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LTC1957-2_15

更新时间： 2024-09-26 01:23:07
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 215K
描述
Single/Dual Band RF Power Controllers with 40dB Dynamic Range

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中文翻译

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LTC1957-2_15 数据手册

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LTC1957-1/LTC1957-2  
Single/Dual Band RF Power  
Controllers with 40dB Dynamic Range  
U
DESCRIPTIO  
FEATURES  
The LTC®1957-2 is a dual band RF power controller for  
poweramplifiersoperatinginthe850MHzto2GHzrange.  
The input voltage range is optimized for operation from  
a single lithium-ion cell or 3× NiMH. Several functions  
required for RF power control and protection are inte-  
grated in one small 10-pin MSOP package, thereby  
minimizing PCB area.  
■
Dual Band RF Power Amplifier Control (LTC1957-2)  
Internal Schottky Diode Detector with Improved  
Dynamic Range vs the LTC1757A  
■
■
■
Wide Input Frequency Range: 850MHz to 2GHz  
Autozero Loop Cancels Offset Errors and  
Temperature Dependent Offsets  
■
■
■
■
■
■
■
■
■
■
Wide VIN Range: 2.7V to 6V  
Allows Direct Connection to Battery  
RF Output Power Set by External DAC  
Fast Acquire After Transmit Enable  
The LTC1957-1 is a single output RF power controller  
that is identical in performance to the LTC1957-2 except  
that one output (VPCA) is provided. The LTC1957-1 can  
be used to drive a single RF or dual channel module with  
integral multiplexer. This part is available in an 8-pin  
MSOP package.  
Internal Frequency Compensation  
Rail-to-Rail Power Control Outputs  
Power Control Signal Overvoltage Protection  
Low Operating Current: 1mA  
RF power is controlled by driving the RF amplifier power  
control pins and sensing the resultant RF output power  
via a directional coupler. The RF sense voltage is peak  
detected using an on-chip Schottky diode. This detected  
voltage is compared to the DAC voltage at the PCTL pin  
to control the output power. The RF power amplifier is  
protected against high supply current and high power  
control pin voltages.  
Very Low Shutdown Current: <1µA  
Available in a 8-Pin MSOP Package (LTC1957-1)  
and 10-Pin MSOP (LTC1957-2)  
Pin Compatible with the LTC1757A-X  
Improved Start Voltage Accuracy and Range  
Improved PCTL Input Filtering  
■
■
■
U
APPLICATIO S  
■
Internal and external offsets are cancelled over tempera-  
ture by an autozero control loop, allowing accurate low  
power programming. The shutdown feature disables the  
part and reduces the supply current to <1µA.  
Single and Dual Band GSM/GPRS Cellular Telephones  
■
PCS Devices  
■
Wireless Data Modems  
■
U.S. TDMA Cellular Phones  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
LTC1957-2 Dual Band Cellular Telephone Transmitter  
68Ω  
LTC1957-2  
33pF  
V
IN  
1
2
3
4
5
10  
9
V
V
IN  
CC  
PCA  
PCB  
DIRECTIONAL  
COUPLER  
Li-Ion  
RF  
V
V
DIPLEXER  
8
SHDN  
BSEL  
SHDN  
BSEL  
GND  
900MHz  
RF PA  
7
TXEN  
PCTL  
TXEN  
6
50Ω  
DAC  
1.8GHz/1.9GHz  
RF PA  
1957 TA01  
1
1234567...16

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