參數(shù)資料
型號： MAX2430
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 衰減器
英文描述： Low-Voltage, Silicon RF Power Amplifier/Predriver
中文描述： 800 MHz - 1000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER
文件頁數(shù)： 6/10頁
文件大?。?/td> 181K
代理商： MAX2430
M
Low-Voltage, S ilic on RF Power
Amplifier/Predriver
6
_______________________________________________________________________________________
__________Applic ations Information
Output Matc hing
The optimum internal load impedance seen by RFOUT
is approximately 15
. This on-chip low drive imped-
ance provides maximum power transfer and best effi-
ciency under low (3V) supply conditions where the
voltage-swing headroom is limited. For example, driv-
ing an output power of 21.3dBm (135mW) into 50
translates to a 7.35Vp-p swing at the output. An RF
amplifier would require at least a 4.5V supply to drive a
50
load directly. However, driving 21.3dBm into 15
translates to 4.02Vp-p. The MAX2430 can achieve a
voltage swing of 4.02Vp-p or 2.01Vp from a 3V supply
voltage without saturating the output transistor.
Figure 1 shows the MAX2430 configured for 800MHz to
1000MHz operation. The output matching circuitry con-
verts the desired 50
load impedance to the 15
opti-
mal load seen by the output transistor’s collector. This
configuration uses a low-loss, controlled-Q inductor net-
work. Starting from the RFOUT pin, this network consists
of a series L (which includes the 5nH package parasitic
inductance), series C, and shunt C. The design equa-
tions for this network are as follows:
R1 = Output resistance as seen by the
collector ~15
R
L
= Desired load resistance
The controlled-Q inductor network requires that
(
R
L
> R1 and Q >
pute matching components as given below:
. Choose Q and com-
where
ω
equals the center frequency in radians/second.
Recommended starting values for L1 and L2 are given
in Table 1.
Let A
R x R1
R1
X
X
X
L1 = X / - 5nH of package
inductance
1
X
1
X
Csh
Q x R1
X
R x R1 / A
A
C =
C
=
2
Co
Csh
Co
SH
=
(
)
=
=
=
ω
ω
R / R1
1
)
MAX2430
OUTPUT
BIAS
GAIN
50
50
GND2
GND3
VCC1
V
CC
V
CC
1nF
1nF
2.2nF
VCC2
BIAS
GND4
RFOUT
THREE-ELEMENT
MATCHING NETWORK
C
O
AND C
SH
TUNED FOR MAXIMUM POWER OUTPUT AT THE
DESIRED FREQUENCY BETWEEN 800MHz AND 1000MHz.
MAX2430IEE (PwrQSOP) UNDERSIDE METAL SLUG MUST
BE SOLDERED TOPCB GROUND PLANE.
L2 = 8nH FOR NARROW SOPACKAGE (MAX2430ISE)
L2 = 12nH FOR PwrQSOP PACKAGE (MAX2430IEE)
*
9
5nH
L
C
47nH
R
C
470
L2*
RF OUTPUT
C
SH
C
O
L1
8nH
SHDN
ON
OFF
GND1
RFIN
C
IN
1nF
DRIVER
MASTER
BIAS
15
RF INPUT
R
L
Figure 1. Typical Application Circuit
L1(nH)
400 to 600*
600 to 800*
22
15
800 to 1000
8
Table 1. Recommended L1 and L2 Starting
Values
*Not characterized
f =
ω
/ 2
π
(MHz)
MAX2430ISE
L2(nH)
8
8
12
MAX2430IEE
L2(nH)
12
12
18
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX24305EXG+ 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Not Available From Mouser RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56
MAX2430EVKIT-SO 功能描述:界面開發(fā)工具 RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
MAX2430IEE 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX2430ISE 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX2430ISE-T 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
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