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| 型号： | MAX19994AETX+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 24/28页 |
| 文件大小： | 0K |
| 描述： | IC MIXER DOWN CONV DUAL 36-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| RF 型： | GSM，EDGE，CDMA |
| 频率： | 1.2GHz ~ 2GHz |
| 混频器数目： | 2 |
| 增益： | 8.4dB |
| 噪音数据： | 9.8dB |
| 次要属性： | 降频变频器 |
| 电流 - 电源： | 330mA |
| 电源电压： | 3.3V，5V |
| 包装： | 带卷 (TR) |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
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Dual, SiGe, High-Linearity, 1200MHz to 2000MHz
Downconversion Mixer with LO Buffer/Switch
details). Operation beyond these ranges is possible;
see the Typical Operating Characteristics for additional
information.
Although this device is optimized for a 1450MHz to
2050MHz LO frequency range, it can operate with
even lower LO frequencies to support 1200MHz to
1700MHz low-side LO injection architectures. However,
performance degrades as f LO continues to decrease.
Contact the factory for a variant with increased low-side
LO performance.
RF Port and Balun
The RF input ports for both the main and diversity chan-
nels are internally matched to 50 I , requiring no exter-
nal matching components when operating the device
over a 1200MHz to 1700MHz RF frequency range.
A DC-blocking capacitor is required as the input is
internally DC shorted to ground through the on-chip
balun. The RF port input return loss is typically better
than 15dB over the 1200MHz to 1700MHz RF frequency
range.
The RF inputs of the device can also be matched to
operate over an extended 1700MHz to 2000MHz RF
frequency range of with the addition of two shunt 4.7nH
inductors. See Table 1 for details.
LO Inputs, Buffer, and Balun
The device is optimized for a 1450MHz to 2050MHz
LO frequency range. As an added feature, the device
includes an internal LO SPDT switch for use in 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 50ns, which is more than
adequate for typical GSM applications. If frequency hop-
ping is not employed, simply set the switch to either of
the LO inputs. The switch is controlled by a digital input
(LOSEL), where logic-high selects LO1 and logic-low
selects LO2. LO1 and LO2 inputs are internally matched
to 50 I , requiring only 39pF DC-blocking capacitors.
If LOSEL is connected directly to a logic source, then
voltage MUST be applied to V CC before digital logic
is applied to LOSEL to avoid damaging the part.
Alternatively, a 1k I resistor can be placed in series at
the LOSEL to limit the input current in applications where
LOSEL is applied before V CC .
The main and diversity channels incorporate a two-stage
LO buffer that allows for a wide-input power range for
the LO drive. The on-chip low-loss baluns, along with LO
buffers, drive the double-balanced mixers. All interfacing
24
and matching components from the LO inputs to the IF
outputs are integrated on-chip.
High-Linearity Mixer
The core of the MAX19994A dual-channel downconvert-
er consists of two double-balanced, high-performance
passive mixers. Exceptional linearity is provided by the
large LO swing from the on-chip LO buffers. When com-
bined with the integrated IF amplifiers, the cascaded
IIP3, 2LO - 2RF rejection, and noise-figure performance
are typically +25dBm, 68dBc, and 9.8dB, respectively.
Differential IF
The device has a 50MHz to 500MHz IF frequency range,
where the low-end frequency depends on the frequency
response of the external IF components. Note that these
differential ports are ideal for providing enhanced IIP2
performance. Single-ended IF applications require a
4:1 (impedance ratio) balun to transform the 200 I dif-
ferential IF impedance to a 50 I single-ended system.
After the balun, the return loss is typically 13dB. The user
can use a differential IF amplifier on the mixer IF ports,
but a DC block is required on both IFD+/IFD- and IFM+/
IFM- ports to keep external DC from entering the IF ports
of the mixer.
Applications Information
Input and Output Matching
The RF and LO inputs are internally matched to
50 I when operating over 1200MHz to 1700MHz and
1450MHz to 2050MHz frequency ranges, respectively.
No matching components are required for operation
within these bands. The RF port input return loss is
typically better than 15dB over the 1200MHz to 1700MHz
RF frequency range and return loss at the LO ports is
typically better than 15dB over the entire LO range. RF
and LO inputs require only DC-blocking capacitors for
interfacing.
If operating the device over the Extended RF Band of
1700MHz to 2000MHz, simply change the DC-blocking
capacitors to 1.8pF and add a shunt 4.7nH inductor to
each RF port. See Table 1 for details. When matched with
this alternative set of elements, the RF port input return
loss is typically better than 14dB over the 1700MHz to
2000MHz band.
The IF output impedance is 200 I (differential). For evalu-
ation, an external low-loss 4:1 (impedance ratio) balun
transforms this impedance to a 50 I single-ended output
(see the Typical Application Circuit ).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX19994AEVKIT# | 功能描述:射频开发工具 RF and RFID RF Evaluation & Development Kits & Boards - KIT EVAL FOR MAX19994A MIXER 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 |
| MAX19995AETX+ | 功能描述:上下转换器 High-Gain 1.2GHz to 2GHz 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 |
| MAX19995AETX+T | 功能描述:上下转换器 High-Gain 1.7GHz to 2.2GHz 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 |
| MAX19995AEVKIT# | 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 |
| MAX19995ETX+ | 功能描述:上下转换器 High-Gain 1.7GHz to 2.2GHz 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 |
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