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LT1997-2

更新时间： 2024-11-05 14:58:15
品牌 Logo 应用领域
亚德诺 - ADI 放大器
页数 文件大小 规格书
26页 2777K
描述
精准、宽电压范围、增益可选放大器

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LT1997-2 数据手册

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LT1997-2  
Precision, Wide Voltage  
Range, Gain Selectable  
Funnel Amplifier  
FEATURES  
DESCRIPTION  
TheLT®1997-2isanattenuating(funnel)differenceampli-  
fierthatcanbeusedtotranslatelargedifferentialsignalsto  
the low voltage range compatible with ADCs. It combines  
a precision operational amplifier with highly-matched re-  
sistors to form a one-chip solution to attenuate and level  
shift voltages accurately using no external components.  
It comes with three standard pin-selectable gain options  
(0.1, 0.2 and 0.25), which can be further combined to  
form gains from 0.0455 to 0.55 (attenuations of 1.82 to  
22)withaccuracyof0.006%(60ppm). TheLT1997-2also  
works across a very wide input common-mode voltage  
range ( 255ꢀ), enabling robust operation in demanding  
industrial environments. Its excellent resistor matching  
results in a common mode rejection ratio of greater than  
105dB.  
n
Precision Attenuation: Gain = 0.1, 0.2, 0.25  
n
255ꢀ Common Mode ꢀoltage Range  
n
105dB Minimum CMRR (Gain = 0.1)  
n
0.006% (60ppm) Maximum Gain Error  
n
1ppm/°C Maximum Gain Error Drift  
n
2ppm Maximum Gain Nonlinearity  
n
Wide Supply ꢀoltage Range: 3.3ꢀ to 50ꢀ  
n
Rail-to-Rail Output  
350µA Supply Current  
n
n
80µꢀ Maximum Op Amp Offset ꢀoltage  
n
1MHz –3dB Bandwidth (Gain = 0.1)  
n
Low Power Shutdown: 20µA  
n
Space-Saving MSOP and DFN Packages  
APPLICATIONS  
The resistors maintain their excellent matching over  
temperature; the matching temperature coefficient is  
guaranteedlessthan1ppm/°C.Theresistorsareextremely  
linear with voltage, resulting in a gain nonlinearity of less  
than 2ppm.  
n
High ꢀoltage to Low ꢀoltage Level Translation  
n
ADC Driver  
n
Bidirectional Wide Common Mode Range ꢀoltage  
and Current Sensing  
n
Industrial Data-Acquisition Front-Ends  
n
The LT1997-2 is fully specified at 5ꢀ and 15ꢀ supplies  
and from –40°C to 125°C. The device is available in space  
saving 16-lead MSOP and 4mm × 4mm DFN14 packages.  
Replacement for Isolation Circuits  
n
Differential to Single-Ended Conversion  
All registered trademarks and trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
Interfacing a 20VP-P Ground-Referenced Input Signal to a 5V ADC  
LT1997-2 Driving LTC2364-16,  
+10V  
ADC, fIN = 1kHz, 32768-Point FFT  
5V  
0
ꢀ
ꢀ
ꢀ ꢁꢂ  
ꢀ
ꢀꢁꢂ  
+
LT1997-2  
–10V  
–INA –INB –INC  
V
ꢀ ꢁꢂ  
ꢃꢄꢃ  
ꢀꢁ0  
ꢀꢁ0  
ꢀꢁꢂ ꢃ ꢄꢅ0ꢆꢇꢈꢉꢊꢋ  
ꢀꢁꢂ ꢃ ꢄꢅ0ꢆꢇꢆꢈꢉꢊ  
ꢀꢁꢂR ꢃ ꢄ0ꢅꢆꢇꢈꢉ  
ꢀꢁꢂ ꢃ ꢄꢅ0ꢅꢆꢇ  
100k  
125k  
25k  
4.5V  
0.5V  
2.5V 1.8V TO 5V  
ꢀꢁR ꢂ ꢃꢄꢅꢆꢇꢈ  
ꢀꢁ0  
250k  
250k  
–
+
ꢀꢁꢂꢃꢄ ꢅ ꢆꢇꢈꢉꢊꢋ  
V
DD  
0V  
DD  
200Ω  
8nF  
OUT  
+
–
ꢀꢁ0  
IN  
LTC2364-16  
ꢀꢁ00  
ꢀꢁꢂ0  
ꢀꢁꢂ0  
125k  
100k  
50k  
50k  
REF2  
REF1  
IN  
REF  
GND  
5V  
OUT  
0
ꢀꢁ  
ꢀ0  
ꢀꢁ  
ꢀ00  
ꢀꢁꢂ  
–
SHDN V  
47µF  
+INA +INB +INC  
5.5V TO 40V  
IN  
ꢀRꢁꢂꢃꢁꢄꢅꢆ ꢇꢈꢉꢊꢋ  
LT6657-5  
GND  
ꢀꢁꢁꢂꢃ ꢄꢅ0ꢀꢆ  
19972 TA01a  
Rev 0  
1
Document Feedback  
For more information www.analog.com  
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