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MAX2687/MAX2689/MAX2694
GPS/GNSS Low-Noise Amplifiers
Bump Configuration
TOP VIEW
+
MAX2687
MAX2689
MAX2694
V CC
RFIN
A1
B1
A2
B2
RFOUT (SHDN)
GND
WLP
Bump Description
BUMP
A1
A2
B1
B2
NAME
V CC
RFOUT
( SHDN )
RFIN
GND
FUNCTION
Supply Voltage. Bypass to ground with a 10pF capacitor as close as possible to the IC.
RF Output/ SHDN Input. RFOUT is internally matched to 50 I and pulled up to V CC through a 1M I
resistor. SHDN is shared with the RFOUT bump. The devices are in active mode by default once
V CC is applied. RFOUT( SHDN ) can be pulled to a DC low through a 25k I resistor to shut down
the IC.
RF Input. Requires a DC-blocking capacitor and external matching components.
Ground. Connect to the PCB ground plane.
Detailed Description
The MAX2687/MAX2689/MAX2694 are LNAs designed
for GPS L1, Galileo, and GLONASS applications. The
devices feature an optional power-shutdown control
mode to eliminate the need for an external supply switch.
The devices achieve high gain, low noise figure, and
excellent linearity.
Input and Output Matching
The devices require an off-chip input matching. Only
an inductor in series with a DC-blocking capacitor is
needed to form the input matching circuit. The Typical
Application Circuit shows the recommended input-
matching network. These values are optimized for the
best simultaneous gain, noise figure, and return loss
performance. The value of the input coupling capacitor
Maxim Integrated
affects IIP3. A smaller coupling capacitor results in lower
IIP3. The devices integrate an on-chip output matching
to 50 I at the output, eliminating the need for external
matching components. Tables 1 and 2 list typical device
S parameters and K f values. Typical noise parameters
are shown in Tables 3 and 4.
Shutdown
The devices include an optional shutdown feature to
turn off the entire chip. The devices are placed in active
mode by default once V CC is applied, due to the on-chip
pullup resistor to V CC at the RFOUT bump (shared with
the SHDN input). To shut down the part, apply a logic-
low to the RFOUT bump through an external resistor with
an adequate value, e.g., 25k I , in order not to load the
RF output signal during active operation.
7
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MAX2694EVKIT+ 功能描述:放大器 IC 开发工具 MAX2694 Eval Kit 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
MAX2694EWS+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAX2694EWS+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
MAX2695EVKIT# 功能描述:射频开发工具 MAX2695 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V
MAX2695EWS+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
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MAX2700ECM 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX2700ECM+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: