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LTC2435-1

更新时间： 2024-11-12 22:55:51
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凌特 - Linear /
页数 文件大小 规格书
40页 463K
描述
20-Bit No Latency ADCs with Differential Input and Differential Reference

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LTC2435-1 数据手册

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LTC2435/LTC2435-1  
20-Bit No Latency ∆ΣTM  
ADCs with Differential Input and  
Differential Reference  
U
DESCRIPTIO  
FEATURES  
The LTC®2435/2435-1 are 2.7V to 5.5V micropower  
20-bit differential ∆Σ analog to digital converters with  
integrated oscillator, 3ppm INL and 0.8ppm RMS noise.  
Theyusedelta-sigmatechnologyandprovidesinglecycle  
settling time for multiplexed applications. Through a  
single pin, the LTC2435 can be configured for better than  
110dB input differential mode rejection at 50Hz or 60Hz  
±2%, oritcanbedrivenbyanexternaloscillatorforauser  
defined rejection frequency. The LTC2435-1 can be con-  
figured for better than 87dB input differential mode rejec-  
tion over the range of 49Hz to 61.2Hz (50Hz and 60Hz  
±2% simultaneously). The internal oscillator requires no  
external frequency setting components.  
■
2× Speed Up Version of the LTC2430: 15Hz Output  
Rate, 60Hz Notch—LTC2435; 13.75Hz Output Rate,  
Simultaneous 50Hz/60Hz Notch—LTC2435-1  
Differential Input and Differential Reference with  
GND to VCC Common Mode Range  
3ppm INL, No Missing Codes  
■
■
■
■
■
10ppm Gain Error  
0.8ppm Noise  
Single Conversion Settling Time for Multiplexed  
Applications  
Internal Oscillator—No External Components  
Required  
Single Supply 2.7V to 5.5V Operation  
Low Supply Current (200µA,4µA in Auto Sleep)  
20-Bit ADC in Narrow SSOP-16 Package  
(SO-8 Footprint)  
■
■
■
■
The converters accept any external differential reference  
voltage from 0.1V to VCC for flexible ratiometric and  
remote sensing measurement configurations. The full-  
scale differential input range is from –0.5VREF to 0.5VREF  
.
U
The reference common mode voltage, VREFCM, and the  
input common mode voltage, VINCM, may be indepen-  
dently set anywhere within the GND to VCC range of the  
LTC2435/LTC2435-1. The DC common mode input rejec-  
tion is better than 120dB.  
APPLICATIO S  
■
Direct Sensor Digitizer  
■
Weight Scales  
■
Direct Temperature Measurement  
Gas Analyzers  
Strain Gage Transducers  
Instrumentation  
Data Acquisition  
Industrial Process Control  
6-Digit DVMs  
■
The LTC2435/LTC2435-1 communicate through a flexible  
3-wire digital interface which 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.  
Protected by U.S. Patents including 6140950, 6169506.  
■
■
■
■
■
U
Integral Nonlinearity vs Input  
TYPICAL APPLICATIO S  
10  
8
6
2.7V TO 5.5V  
V
CC  
1µF  
4
2
= INTERNAL OSC/50Hz REJECTION (LTC2435)  
2
14  
T
T
= 25°C  
= EXTERNAL CLOCK SOURCE  
= INTERNAL OSC/60Hz REJECTION (LTC2435)  
= INTERNAL 50Hz/60Hz REJECTION (LTC2435-1)  
A
V
F
CC  
LTC2435/  
O
T
= 85°C  
A
0
LTC2435-1  
–2  
–4  
–6  
–8  
–10  
3
4
= –45°C  
+
A
13  
REFERENCE  
VOLTAGE  
REF  
REF  
SCK  
–
0.1V TO V  
F
= GND  
CC  
O
3-WIRE  
SPI INTERFACE  
V
V
V
= 5V  
CC  
REF  
INCM  
5
6
12  
11  
+
ANALOG INPUT RANGE  
= 5V  
= V  
IN  
SDO  
CS  
–0.5V  
TO 0.5V  
= 2.5V  
–0.5  
REF  
REF  
INCM  
–
IN  
1, 7, 8, 9, 10, 15, 16  
–2.5  
–1.5  
0.5  
1.5  
2.5  
GND  
2435 TA01  
INPUT VOLTAGE (V)  
2435 G04  
24351fa  
1
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