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LTC6421-20 PDF预览

LTC6421-20

更新时间： 2024-11-21 05:44:03
品牌 Logo 应用领域
凌特 - Linear 驱动器放大器功率放大器
页数 文件大小 规格书
16页 259K
描述
Dual Matched 1.3GHz Differential Amplifi ers/ADC Drivers

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LTC6421-20 数据手册

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LTC6421-20  
Dual Matched  
1.3GHz Differential  
Amplifiers/ADC Drivers  
FEATURES  
DESCRIPTION  
TheLTC®6421-20isadualhighspeeddifferentialamplifier  
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.  
n
Matched Gain 0.1dB  
n
Matched Phase 0.2° at 100MHz  
n
Channel Separation 80dB at 100MHz  
n
1.3GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB)  
n
IMD = –76dBc at 100MHz, 2V  
3
P-P  
n
n
n
n
n
n
n
Equivalent OIP = 42dBm at 100MHz  
3
The LTC6421-20 is easy to use, with minimal support  
circuitry required. The output common mode voltage  
is set using an external pin, independent of the inputs,  
whicheliminatestheneedfortransformersorAC-coupling  
capacitors in many applications. The gain is internally  
fixed at 20dB (10V/V).  
1nV/√Hz Internal Op Amp Noise  
6.2dB Noise Figure  
Differential Inputs and Outputs  
Rail-to-Rail Output Swing  
40mA Supply Current (120mW) per Amplifier  
1V to 1.6V Output Common Mode Voltage,  
Adjustable  
DC- or AC-Coupled Operation  
20-Lead 3mm × 4mm × 0.75mm QFN Package  
The LTC6421-20 saves space and power compared to  
alternativesolutionsusingIFgainblocksandtransformers.  
The LTC6421-20 is packaged in a compact 20-lead  
3mm × 4mm QFN package and operates over the –40°C  
to 85°C temperature range.  
n
n
APPLICATIONS  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
Differential ADC Driver  
n
Differential Driver/Receiver  
n
Single Ended to Differential Conversion  
IF Sampling (Diversity) Receivers  
n
TYPICAL APPLICATION  
Matched Dual Amplifiers with Output Common Mode Biasing  
3V  
1000pF 0.1μF  
V
V
OCMA  
OCMA  
Distribution of Gain Match  
+
V
A
ENABLEA  
Z
IN  
= 200Ω  
0.1μF  
LTC6421-20  
40  
35  
30  
25  
20  
15  
10  
5
1000Ω  
100Ω  
100Ω  
12.5Ω  
12.5Ω  
–INA  
+OUTA  
–OUTA  
V
V
OCMA  
OCMA  
V
INA  
0.1μF  
+INA  
–
–
1000Ω  
1000Ω  
V
V
0.1dB GAIN MATCHING  
0.1° PHASE MATCHING  
AT 100MHz  
0.1μF  
0.1μF  
100Ω  
100Ω  
12.5Ω  
12.5Ω  
+INB  
–INB  
–OUTB  
+OUTB  
V
V
OCMB  
OCMB  
V
INB  
0
–0.25 –0.15 –0.05  
0.05  
0.15  
0.25  
CHANNEL-TO-CHANNEL GAIN MATCH (dB)  
1000Ω  
Z
= 200Ω  
IN  
642120 TA01b  
+
V
B
V
OCMB  
ENABLEB  
642120 TA01a  
1000pF  
0.1μF  
V
OCMB  
3V  
642120fa  
1
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