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Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
Local-Oscillator Input
The LO port is the high-impedance input of the local-
oscillator buffer. It requires a series DC-blocking
capacitor and a shunt resistor to ground to set the input
impedance. See the Typical Operating Characteristics
for a graph of LO Port Return Loss vs. Frequency.
IF Output Port
The mixer’s downconverted output appears on the dif-
ferential IFOUT+ and IFOUT- pins. The differential out-
put can be converted to a single-ended output, as
shown in the MAX2685 evaluation kit (EV kit). Refer to
the Detailed Description in the MAX2685 EV kit data
sheet.
Shutdown
Drive SHDN low to disable all device functions and
place the MAX2685 in low-power shutdown mode.
Drive SHDN high or connect it to V CC to enable all
device functions.
Applications Information
Layout Considerations
A properly designed PC board is an essential part of
any RF/microwave circuit. Note the IC’s high-frequency
inputs and outputs, and be sure to decouple the DC
supply and control pins.
For power-supply traces and connections, a star topol-
ogy works well. Each V CC node in the circuit has its
own path to the central V CC node and a decoupling
capacitor that provides a low impedance at the RF fre-
quency of interest. The central V CC also has a large
decoupling capacitor. This provides good isolation
between the different sections of the MAX2685.
Chip Information
TRANSISTOR COUNT: 295
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相关代理商/技术参数
MAX2686ELT+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAX2686ELT+T10 制造商:Maxim Integrated Products 功能描述:GPS/GNSS LOW-NOISE AMPLIFIERS - Tape and Reel
MAX2686EVKIT 功能描述:放大器 IC 开发工具 RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V
MAX2686EWS+ 制造商:Maxim Integrated Products 功能描述:GPS/GNSS LOW-NOISE AMPLIFIERS - Rail/Tube
MAX2686EWS+T 功能描述:射频放大器 GPS/GNSS Low-Noise Amp RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX2686EWS+T10 功能描述:射频放大器 GPS/GNSS Low-Noise Amp RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
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