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LTC2447

更新时间： 2023-12-20 18:44:01
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
30页 604K
描述
具可选多个基准输入的 24 位、高速、8 通道 ΔΣ ADC

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LTC2447 数据手册

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LTC2446/LTC2447  
24-Bit High Speed  
8-Channel ∆Σ ADCs with  
Selectable Multiple Reference Inputs  
DESCRIPTION  
FEATURES  
The LTC®2446/LTC2447 4-terminal switching enables  
multiplexed ratiometric measurements. Four sets of  
selectable differential inputs coupled with four sets of  
differential reference inputs allow multiple RTDs, bridges  
and other sensors to be digitized by a single converter.  
A fifth differential reference input can be selected for any  
input channel not requiring ratiometric measurements  
(thermocouples, voltages, current sense, etc.). The flex-  
ible input multiplexer allows single-ended or differential  
inputs coupled with a slaved reference input or a universal  
reference input.  
n
Five Selectable Differential Reference Inputs  
Four Differential/Eight Single-Ended Inputs  
4-Way MUX for Multiple Ratiometric  
Measurements  
n
n
n
n
n
Up to 8kHz Output Rate (External f )  
O
Up to 4kHz Multiplexing Rate (External f )  
O
Selectable Speed/Resolution:  
2µV  
Noise at 1.76kHz Output Rate  
RMS  
200nV  
Noise at 13.8Hz Output Rate with  
RMS  
Simultaneous 50/60Hz Rejection  
Guaranteed Modulator Stability and Lock-Up  
Immunity for any Input and Reference Conditions  
0.0005% INL, No Missing Codes  
n
n
n
n
n
A proprietary delta-sigma architecture results in absolute  
accuracy (offset, full-scale, linearity) of 15ppm, noise as  
Autosleep Enables 20µA Operation at 6.9Hz  
<5µV Offset (4.5V < V < 5.5V, –40°C to 85°C)  
CC  
low as 200nV  
and speedsas high as 8kHz. Through  
RMS  
Differential Input and Differential Reference with  
a simple 4-wire interface, ten speed/resolution combina-  
tions can be selected. The first conversion following a  
speed, resolution, channel change or reference change is  
valid since there is no settling time between conversions,  
enabling scan rates of up to 4kHz. Additionally, a 2× mode  
can be selected for any speed-enabling output rates up to  
8kHz with one cycle of latency.  
GND to V Common Mode Range  
CC  
n
No Latency Mode, Each Conversion is Accurate Even  
After a New Channel is Selected  
n
n
Internal Oscillator—No External Components  
LTC2447 Includes MUXOUT/ADCIN for External  
Buffering or Gain  
n
Tiny QFN 5mm × 7mm Package  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. patents, including 6140950, 6169506, 6208279, 6411242, 6639526.  
APPLICATIONS  
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Flow  
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Weight Scales  
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Pressure  
n
Direct Temperature Measurement  
n
Gas Chromatography  
TYPICAL APPLICATION  
LTC2446 RMS Noise vs Speed  
100  
Multiple Ratiometric Measurement System  
V
V
V
= 5V  
CC  
= 5V  
REF  
+
–
= V = 0V  
IN  
IN  
2× SPEED MODE  
NO LATENCY MODE  
V
CC  
LTC2446  
+
10  
1
REF  
2.8V AT 880Hz  
CS  
+
IN  
280nV AT 6.9Hz  
(50/60Hz REJECTION)  
+
–
•
•
•
19-INPUT  
4-OUTPUT  
MUX  
SDI  
SDO  
SCK  
VARIABLE SPEED/  
RESOLUTION 24-BIT  
–
∆Σ ADC  
IN  
–
REF  
0.1  
1
10  
100  
1000  
10000  
CONVERSION RATE (Hz)  
24467 TA01  
24467 TA02  
24467fb  
1
For more information www.linear.com/LTC2446  
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