- 您现在的位置：买卖IC网 > PDF目录383346 > MAX2244 (Maxim Integrated Products, Inc.) 2.5GHz, 22dBm/20dBm Power Amplifiers with Analog Closed-Loop Power Control PDF资料下载
参数资料
| 型号： | MAX2244 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 2.5GHz, 22dBm/20dBm Power Amplifiers with Analog Closed-Loop Power Control |
| 中文描述： | 2.5GHz、22dBm/20dBm功率放大器，带有模拟闭环功率控制 |
| 文件页数： | 7/14页 |
| 文件大小： | 312K |
| 代理商： | MAX2244 |
M
2.5GHz, 22dBm/20dBm Power Amplifiers with
Analog Closed-Loop Power Control
_______________________________________________________________________________________
7
Detailed Description
The MAX2244/MAX2245/MAX2246 are nonlinear PAs
guaranteed to operate over a 2.4GHz to 2.5GHz fre-
quency range from a 3V to 3.6V single supply. The
MAX2244/MAX2245 provide 22dBm output power, and
the MAX2246 provides 20dBm output power at the
highest power setting. The signal path consists of three
amplifier stages: an input amplifier stage with
adjustable gain, and two fixed-gain amplifier stages.
The PAs have a dual-function input (RFIN/
SHDN
) for
the RF input signal and shutdown control. The shut-
down function is controlled with CMOS level signals,
with a logic low putting the PA into low-current shut-
down. The RF input is internally matched to 50
, elimi-
nating the need for external matching.
The MAX2244/MAX2245/MAX2246 have interstage
matching to optimize output power and efficiency. The last
amplifier stage is open collector using an external pullup
inductor or RF choke. The output match for the PAs also
acts as a lowpass filter that attenuates harmonics.
These PAs provide closed-loop power control to pro-
vide a stable output power with variations in tempera-
ture, V
CC
, and RF input power. The control amplifier
varies the gain of the first stage to equalize the power-
control voltage and the internal power-detector output.
The MAX2244/MAX2246 have a 0.5V to 2V power-con-
trol voltage range, and the MAX2245 has a 0.9V to 2.2V
power-control voltage range.
The internal bias circuit provides separate bias volt-
ages and currents to the amplifier stages. An internal
lowpass RC filter isolates the bias currents, preventing
them from being corrupted by the RF signals. The bias
circuit design also ensures the stability of the PA when
connected to high VSWR loads over all power levels.
Applications Information
Power-Supply Connections
The MAX2244/MAX2245/MAX2246 are designed to oper-
ate from a single, positive supply voltage (V
CC
) with three
connections made to V
CC
: V
CC1
, V
CC2
, and RFOUT bias.
Join the V
CC
traces together using a star layout, which
reduces crosstalk and promotes stable operation. At the
common point of the star, connect 10μF and 10nF de-
coupling capacitors to ground to reduce noise and handle
current transients. Additionally, each leg requires a high-
frequency bypass capacitor and a 1nF power-supply
decoupling capacitor near the IC.
High-frequency bypass capacitors are required close
to the IC. For V
CC1
, connect a capacitor approximately
1mm from the V
CC1
pad. The distance of the capacitor
from the pad affects the impedance at V
CC1
, which
affects output power of the first stage. For optimal out-
put power from stage 1, V
CC1
requires 0.3nH to 0.4nH
inductance.
The output power of the second stage is affected by the
impedance presented to V
CC2
, which is controlled by
the distance between the V
CC2
pad and its bypass
capacitor. For optimal electrical distance, see Figure 1
and Table 1.
RFOUT must be pulled up to V
CC
through an inductor
or an inductive transmission line. If using a transmission
line, a high-frequency bypass capacitor from V
CC
to
ground is necessary to terminate the transmission line
and set its electrical length. The inductance formed by
the length of the transmission line is part of the output-
matching network, and therefore is critical. See the
Output Matching
section for more information on
RFOUT requirements.
Pin Description
PIN
NAME
DESCRIPTION
A1
PC
Power-Control Voltage Input. Adjust PC between 0.5V and 2V (MAX2244/MAX2246) or 0.9V to
2.2V (MAX2245) to adjust output power. Drive PC below 0.3V to shut down the control loop
and put the device in standby mode.
A2
V
CC2
DC Supply-Voltage Connection for the 2nd Stage
A3, B2, C1, C3
GND
Ground Connection. Connect to the PC board ground plane. Provide inductance connection
as low as is practical to the ground plane.
B1
RFIN/
SHDN
RF Input and Digital Shutdown Control Input. RF path internally DC-blocked and matched to
50
. Digital shutdown path is connected to the bias circuitry through a resistor.
B3
RFOUT
PA Open-Collector Output. Requires external pullup inductance for V
CC
bias and external
matching network for optimum output power and efficiency.
C2
V
CC1
DC Supply-Voltage Connection for the 1st Stage, Bias, and Control Circuitry
相关PDF资料 |
PDF描述 |
|---|---|
| MAX2244-MAX2246 | 2.5GHz, 22dBm/20dBm Power Amplifiers with Analog Closed-Loop Power Control |
| MAX2291NCDMAEVKIT | Evaluation Kit |
| MAX2291 | Evaluation Kit |
| MAX2291TDMAEVKIT | Circular Connector; No. of Contacts:6; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:9; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:9-35 RoHS Compliant: No |
| MAX2291WCDMAEVKIT | Circular Connector; No. of Contacts:6; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:9; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:9-35 RoHS Compliant: No |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2244EBL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX2244EBL-T | 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel |
| MAX2244EBL-T10 | 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel |
| MAX2244EVKIT | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Evaluation Kit for the MAX2244/MAX2245/MAX2246 |
| MAX2244-MAX2246 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2.5GHz, 22dBm/20dBm Power Amplifiers with Analog Closed-Loop Power Control |
发布紧急采购，3分钟左右您将得到回复。