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参数资料
| 型号： | MAX2690EUB+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC MIXER DOWNCONVERTER 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| RF 型： | 手机，CDMA，ISM，PCS，WLAN |
| 频率： | 400MHz ~ 2.5GHz |
| 混频器数目： | 1 |
| 增益： | 7.9dB |
| 噪音数据： | 12dB |
| 次要属性： | 降频变频器 |
| 电流 - 电源： | 20.1mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 包装： | 管件 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
Low-Noise, 2.5GHz
Downconverter Mixer
__________Applications Information
Local-Oscillator (LO) Input
The LO input is a single-ended broadband 50 ? input with
a return loss of better than 10dB from 900MHz to 3GHz,
improving at high frequency. For lower-frequency LO
operation, a shunt resistor can be used to improve the LO
port match (see the Typical Operating Circuit for more
information). AC couple to LO. The LO signal is mixed
with the input RF signal, and the resulting downconverted
output appears on the IFOUT+ and IFOUT- pins.
RF Input
The typical RF input frequency range is 400MHz to
2.5GHz. For optimum performance, the RF input requires
an impedance-matching network. Consult Table 1 as well
as the RF Port Impedance vs. Frequency graph in the
Typical Operating Characteristics.
Table 1. RF Input Impedance
FREQUENCY
plane. Low-inductance ground connections and con-
trolled-impedance lines should be used in the layout.
To minimize noise on the internal bias cell, SHDN
should be decoupled with a 1000pF capacitor to
ground. A series resistor (typically 100 ? ) can also be
used to reduce high-frequency signals coupling into
the SHDN pin.
Inductive Degeneration Pin (LGND)
A series inductor is typically connected from LGND to
GND. Adjusting the value of this inductor allows the
MAX2690 to be set to the optimum gain and linearity
point for a particular application. A short from LGND to
ground provides maximum linearity. Increasing the induc-
tor value trades off linearity for gain. A large inductor pro-
vides maximum gain. See the Typical Operating
Characteristics for a graph of conversion gain and lineari-
ty for several inductor values. The inductor’s self-resonant
frequency (SRF) should be as close as possible to or
above the desired RF frequency for optimal performance.
______________________Layout Issues
PART
Series Z
Equivalent Shunt R
Equivalent Shunt C
900MHz
45 – j 219 ?
1100 ?
0.7pF
1.95GHz
20 – j 110 ?
630 ?
0.7pF
2.45GHz
18 – j 85 ?
400 ?
0.7pF
A well-designed PC board is an essential part of an RF
circuit. For best performance, pay attention to power-
supply issues as well as the layout of the RFIN match-
ing network.
Power-Supply Layout
To minimize coupling between different sections of the
IC, the ideal power-supply layout is a star configuration,
IF Output
The IF output frequency range is typically 10MHz to
500MHz. The IFOUT+ and IFOUT- pins require external
inductors to V CC for proper biasing. These outputs are
high-impedance open collectors. In many applications,
the biasing inductors have resistors in parallel with
them to set an output impedance. Alternatively, a resis-
tor between IFOUT+ and IFOUT- may be used. Consult
the Typical Operating Characteristics section for more
information.
For single-ended operation, the IFOUT- pin can be tied
directly to V CC .
Power Supply and Bypassing
Proper attention to supply bypassing is essential for a
high-frequency RF circuit. V CC (pin 5) must be properly
bypassed with a 0.1μF capacitor in parallel with
1000pF to ground. Separate vias to the ground plane
are needed for each of the bypass capacitors, as well
as minimal trace length to reduce inductance. Each
ground pin should have a separate via to the ground
which has a large decoupling capacitor at a central
V CC node. The V CC traces branch out from this node,
each going to a separate V CC node in the MAX2690
circuit. At the end of each of these traces is a bypass
capacitor that is good at the RF frequency of interest.
This arrangement provides local decoupling at each
V CC pin. At high frequencies, any signal leaking out
one supply pin sees a relatively high impedance
(formed by the V CC trace inductance) to the central
V CC node, and an even higher impedance to any other
supply pin, as well as a low impedance to ground.
Matching-Network Layout
The layout of the RFIN matching network can be very
sensitive to parasitic circuit elements. To minimize par-
asitic inductance, keep all traces short, and place com-
ponents as close to the chip as possible. To minimize
parasitic capacitance, a cut-out in the ground plane
(and any other planes) below the matching network
components can be used.
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2690EUB+ | 功能描述:上下转换器 Low-Noise 2.5GHz Downconverter Mixer RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| MAX2690EUB+T | 功能描述:上下转换器 Low-Noise 2.5GHz Downconverter Mixer RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| MAX2690EUB-T | 功能描述:上下转换器 Low-Noise 2.5GHz Downconverter Mixer RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| MAX2690EVKIT | 功能描述:射频开发工具 MAX2690 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 |
| MAX2691EVKIT# | 功能描述:放大器 IC 开发工具 MAX2691 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 |
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