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LT1994

更新时间： 2024-11-05 14:58:15
品牌 Logo 应用领域
亚德诺 - ADI 放大器驱动驱动器
页数 文件大小 规格书
20页 226K
描述
低噪声、低失真全差分输入/输出放大器/驱动器

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中文翻译

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LT1994 数据手册

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LT1994  
Low Noise, Low Distortion  
Fully Differential Input/  
Output Amplifier/Driver  
FEATURES  
DESCRIPTION  
TheLT®1994isahighprecision,verylownoise,lowdistor-  
tion, fully differential input/output amplifier optimized for  
3V,single-supplyoperation.TheLT1994’soutputcommon  
mode voltage is independent of the input common mode  
voltage, and is adjustable by applying a voltage on the  
n
Fully Differential Input and Output  
n
Wide Supply Range: 2.375V to 12.6V  
n
Rail-to-Rail Output Swing  
Low Noise: 3nV/√Hz  
n
n
Low Distortion, 2V , 1MHz: –94dBc  
P-P  
n
n
n
n
n
n
n
n
n
Adjustable Output Common Mode Voltage  
V
pin. A separate internal common mode feedback  
OCM  
Unity-Gain Stable  
pathprovidesaccurateoutputphasebalancingandreduced  
even-order harmonics. This makes the LT1994 ideal for  
level shifting ground referenced signals for driving dif-  
ferential input, single-supply ADCs.  
Gain-Bandwidth: 70MHz  
Slew Rate: 65V/ꢀs  
Large Output Current: 85mA  
DC Voltage Offset <2mV Max  
Open-Loop Gain: 100V/mV  
Low Power Shutdown  
The LT1994 output can swing rail-to-rail and is capable  
of sourcing and sinking up to 85mA. In addition to the  
low distortion characteristics, the LT1994 has a low input  
referred voltage noise of 3nV/√Hz. This part maintains  
its performance for supply voltages as low as 2.375V. It  
draws only 13.3mA of supply current and has a hardware  
shutdown feature that reduces current consumption to  
225μA.  
8-Pin MSOP or 3mm × 3mm DFN Package  
APPLICATIONS  
n
Differential Input A/D Converter Driver  
n
Single-Ended to Differential Conversion  
n
Differential Amplification with Common Mode  
The LT1994 is available in an 8-pin MSOP or 8-pin DFN  
package.  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Translation  
n
Rail-to-Rail Differential Line Driver/Receiver  
n
Low Voltage, Low Noise, Differential Signal  
Processing  
TYPICAL APPLICATION  
LT1994 Driving an LTC1403A-1 1MHz  
Sine Wave, 8192 Point FFT Plot  
A/D Preamplifier: Single-Ended Input to Differential Output  
with Common Mode Level Shifting  
0
f
f
= 2.8Msps  
SAMPLE  
IN  
–10  
–20  
= 1.001MHz  
499Ω  
499Ω  
INPUT = 2V  
,
3V  
P-P  
10μF  
SINGLE ENDED  
SFDR = 93dB  
3V  
–30  
V
P-P  
IN  
0.1μF  
2V  
–40  
–50  
V
SD0  
24.9Ω  
24.9Ω  
DD  
+
–60  
– +  
A
IN  
CONV  
SCK  
–70  
V
LT1994  
47pF  
LTC1403A-1  
–
OCM  
50.4MHz  
–80  
0.1μF  
+ –  
A
IN  
–90  
V
GND  
REF  
–100  
–110  
–120  
10μF  
1994 TA01  
V
= 1.5V  
OCM  
499Ω  
499Ω  
0
0.35  
0.70  
1.05  
1.40  
FREQUENCY (MHz)  
1994 TA01b  
1994fb  
1
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