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參數(shù)資料
| 型號： | MAX2057ETX-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 衰減器 |
| 英文描述： | 1700MHz to 2500MHz Variable-Gain Amplifier with Analog Gain Control |
| 中文描述： | 1700 MHz - 2500 MHz RF/MICROWAVE NARROW BAND MEDIUM POWER AMPLIFIER |
| 封裝： | 6 X 6 MM, TQFN-36 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 826K |
| 代理商： | MAX2057ETX-T |
M
1700MHz to 2500MHz Variable-Gain
Amplifier with Analog Gain Control
______________________________________________________________________________________
11
Applications Information
Analog Attenuation Control
A single input voltage at the V
CNTL
pin adjusts the gain
of the MAX2057. Up to 21dB of gain-control range is
provided through a single attenuator. At the maximum
gain setting, each attenuator’s insertion loss is approxi-
mately 2.2dB. With the single attenuator at the maximum
gain setting, the device provides a nominal 15.5dB of
cascaded gain and 6dB of cascaded noise figure.
If a larger gain-control range is desired, a second on-
chip attenuator can be connected in the signal path to
provide an additional 21dB of gain-control range. With
the second attenuator connected at the maximum gain
setting, the device typically exhibits 13.3dB of cascad-
ed gain. Note that the V
CNTL
pin simultaneously adjusts
both on-chip attenuators.
The V
CNTL
input voltage drives a high-impedance load
(>250k
). It is suggested that a current-limiting resistor
be included in series with this connection to limit the
input current to less than 40mA should the control volt-
age be applied when V
CC
is not present. A series resis-
tor of greater than 200
will provide complete
protection for 5V control voltage ranges.
Limit V
CNTL
input voltages to a 1.0V to 4.5V range when V
CC
is
present to ensure the reliability of the device.
Amplifier Bias Current
The MAX2057 integrates a two-stage amplifier to simul-
taneously provide high gain and high IP3. Optimal per-
formance is obtained when R1 and R2 are equal to
1.2k
and 2k
, respectively. The typical supply current
is 180mA and the typical output IP3 is 37dBm under
these conditions.
Increasing R
1
and R
2
from the nominal values of 1.2k
and 2k
reduces the bias current of each amplifier
stage, which reduces the total power consumption and
IP3 of the device. This feature can be utilized to further
decrease power consumption for applications that do
not require high IP3.
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 best performance, route the ground-pin
traces directly to the exposed pad underneath the
package. This pad
MUST
be connected to the ground
plane of the board by using multiple vias under the
device to provide the best RF and thermal conduction
path. Solder the exposed pad on the bottom of the
device package to a PC board exposed pad.
Power-Supply Bypassing
Proper voltage-supply bypassing is essential for high-
frequency circuit stability. Bypass each V
CC
pin with
capacitors placed as close to the device as possible.
Place the smallest capacitor closest to the device. Refer
to the MAX2057 evaluation kit data sheet for more details.
Exposed Paddle RF and Thermal
Considerations
The EP of the MAX2057’s 36-pin thin QFN-EP package
provides a low-thermal-resistance path to the die. It is
important that the PC board on which the IC is mounted
be designed to conduct heat from this contact. In addi-
tion, the EP provides a low-inductance RF ground path
for the device.
The EP
MUST
be soldered to a ground plane on the PC
board either directly or through an array of plated via
holes. Soldering the pad to ground is also critical for
efficient heat transfer. Use a solid ground plane wher-
ever possible.
DESIGNATION
VALUE
TYPE
C1, C3, C5, C7, C10
22pF
Microwave capacitors
(0402)
C2, C4, C6, C8, C9
1000pF
Microwave capacitors
(0402)
C13, C14, C15
0.1μF
Microwave capacitors
(0603)
C17
0.75pF
Microwave capacitor
(0402)
R1
R2
1.2k
2k
±1% resistor (0402)
±1% resistor (0402)
Table 1. Typical Application Circuit
Component Values
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX2057 | Evaluation Kit |
| MAX2057_1 | Evaluation Kit |
| MAX2057EVKIT | Evaluation Kit |
| MAX206E | ±5kV ESD-Protected, +5V RS-232 Transceivers(5V,120kbps,自關(guān)閉方式, ESD保護(hù),RS-232收發(fā)器) |
| MAX211E | ±5kV ESD-Protected, +5V RS-232 Transceivers(5V,120kbps,自關(guān)閉方式, ESD保護(hù),RS-232收發(fā)器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2057EVKIT | 功能描述:放大器 IC 開發(fā)工具 RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX2058 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:700MHz to 1200MHz High-Linearity, SPI-Controlled DVGA with Integrated Loopback Mixer |
| MAX2058ETL | 功能描述:射頻放大器 0.7GHz - 1.2GHz SPI-Controlled DVGA RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| MAX2058ETL+ | 功能描述:射頻放大器 0.7GHz - 1.2GHz SPI-Controlled DVGA RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| MAX2058ETL+T | 功能描述:射頻放大器 0.7GHz - 1.2GHz SPI-Controlled DVGA RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
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