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LTC2440_15

更新时间： 2024-11-14 01:17:31
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 367K
描述
24-Bit High Speed Differential ADC with Selectable Speed/Resolution

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中文翻译

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LTC2440_15 数据手册

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LTC2440  
24-Bit High Speed  
Differential Δ∑ ADC with  
Selectable Speed/Resolution  
DESCRIPTION  
FEATURES  
The LTC®2440 is a high speed 24-bit No Latency Δ∑TM  
ADC with 5ppm INL and 5μV offset. It uses proprietary  
delta-sigmaarchitectureenablingvariablespeedandreso-  
lution with no latency. Ten speed/resolution combinations  
n
Up to 3.5kHz Output Rate  
n
Selectable Speed/Resolution  
n
2μV  
Noise at 880Hz Output Rate  
RMS  
RMS  
200nV  
n
Noise at 6.9Hz Output Rate with  
Simultaneous 50/60Hz Rejection  
0.0005% INL, No Missing Codes  
(6.9Hz/200nV  
to 3.5kHz/25μV ) are programmed  
RMS  
RMS  
n
n
n
n
through a simple serial interface. Alternatively, by tying a  
singlepinHIGHorLOW,afast(880Hz/2μV )orultralow  
Autosleep Enables 20μA Operation at 6.9Hz  
RMS  
<5μV Offset (4.5V < V < 5.5V, –40°C to 85°C)  
noise (6.9Hz, 200nV  
, 50/60Hz rejection) speed/reso-  
CC  
RMS  
Differential Input and Differential Reference with  
lution combination can be easily selected. The accuracy  
(offset, full-scale, linearity, drift) and power dissipation  
are independent of the speed selected. Since there is no  
latency, a speed/resolution change may be made between  
conversions with no degradation in performance.  
GND to V Common Mode Range  
CC  
n
No Latency, Each Conversion is Accurate Even After  
an Input Step  
n
n
n
Internal Oscillator—No External Components  
Pin Compatible with the LTC2410  
24-Bit ADC in Narrow 16-Lead SSOP Package  
Following each conversion cycle, the LTC2440 automati-  
cally enters a low power sleep state. Power dissipation  
may be reduced by increasing the duration of this sleep  
state.Forexample,runningatthe3.5kHzconversionspeed  
but reading data at a 100Hz rate draws 240μA average  
current (1.1mW) while reading data at a 7Hz output rate  
draws only 25μA (125μW).The LTC2440 communicates  
through a flexible 3-wire or 4-wire digital interface that is  
compatible with the LTC2410 and is available in a narrow  
16-lead SSOP package.  
APPLICATIONS  
n
High Speed Multiplexing  
n
Weight Scales  
n
Auto Ranging 6-Digit DVMs  
n
Direct Temperature Measurement  
n
High Speed Data Acquisition  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
No Latency Δ∑ is a trademark of Linear Technology Corporation. All other trademarks are  
the property of their respective owners.  
TYPICAL APPLICATION  
Speed vs RMS Noise  
100  
Simple 24-Bit 2-Speed Acquisition System  
V
V
V
= 5V  
CC  
= 5V  
IN  
REF  
+
–
4.5V TO 5.5V  
= V = 0V  
IN  
10  
1
V
BUSY  
CC  
LTC2440  
2μV AT 880Hz  
+
f
REF  
O
REFERENCE VOLTAGE  
0.1V TO V  
4
–
CC  
200nV AT 6.9Hz  
(50/60Hz REJECTION)  
REF  
SCK  
SDO  
CS  
V
CC  
3-WIRE  
SPI INTERFACE  
+
IN  
ANALOG INPUT  
–0.5V TO 0.5V  
6.9Hz, 200nV NOISE,  
50/60Hz REJECTION  
–
REF  
REF  
IN  
10-SPEED SERIAL  
PROGRAMMABLE  
SDI  
0.1  
EXT  
GND  
880Hz OUTPUT RATE,  
2μV NOISE  
1
10  
100  
1000  
10000  
CONVERSION RATE (Hz)  
2440 TA01  
2440 TA01  
2440 TA02  
2440fd  
1
1234567...28

中文翻译

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