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LTC1957-2_15

Description
Single/Dual Band RF Power Controllers with 40dB Dynamic Range
File Size203KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1957-2_15 Overview

Single/Dual Band RF Power Controllers with 40dB Dynamic Range

LTC1957-1/LTC1957-2
Single/Dual Band RF Power
Controllers with 40dB Dynamic Range
FEATURES
s
s
DESCRIPTIO
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s
s
s
s
s
s
s
s
s
s
s
s
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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 V
IN
Range: 2.7V to 6V
Allows Direct Connection to Battery
RF Output Power Set by External DAC
Fast Acquire After Transmit Enable
Internal Frequency Compensation
Rail-to-Rail Power Control Outputs
Power Control Signal Overvoltage Protection
Low Operating Current: 1mA
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
The LTC
®
1957-2 is a dual band RF power controller for
power amplifiers operating in the 850MHz to 2GHz range.
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.
The LTC1957-1 is a single output RF power controller
that is identical in performance to the LTC1957-2 except
that one output (V
PCA
) 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.
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.
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Single and Dual Band GSM/GPRS Cellular Telephones
PCS Devices
Wireless Data Modems
U.S. TDMA Cellular Phones
TYPICAL APPLICATIO
68Ω
V
IN
33pF
Li-Ion
SHDN
BSEL
LTC1957-2 Dual Band Cellular Telephone Transmitter
LTC1957-2
1
2
3
4
5
V
IN
RF
SHDN
BSEL
GND
V
CC
V
PCA
V
PCB
TXEN
PCTL
10
9
8
7
6
900MHz
TXEN
RF PA
DIRECTIONAL
COUPLER
DIPLEXER
DAC
1.8GHz /1.9GHz
RF PA
U
50Ω
1957 TA01
U
U
1

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Description Single/Dual Band RF Power Controllers with 40dB Dynamic Range Single/Dual Band RF Power Controllers with 40dB Dynamic Range
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