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参数资料
| 型号： | MAX2235EVKIT |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX2235 |
| 标准包装： | 1 |
| 系列： | * |
+3.6V, 1W Autoramping Power
Amplifier for 900MHz Applications
Typical Operating Circuit
JU2
SMA
J1
100pF
8.2nH
1
2
RFIN
GND
GC
SHDN
20
19
470pF
1000pF
3
2
V CC
JU1
V CC
3
V CC
GND
18
470pF
1000pF 1
1000pF
100pF
100pF
22pF
4
5
6
V CC
V CC
GND
MAX2235
GND
RFOUT
RFOUT
17
16
15
*
1500pF
68pF
V CC
J2
SMA
7
8
GND
V CC
GND
GND
14
13
47pF
11pF
V CC
1000pF
100pF
9 V CC
10 GND
REF 12
RAMP 11
0.068 μ F
J3
V CC
J4
0.01 μ F
1 μ F
* VALUE OF OUTPUT INDUCTOR DEPENDS ON APPLICATION.
Detailed Description
The MAX2235 power amplifier (PA) operates over a
wide frequency range of 800MHz to 1000MHz. The sig-
nal path consists of three stages: the input stage, the
driver stage, and the power stage. There are matching
circuits between the first and second stages, and
between the second and third stages. The bias circuits
process external commands to control the device ’s
power-up/down and the gain of the PA.
Input Stage
The first stage is a variable-gain amplifier with 37dB
gain-control range. The input transistor acts as a
transconductor with constant bias current. Gain control
is achieved by steering the signal current from the input
transistor to the first output matching network (to drive
the second stage) or to a separate supply pin. This
stage operates in class A and remains on in standby
mode to ensure that the VSWR at the input does not
vary more than 1.5:1 compared with normal operation.
The input stage typically requires an external inductor
to achieve an optimum input VSWR.
Second Stage (Driver)
The driver produces a signal large enough to drive the
power stage into saturation. The driver stage operates
in Class C and is off during standby.
Second- and Third-Stage Matching
The interstage matching networks provide optimal load-
ing and power transfer. The circuits are on-chip to save
board space. The bandwidths of the matching net-
works allow the PA to operate over a wide frequency
range.
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2235EVKIT+ | 功能描述:射频开发工具 MAX2235 Eval Kit 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 |
| MAX223C | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:+5V-Powered, Multichannel RS-232 Drivers/Receivers |
| MAX223C/D | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX223CAI | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX223CAI+ | 功能描述:RS-232接口集成电路 5V MultiCh RS-232 Driver/Receiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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