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| 型号： | MAX9986AETP+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC MIXER DOWN CONV 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | MAX9986A |
| RF 型： | 手机，DCS，EDGE，PCS，UMTS，WLL |
| 频率： | 815MHz ~ 1GHz |
| 混频器数目： | 1 |
| 增益： | 8.2dB |
| 噪音数据： | 10dB |
| 次要属性： | 降频变频器 |
| 电流 - 电源： | 250mA |
| 电源电压： | 4.75 V ~ 5.25 V |
| 包装： | 带卷 (TR) |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
inputs to a -3dBm to +3dBm range. The IF port incor-
porates a differential output, which is ideal for provid-
ing enhanced IIP2 performance.
Specifications are guaranteed over broad frequency
ranges to allow for use in cellular band GSM,
cdma2000, iDEN, and WCDMA 2G/2.5G/3G base sta-
tions. The MAX9986A is specified to operate over a
815MHz to 1000MHz RF frequency range, a 960MHz
to 1180MHz LO frequency range, and a 50MHz to
250MHz IF frequency range. Operation beyond these
ranges is possible; see the Typical Operating
Characteristics for additional details.
RF Input and Balun
The MAX9986A RF input is internally matched to 50 ? ,
requiring no external matching components. A DC-
blocking capacitor is required because the input is inter-
nally DC shorted to ground through the on-chip balun.
LO Inputs, Buffer, and Balun
The MAX9986A is ideally suited for high-side LO injec-
tion applications with a 960MHz to 1180MHz LO fre-
quency range. For a device with a 570MHz to 850MHz
LO frequency range, refer to the MAX9984 data sheet.
As an added feature, the MAX9986A includes an inter-
nal LO SPDT switch that can be used for frequency-
hopping applications. The switch selects one of the two
single-ended LO ports, allowing the external oscillator
to settle on a particular frequency before it is switched
in. LO switching time is typically less than 50ns, which
is more than adequate for virtually all GSM applica-
tions. If frequency hopping is not employed, set the
switch to either of the LO inputs. The switch is con-
trolled by a digital input (LOSEL): logic-high selects
LO2, logic-low selects LO1. To avoid damage to the
part, voltage must be applied to V CC before digital
logic is applied to LOSEL. LO1 and LO2 inputs are
internally matched to 50 ? , requiring only an 82pF DC-
blocking capacitor.
A two-stage internal LO buffer allows a wide input
power range for the LO drive. All guaranteed specifica-
tions are for an LO signal power from -3dBm to +3dBm.
The on-chip low-loss balun, along with an LO buffer,
drives the double-balanced mixer. All interfacing and
matching components from the LO inputs to the IF out-
puts are integrated on-chip.
High-Linearity Mixer
The core of the MAX9986A is a double-balanced, high-
performance passive mixer. Exceptional linearity is pro-
vided by the large LO swing from the on-chip LO buffer.
When combined with the integrated IF amplifiers, the cas-
caded IIP3, 2LO - 2RF rejection, and NF performance is
typically 25dBm, 69dBc, and 10dB, respectively.
Differential IF Output Amplifier
The MAX9986A mixer has a 50MHz to 250MHz IF fre-
quency range. The differential, open-collector IF output
ports require external pullup inductors to V CC . Note that
these differential outputs are ideal for providing
enhanced 2LO - 2RF rejection performance. Single-
ended IF applications require a 4:1 balun to transform
the 200 ? differential output impedance to a 50 ? single-
ended output.
Applications Information
Input and Output Matching
The RF and LO inputs are internally matched to 50 ? . No
matching components are required. RF and LO inputs
require only DC-blocking capacitors for interfacing.
The IF output impedance is 200 ? (differential). For
evaluation, an external low-loss 4:1 (impedance ratio)
balun transforms this impedance down to a 50 ? single-
ended output (see the Typical Application Circuit ).
Bias Resistors
Bias currents for the LO buffer and the IF amplifier are
optimized by fine tuning resistors R1 and R2. If
reduced current is required at the expense of perfor-
mance, contact the factory for details. If the ±1% bias
resistor values are not readily available, substitute stan-
dard ±5% values.
LEXT Inductor
Short LEXT to ground using a 0 ? resistor. For applica-
tions requiring improved RF-to-IF and LO-to-IF isolation,
LEXT can be used by connecting a low-ESR inductor
from LEXT to GND. See the Typical Operating
Characteristics on RF-to-IF isolation and LO-to-IF leakage
for various inductor values. However, the load impedance
presented to the mixer must be such that any capaci-
tance from both IF- and IF+ to ground do not exceed sev-
eral picofarads to ensure stable operating conditions.
Since approximately 140mA flows through LEXT, it is
important to use a low DCR wire-wound inductor.
Layout Considerations
A properly designed PC board is an essential part of
any RF/microwave circuit. Keep RF signal lines as short
as possible to reduce losses, radiation, and induc-
tance. For the best performance, route the ground pin
traces directly to the exposed pad under the package.
The PC board exposed pad MUST be connected to the
ground plane of the PC board. It is suggested that mul-
tiple vias be used to connect this pad to the lower level
ground planes. This method provides a good RF/ther-
mal conduction path for the device. Solder the exposed
pad on the bottom of the device package to the PC
board. The MAX9986A Evaluation Kit can be used as a
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相关PDF资料 |
PDF描述 |
|---|---|
| MAX9986AEVKIT | EVAL KIT FOR MAX9986 |
| MAX9986ETP+TD | IC MIXER DOWN CONV 20-TQFN |
| MAX9986EVKIT | EVAL KIT FOR MAX9986 |
| MAX9987ETP+ | IC BUFFER/SPLITTER LO 20-TQFN |
| MAX9988EVKIT | EVAL KIT FOR MAX9988 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9986AEVKIT | 功能描述:射频开发工具 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 |
| MAX9986ETP | 功能描述:上下转换器 SiGe 815-1000MHz Downconversion 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 |
| MAX9986ETP+ | 功能描述:上下转换器 SiGe 815-1000MHz Downconversion 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 |
| MAX9986ETP+D | 功能描述:上下转换器 SiGe 815-1000MHz Downconversion 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 |
| MAX9986ETP+T | 功能描述:上下转换器 SiGe 815-1000MHz Downconversion 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 |
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