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| 型号： | MAX2642EXT+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP LOW NOISE SC70-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 频率： | 800MHz ~ 1GHz |
| 增益： | 16.7dB |
| 噪音数据： | 4.3dB |
| RF 型： | 手机，ISM，SMR |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电流 - 电源： | 7.5mA |
| 封装/外壳： | 6-TSSOP，SC-88，SOT-363 |
| 包装： | 带卷 (TR) |
900MHz SiGe, High IP3,
Low-Noise Amplifiers
Pin Description
PIN
1
2, 5
3
4
6
NAME
BIAS
GND
RFIN
V CC
RFOUT
FUNCTION
Resistor Bias Control. Connect a resistor, R BIAS , from BIAS to ground. R BIAS sets IP3 and supply
current (see Applications Information ). The current through this pin is approximately 50mV divided
by R BIAS .
Ground. For optimum performance, provide a low-inductance connection to the ground plane.
Amplifier Input. AC-couple to this pin with a DC-blocking capacitor. External matching network is
required for optimum performance.
Supply Voltage. Bypass with a 47pF capacitor directly to ground at the supply pin. Additional
bypassing may be necessary for long V CC lines.
Amplifier Output. Internally matched to 50 ? . DC bias on this pin selects gain mode (MAX2642) or
shutdown mode (MAX2643) (see Applications Information ).
Applications Information
Input Matching
Input matching is required for optimum performance.
The MAX2642/MAX2643 require a simple LC matching
network, as shown in the Typical Operating Circuit . To
further reduce cost and external component count,
replace the external inductor with a microstrip transmis-
sion line. The Typical Operating Circuit shows the rec-
ommended input-matching networks for the MAX2642/
MAX2643 at 900MHz. These values are optimized for
best simultaneous gain, noise figure, and return-loss
performance. To aid in the design of the matching net-
work for other frequencies, Tables 1 – 6 list typical
device S-parameters for various biases, and Tables 7,
8, and 9 list typical device noise parameters.
Attenuation Step (MAX2642)
The MAX2642 ’ s DC bias voltage at RFOUT serves as
an attenuation step input. When the DC voltage at
RFOUT through a 33k ? resistor is less than +0.6V, the
device is in high-gain mode; if the DC voltage is greater
than +2.0V, the device is in low-gain mode. A standard
logic output can be applied as shown in the Typical
Operation Circuit . If no bias is applied, the device is in
high-gain mode.
Shutdown
For the MAX2643, the recommended shutdown method
is to set the DC voltage at the RFOUT pin in a manner
similar to the MAX2642 ’ s attenuation step. That is, when
the DC voltage at RFOUT is below +0.6V, the device is
shut down; if the DC voltage is greater than +2.0V, the
device is enabled.
For the MAX2642, shutdown is achieved by leaving
BIAS unconnected. Figure 1 shows the suggested
shutdown methods. Avoid capacitance at the BIAS pin
by connecting the bias resistor from BIAS to the switch.
Table 10 summarizes the operational modes.
Layout Issues
A properly designed PC board is essential to any
RF/microwave circuit. Use controlled impedance lines
on all high-frequency inputs and outputs. Bypass with
decoupling capacitors located close to the device V CC
pin. For long V CC lines, it may be necessary to add
additional decoupling capacitors. These additional
capacitors can be located farther away from the device
package. Proper grounding of the GND pins is essen-
tial. If the PC board uses a topside RF ground, connect
it directly to all GND pins. For a board where the
ground plane is not on the component layer, the best
technique is to connect the GND pins to the board with
a plated through-hole located close to the package.
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2643EVKIT | 功能描述:放大器 IC 开发工具 MAX2642/43 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 |
| MAX2643EXT | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX2643EXT+ | 制造商:Maxim Integrated Products 功能描述:900MHZ SIGE, HIGH-VARIABLE IP3, LOW-NOISE AMPLIFIER - Bulk |
| MAX2643EXT+T | 功能描述:射频放大器 900MHz SiGe High Variable IP3 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 |
| MAX2643EXT-T | 功能描述:射频放大器 900MHz SiGe High Variable IP3 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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