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LT1994

更新时间： 2024-11-29 04:19:39
品牌 Logo 应用领域
凌特 - Linear 驱动器
页数 文件大小 规格书
16页 221K
描述
1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF

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LT1994 数据手册

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LTC6401-20  
1.3GHz Low Noise, Low  
Distortion Differential ADC  
Driver for 140MHz IF  
FEATURES  
DESCRIPTION  
The LTC®6401-20 is a high-speed differential amplifier  
targeted at processing signals from DC to 140MHz. The  
part has been specifically designed to drive 12-, 14- and  
16-bitADCswithlownoiseandlowdistortion,butcanalso  
be used as a general-purpose broadband gain block.  
■
1.3GHz –3dB Bandwidth  
■
Fixed Gain of 10V/V (20dB)  
■
–93dBc IMD at 70MHz (Equivalent OIP = 50.5dBm)  
3
3
■
■
■
■
■
■
■
■
■
–74dBc IMD at 140MHz (Equivalent OIP = 41dBm)  
3
3
1nV/√Hz Internal Op Amp Noise  
2.1nV/√Hz Total Input Noise  
6.2dB Noise Figure  
Differential Inputs and Outputs  
200Ω Input Impedance  
2.85V to 3.5V Supply Voltage  
50mA Supply Current (150mW)  
1V to 1.6V Output Common Mode Voltage,  
Adjustable  
DC- or AC-Coupled Operation  
The LTC6401-20 is easy to use, with minimal support  
circuitry required. The output common mode voltage is  
set using an external pin, independent of the inputs, which  
eliminates the need for transformers or AC-coupling ca-  
pacitors in many applications. The gain is internally fixed  
at 20dB (10V/V).  
The LTC6401-20 saves space and power compared to  
alternative solutions using IF gain blocks and transform-  
ers. The LTC6401-20 is packaged in a compact 16-lead  
3mm × 3mm QFN package and operates over the –40°C  
to 85°C temperature range.  
■
■
■
Max Differential Output Swing 4.4V  
P-P  
Small 16-Lead 3mm × 3mm × 0.75mm QFN Package  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
APPLICATIONS  
■
Differential ADC Driver  
■
Differential Driver/Receiver  
■
Single Ended to Differential Conversion  
IF Sampling Receivers  
■
■
SAW Filter Interfacing  
TYPICAL APPLICATION  
Single-Ended to Differential ADC Driver  
Equivalent Output IP3 vs Frequency  
70  
(NOTE 7)  
3.3V  
1.25V  
60  
0.1μF + 1000pF  
0.1μF  
3.3V  
50  
+
V
0.1μF  
0.1μF  
V
OCM  
40  
10Ω  
10Ω  
V
V
DD  
CM  
+
–
INPUT  
66.5Ω  
+IN  
+OUT  
+OUTF  
AIN  
AIN  
30  
20  
10  
0
LTC6401-20  
LTC2208  
–OUTF  
–OUT  
–IN  
ENABLE  
–
V
29Ω  
LTC2208 130Msps  
16-Bit ADC  
20dB GAIN  
640120 TA01a  
0
50  
100  
150  
200  
FREQUENCY (MHz)  
640120 TA01b  
640120f  
1
1234567...16

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