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LTC2498

更新时间： 2024-09-25 14:58:27
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
38页 1075K
描述
具 Easy Drive 输入电流抵消功能的 24 位、8 通道 / 16 通道 ΔΣ ADC

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中文翻译

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LTC2498 数据手册

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LTC2498  
24-Bit 8-/16-Channel ΔS  
ADC with Easy Drive Input  
Current Cancellation  
Description  
Features  
n
Up to 8 Differential or 16 Single-Ended Inputs  
The LTC®2498 is a 16-channel (8-differential) 24-bit No  
Latency ΔS™ ADC with Easy Drive technology. The pat-  
ented sampling scheme eliminates dynamic input current  
errors and the shortcomings of on-chip buffering through  
automatic cancellation of differential input current. This  
allows large external source impedances, and rail-to-rail  
input signals to be directly digitized while maintaining  
exceptional DC accuracy.  
n
Easy Drive™ Technology Enables Rail-to-Rail  
Inputs with Zero Differential Input Current  
n
Directly Digitizes High Impedance Sensors with  
Full Accuracy  
600nV RMS Noise  
n
n
Integrated High Accuracy Temperature Sensor  
n
GND to V Input/Reference Common Mode Range  
CC  
n
Programmable 50Hz, 60Hz or Simultaneous  
TheLTC2498includesahighaccuracytemperaturesensor  
and anintegratedoscillator. This device can be configured  
to measure an external signal (from combinations of 16  
analog input channels operating in single ended or dif-  
ferential modes) or its internal temperature sensor. The  
integrated temperature sensor offers 1/30th °C resolution  
and 2°C absolute accuracy.  
50Hz/60Hz Rejection Mode  
2ppm INL, No Missing Codes  
n
n
n
n
1ppm Offset and 15ppm Full-Scale Error  
2x Speed Mode (15Hz Using Internal Oscillator)  
No Latency: Digital Filter Settles in a Single Cycle,  
Even After a New Channel Is Selected  
Single Supply 2.7V to 5.5V Operation (0.8mW)  
Internal Oscillator  
n
n
n
The LTC2498 allows a wide common mode input range  
(0V to V ), independent of the reference voltage. Any  
Tiny QFN 5mm × 7mm Package  
CC  
combination of single-ended or differential inputs can be  
selected and the first conversion after a new channel is  
selected is valid. Access to the multiplexer output enables  
optionalexternalamplifierstobesharedbetweenallanalog  
inputs and auto calibration continuously removes their  
associated offset and drift.  
applications  
n
Direct Sensor Digitizer  
n
Direct Temperature Measurement  
Instrumentation  
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
No Latency ∆∑ and Easy Drive are trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners.  
n
Industrial Process Control  
typical application  
Internal Sensor  
Absolute Temperature Error  
5
4
3
Data Acquisition System with Temperature Compensation  
2.7V TO 5.5V  
CH0  
CH1  
MUXOUT/  
ADCIN  
V
0.1µF  
10µF  
CC  
2
1
•
+
REF  
•
•
+
SDI  
SCK  
SDO  
CS  
IN  
CH7  
16-CHANNEL  
MUX  
0
24-BIT ∆Σ ADC  
WITH EASY DRIVE  
4-WIRE  
SPI INTERFACE  
CH8  
–1  
–2  
–3  
–4  
–5  
•
–
•
IN  
•
–
REF  
CH15  
COM  
f
O
TEMPERATURE  
SENSOR  
MUXOUT/  
ADCIN  
OSC  
–55 –30 –5  
20  
45  
70  
95 120  
2498 TA01a  
TEMPERATURE (°C)  
2498 TA01b  
2498fg  
1
For more information www.linear.com/LTC2498  
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