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LTC2445

更新时间： 2024-11-12 14:57:51
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
30页 341K
描述
具可选速度 / 分辨率的 24 位高速 8 / 16 通道 ΔΣ ADC

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中文翻译

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LTC2445 数据手册

 浏览型号LTC2445的Datasheet PDF文件第2页浏览型号LTC2445的Datasheet PDF文件第3页浏览型号LTC2445的Datasheet PDF文件第4页浏览型号LTC2445的Datasheet PDF文件第5页浏览型号LTC2445的Datasheet PDF文件第6页浏览型号LTC2445的Datasheet PDF文件第7页 
LTC2444/LTC2445/  
LTC2448/LTC2449  
24-Bit High Speed  
8-/16-Channel ∆∑ ADCs with  
Selectable Speed/Resolution  
DescripTion  
FeaTures  
The LTC®2444/LTC2445/LTC2448/LTC2449 are 8-/16-  
channel (4-/8-differential) high speed 24-bit No Latency  
n
Up to 8 Differential or 16 Single-Ended Input Channels  
n
Up to 8kHz Output Rate (External f )  
O
™
n
Up to 4kHz Multiplexing Rate (External f )  
∆Σ ADCs. They use a proprietary delta-sigma architec-  
O
n
Selectable Speed/Resolution  
ture enabling variable speed/resolution. Through a simple  
4-wireserialinterface, tenspeed/resolutioncombinations  
n
2µV  
Noise at 1.76kHz Output Rate  
RMS  
RMS  
n
n
200nV  
Noise at 13.8Hz Output Rate with  
6.9Hz/280nV  
to 3.5kHz/25µV  
(4kHz with external  
RMS  
RMS  
Simultaneous 50Hz/60Hz Rejection  
oscillator) can be selected with no latency between con-  
version results or shift in DC accuracy (offset, full-scale,  
linearity, drift). Additionally, a 2X speed mode can be  
selected enabling output rates up to 7kHz (8kHz if an  
external oscillator is used) with one cycle latency.  
Guaranteed Modulator Stability and Lock-Up  
Immunity for any Input and Reference Conditions  
0.0005% INL, No Missing Codes  
n
n
n
n
Autosleep Enables 20µA Operation at 6.9Hz  
<5µV Offset (4.5V < V < 5.5V, –40°C to 85°C)  
CC  
Any combination of single-ended or differential inputs  
can be selected with a common mode input range from  
Differential Input and Differential Reference with  
GND to V Common Mode Range  
CC  
ground to V , independent of V . While operating in  
CC  
REF  
n
No Latency Mode, Each Conversion is Accurate Even  
After a New Channel is Selected  
the 1X speed mode the first conversion following a new  
speed, resolution, or channel selection is valid. Since  
there is no settling time between conversions, all 8 dif-  
ferential channels can be scanned at a rate of 500Hz.  
At the conclusion of each conversion, the converter is  
internally reset eliminating any memory effects between  
successive conversions and assuring stability of the high  
order delta-sigma modulator.  
n
n
Internal Oscillator—No External Components  
LTC2445/LTC2449 Include MUXOUT/ADCIN for  
External Buffering or Gain  
n
Tiny QFN 5mm × 7mm Package  
applicaTions  
n
High Speed Multiplexing  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
No Latency ∆∑ and SoftSpan are trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners.  
n
Weight Scales  
n
Auto Ranging 6-Digit DVMs  
n
Direct Temperature Measurement  
n
High Speed Data Acquisition  
Typical applicaTion  
LTC2444/LTC2448  
RMS Noise vs Speed  
Simple 24-Bit Variable Speed Data Acquisition System  
100  
4.5V TO 5.5V  
V
V
V
= 5V  
CC  
= 5V  
IN  
REF  
+
–
= V = 0V  
1µF  
IN  
2X SPEED MODE  
+
REF  
V
CC  
NO LATENCY MODE  
CH0  
CH1  
= EXTERNAL OSCILLATOR  
10  
1
= INTERNAL OSCILLATOR  
F
O
2.8µV AT 880Hz  
(SIMULTANEOUS 50Hz/60Hz  
REJECTION AT 6.9Hz OUTPUT RATE)  
•
•
•
CH7  
CH8  
SDI  
SCK  
SDO  
CS  
280nV AT 6.9Hz  
(50/60Hz REJECTION)  
16-CHANNEL  
MUX  
VARIABLE SPEED/  
RESOLUTION  
+
–
4-WIRE  
SPI INTERFACE  
THERMOCOUPLE  
•
•
•
DIFFERENTIAL  
24-BIT ∆∑ ADC  
CH15  
COM  
0.1  
1
10  
100  
1000  
10000  
–
REF  
CONVERSION RATE (Hz)  
GND  
LTC2448  
2440 TA01b  
2444 TA01a  
2444589fc  
1
For more information www.linear.com/LTC2444  
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