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LTC6412

更新时间： 2024-11-21 05:44:03
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 752K
描述
800MHz, 31dB Range Analog-Controlled VGA

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中文翻译

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LTC6412 数据手册

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LTC6412  
800MHz, 31dB Range  
Analog-Controlled VGA  
FEATURES  
DESCRIPTION  
The LTC®6412 is a fully differential variable gain amplifier  
with linear-in-dB analog gain control. It is designed for  
AC-coupled operation in IF receiver chains from 1MHz  
to 500MHz. The part has a constant OIP3 across a wide  
output amplitude range and across the 31dB gain control  
range. The output noise (NF + Gain) is also flat versus gain  
to provide a uniform spurious-free dynamic range (SFDR)  
>120dB over the full gain control range at 240MHz.  
n
800MHz –3dB Small-Signal Bandwidth  
n
Continuously-Adjustable Gain Control  
n
–14dB to +17dB Linear-in-dB Gain Range  
n
35dBm OIP3 at 240MHz Across All Gain Settings  
n
10dB Noise Figure at Maximum Gain  
n
(IIP3 – NF) = +8dBm at 240MHz Across All Gains  
n
2.7nV/√Hz Input Referred Noise  
Differential Inputs and Outputs  
n
n
50Ω Input Impedance Across all Gains  
The LTC6412 is ideal for interfacing with the LT®5527 and  
LT5557 downconverting mixers, LTC6410-6 IF amplifier  
and the LTC6400/LTC6401/LTC6416 ADC drivers for use  
in 12-, 14-, and 16-bit ADC applications.  
n
Single Supply Operation from 3V to 3.6V  
n
110mA Supply Current  
n
4mm × 4mm × 0.75mm 24-Pin QFN Package  
APPLICATIONS  
TheLTC6412recoversquicklyfromanoverdrivecondition,  
and the EN pin allows for a fast output signal disable to  
protect sensitive downstream components. Asserting the  
SHDN pin reduces the current consumption below 1mA  
for power-down or sleep modes.  
n
IF Signal Chain Automatic Gain Control (AGC)  
n
2.5G and 3G Cellular Basestation Transceivers  
n
WiMAX, WiBro, WLAN Receivers  
n
Satellite and GPS Receiver IF  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
3.3V Fully Differential 240MHz IF Receiver Chain with 31dB Gain Control  
VGA Gain vs Frequency  
Over Gain Control Range  
3.3V  
20  
10  
3.3V  
G
MAX  
0.1μF  
1nF  
3.3V  
3.3V  
180nH  
180nH  
10nF  
IF INPUT  
10nF  
BPF  
V
DD  
LTC2208  
+OUT  
–OUT  
+IN  
–IN  
0
+OUT  
LTC6400-8  
+
+IN  
+
–
V
A
A
IN  
0.1μF  
0.1μF  
LTC6412  
V
CM  
–10  
–20  
–30  
–
IN  
–IN  
V
–OUT  
V
GND  
CM  
G
MIN  
GAIN CONTROL  
(+ SLOPE MODE)  
6412 TA01  
2.2μF  
0.1μF  
0.1μF  
10nF  
0.1μF  
1
10  
100  
1000  
10000  
FREQUENCY (MHz)  
6412 G01  
6412f  
1
1234567...24

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