an additional IF amplifier because the mixer provides a typical overall conversion gain of 2.1dB.
The MAX9981 active mixers are optimized to meet the demanding requirements of GSM850, GSM900, and CDMA850 base-station receivers. These mixers provide exceptional linearity with an input IP3 of greater than +27dBm. The integrated LO driver allows for a wide range of LO drive levels from -5dBm to +5dBm. In addition, the built-in high-isolation switch enables rapid LO selection of less than 250ns, as needed for GSM transceiver designs.
The MAX9981 is available in a 36-pin QFN package (6mm 6mm) with an exposed paddle, and is specified over the -40°C to +85°C extended temperature range.

关键词：频率范围增益裸露焊盘驱动电气特性封装

Keywords: FREQUENCY RANGE GAIN EXPOSED PADDLE
DRIVE ELECTRICAL CHARACTERISTICS PACKAGE

目   录
摘要..............................................................................3
芯片简介..........................................................................4
主要特性..........................................................................4
MAX9981应用 .....................................................................4
内部结构..........................................................................5
            5、1 内部结构资料....................................................5
            5、2 内部结构图......................................................5
MAX9981电气特性...................................................................6
6.1 MAX9981直流电气特性..........................................................6
6.2 MAX9981交流电气特性..........................................................6
6.3 MAX9981交流电气特性（延续.....................................................7
7、典型工作特性...................................................................9
8、引脚功能.......................................................................21
9、应用电路.......................................................................22
   9.1应用电路图..................................................................22
9.2应用电路零件参数表.............................................................23
10、详细说明......................................................................23
        11、封装组件资料..........................................................25
12、结论..........................................................................26
13、参考文献......................................................................27

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