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LTC2430

更新时间： 2024-11-14 14:57:47
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
40页 454K
描述
具差分输入和差分基准的 20 位、No Latency ?Σ? ADC

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中文翻译

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LTC2430 数据手册

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LTC2430/LTC2431  
20-Bit No Latency ∆ΣTM ADCs  
with Differential Input and  
Differential Reference  
U
FEATURES  
DESCRIPTIO  
■
Low Supply Current (200µA in Conversion Mode  
The LTC®2430/LTC2431 are 2.7V to 5.5V micropower  
20-bit differential ∆Σ analog-to-digital converters with an  
integrated oscillator, 3ppm INL and 0.56ppm RMS noise.  
Theyusedelta-sigmatechnologyandprovidesinglecycle  
settling time for multiplexed applications. Through a  
single pin, the LTC2430/LTC2431 can be configured for  
better than 110dB differential mode rejection at 50Hz or  
60Hz ±2%, or they can be driven by an external oscillator  
for a user-defined rejection frequency. The internal oscil-  
lator requires no external frequency setting components.  
and 4µA in Autosleep Mode)  
■
Differential Input and Differential Reference  
with GND to VCC Common Mode Range  
■
3ppm INL, No Missing Codes  
■
10ppm Full-Scale Error and 1ppm Offset  
■
0.56ppm Noise, 20.8 ENOBs  
■
No Latency: Digital Filter Settles in a Single Cycle.  
Each Conversion Is Accurate, Even After an  
Input Step  
■
Single Supply 2.7V to 5.5V Operation  
The converters accept any external differential reference  
voltage from 0.1V to VCC for flexible ratiometric and  
remote sensing measurement configurations. The full-  
■
Internal Oscillator—No External Components  
Required  
110dB Min, 50Hz/60Hz Notch Filter  
■
scale differential input range is from –0.5VREF to 0.5VREF  
.
■
Pin Compatible with 24-Bit LTC2410/LTC2411  
The reference common mode voltage, VREFCM, and the  
input common mode voltage, VINCM, may be indepen-  
dently set anywhere within GND to VCC. The DC common  
mode input rejection is better than 120dB.  
U
APPLICATIO S  
■
Direct Sensor Digitizer  
■
Weight Scales  
The LTC2430/LTC2431 communicate through a flexible  
3-wire digital interface that is compatible with SPI and  
MICROWIRETM protocols.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
No Latency ∆Σ is a trademark of Linear Technology Corporation.  
MICROWIRE is a trademark of National Semiconductor Corporation.  
■
Direct Temperature Measurement  
Gas Analyzers  
Strain Gauge Transducers  
Instrumentation  
Data Acquisition  
Industrial Process Control  
DVMs and Meters  
■
■
■
■
■
■
U
TYPICAL APPLICATIO S  
Total Unadjusted Error  
(VCC = 5V, VREF = 5V)  
(V  
+ 0.25V) TO 20V  
OUT  
5
V
V
V
V
= 5V  
6
4
OUT  
CC  
LT1790  
3V TO 5V  
4
3
= 5V  
REF  
INCM  
= V  
= 2.5V  
INCM  
0.1µF  
1
2
F
= GND  
O
4.7µF  
2
V
25°C 85°C  
CC  
= INTERNAL OSC/50Hz REJECTION  
1
= EXTERNAL CLOCK SOURCE  
V
F
O
CC  
0
= INTERNAL OSC/60Hz REJECTION  
0.1µF  
LTC2431  
–1  
–2  
–3  
–4  
–5  
+
REF  
–45°C  
SCK  
–
REF  
3-WIRE  
SPI INTERFACE  
+
ANALOG INPUT RANGE  
IN  
SDO  
CS  
–0.5V  
TO 0.5V  
REF  
REF  
–
IN  
–2.5 –2 –1.5 –1 –0.5  
0
0.5  
1
1.5  
2
2.5  
GND  
24301 TA01  
INPUT VOLTAGE (V)  
24301 G01  
24301f  
1
1234567...40

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