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| 型号： | MAX19998ETP+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 25/28页 |
| 文件大小： | 0K |
| 描述： | IC MIXER DOWNCONVERSION 20TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| RF 型： | LTE，MMDS，WCS，WiMAX |
| 频率： | 2.3GHz ~ 4GHz |
| 混频器数目： | 1 |
| 增益： | 8.7dB |
| 噪音数据： | 9.7dB |
| 次要属性： | 降频变频器 |
| 电流 - 电源： | 230mA |
| 电源电压： | 3.3 V ~ 5 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） |
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SiGe, High-Linearity, 2300MHz to 4000MHz
Downconversion Mixer with LO Buffer
Detailed Description
The MAX19998 provides high linearity and low noise
figure for a multitude of 2300MHz to 4000MHz WiMAX,
LTE, and MMDS base-station applications. This device
operates over a 2600MHz to 4300MHz LO range and
a 50MHz to 500MHz IF range. Integrated baluns and
matching circuitry allow 50 I single-ended interfaces to
the RF and LO ports. The integrated LO buffer provides a
high drive level to the mixer core, reducing the LO drive
required at the MAX19998’s input to a range of -3dBm
to +3dBm. The IF port incorporates a differential output,
which is ideal for providing enhanced 2RF - 2LO and
2LO - 2RF performance.
RF Input and Balun
The MAX19998 RF input provides a 50 I match when
combined with a series DC-blocking capacitor. This
DC-blocking capacitor is required as the input is inter-
nally DC shorted to ground through the on-chip balun.
When using an 8.2pF DC-blocking capacitor, the RF port
input return loss is typically 17dB over the RF frequency
range of 3200MHz to 3900MHz. See Table 1 for lower
band tuning.
LO Inputs, Buffer, and Balun
The LO input is internally matched to 50 I , requiring
only a 2pF DC-blocking capacitor. A two-stage internal
LO buffer allows for a -3dBm to +3dBm LO input power
range. 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
outputs are integrated on-chip.
High-Linearity Mixer
The core of the MAX19998 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 amplifier, IIP3,
2RF - 2LO rejection, and noise-figure performance are
typically +24.3dBm, 67dBc, and 9.7dB, respectively,
for low-side LO injection architectures covering the
3000MHz to 4000MHz RF band.
Differential IF Output Amplifier
The MAX19998 has a 50MHz to 500MHz IF frequency
range, where the low-end frequency depends on the
frequency response of the external IF components. The
MAX19998 mixer is tuned for a 300MHz IF using 390nH
external pullup bias inductors. Lower IF frequencies
would require higher L1 and L2 inductor values to main-
tain a good IF match. The differential, open-collector IF
output ports require that these inductors be connected
to V CC .
Note that these differential ports are ideal for provid-
ing enhanced 2RF - 2LO performance. Single-ended
IF applications require a 4:1 (impedance ratio) balun to
transform the 200 I differential IF impedance to a 50 I
single-ended system. Use the TC4-1W-17 4:1 transform-
er for IF frequencies above 200MHz and the TC4-1W-7A
4:1 transformer for frequencies below 200MHz. The user
can use a differential IF amplifier or SAW filter on the
mixer IF port, but a DC block is required on both IF+/
IF- ports to keep external DC from entering the IF ports
of the mixer.
Applications Information
Input and Output Matching
The RF and LO inputs provide 50 I matches when
combined with the proper tuning. Use an 8.2pF capaci-
tor value on the RF port for frequencies ranging from
3000MHz to 4000MHz. Use a 3.3nH series inductor and
a 0.3pF shunt capacitor on the RF port for frequencies
ranging from 2300MHz to 2900MHz. On the LO port, use
a 2pF DC-blocking capacitor to cover operations span-
ning the 2600MHz to 4300MHz range.
The IF output impedance is 200 I (differential). For evalu-
ation, an external low-loss 4:1 (impedance ratio) balun
transforms this impedance down to a 50 I single-ended
output (see the Typical Application Circuit ).
Reduced-Power Mode
The MAX19998 has two pins (LOBIAS, IFBIAS) that allow
external resistors to set the internal bias currents. See
Table 1 for nominal values for these resistors. Larger
value resistors can be used to reduce power dissipa-
tion at the expense of some performance loss. If Q 1%
resistors are not readily available, substitute with Q 5%
resistors.
Significant reductions in power consumption can also
be realized by operating the mixer with an optional
supply voltage of 3.3V. Doing so reduces the overall
power consumption by 57% (typ). See the 3.3V Supply
AC Electrical Characteristics table and the relevant 3.3V
curves in the Typical Operating Characteristics section
to evaluate the power vs. performance trade-offs.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX19998EVKIT# | 制造商:Maxim Integrated Products 功能描述:SIGE HIGH-LINEARITY 2300MHZ TO 4000MHZ DOWNCONVERSION MIXER - Boxed Product (Development Kits) |
| MAX19999A | 功能描述:上下转换器 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 |
| MAX19999ETX+ | 功能描述:上下转换器 High-Gain 3GHz to 4GHz Downconv 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 |
| MAX19999ETX+T | 功能描述:上下转换器 High-Gain 3GHz to 4GHz Downconv 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 |
| MAX1999EEI | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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