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LTC2435_15

更新时间： 2024-11-14 01:19:03
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
42页 645K
描述
20-Bit No Latency ADCs with Differential Input and Differential Reference

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LTC2435_15 数据手册

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LTC2435/LTC2435-1  
20-Bit No Latency ∆∑  
™
ADCs with Differential Input and  
Differential Reference  
DescripTion  
FeaTures  
The LTC®2435/LTC2435-1 are 2.7V to 5.5V micropower  
20-bit differential ∆∑ analog to digital converters with  
integrated oscillator, 3ppm INL and 0.8ppm RMS noise.  
They use delta-sigma technology and provide single  
cycle 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%, or it can be driven by an external oscillator  
for a user defined rejection frequency. The LTC2435-1  
can be configured for better than 87dB input differential  
mode rejection over the range of 49Hz to 61.2Hz (50Hz  
and 60Hz 2% simultaneously). The internal oscillator  
requires no external frequency setting components.  
n
2× Speed Up Version of the LTC2430: 15Hz Output  
Rate, 60Hz Notch—LTC2435; 13.75Hz Output Rate,  
Simultaneous 50Hz/60Hz Notch—LTC2435-1  
n
Differential Input and Differential Reference with  
GND to V Common Mode Range  
CC  
n
n
n
n
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)  
n
n
n
n
The converters accept any external differential reference  
voltage from 0.1V to V for flexible ratiometric and re-  
CC  
mote sensing measurementconfigurations. The full-scale  
applicaTions  
differential input range is from –0.5V to 0.5V . The  
REF  
REFCM  
REF  
n
Direct Sensor Digitizer  
reference common mode voltage, V  
, and the input  
n
Weight Scales  
common mode voltage, V  
, may be independently set  
anywhere within the GND to V range of the LTC2435/  
INCM  
n
Direct Temperature Measurement  
Gas Analyzers  
Strain Gage Transducers  
Instrumentation  
Data Acquisition  
Industrial Process Control  
6-Digit DVMs  
CC  
n
LTC2435-1. The DC common mode input rejection is  
better than 120dB.  
n
n
The LTC2435/LTC2435-1 communicate through a flexible  
3-wire digital interface which is compatible with SPI and  
MICROWIRE™ protocols.  
n
n
n
L, LT, LTC and LTM are registered trademarks and C-Load and No Latency ∆∑ are trademarks  
of Linear Technology Corporation. Protected by U.S. Patents including 6140950, 6169506.  
Typical applicaTions  
Integral Nonlinearity vs Input  
10  
8
2.7V TO 5.5V  
V
CC  
1μF  
= INTERNAL OSC/50Hz REJECTION (LTC2435)  
= EXTERNAL CLOCK SOURCE  
= INTERNAL OSC/60Hz REJECTION (LTC2435)  
= INTERNAL 50Hz/60Hz REJECTION (LTC2435-1)  
6
4
2
14  
V
F
CC  
LTC2435/  
O
T
T
= 25°C  
A
2
LTC2435-1  
T
= 85°C  
A
3
4
+
13  
REFERENCE  
VOLTAGE  
0
REF  
REF  
SCK  
–
–2  
–4  
–6  
–8  
–10  
0.1V TO V  
= –45°C  
CC  
A
3-WIRE  
SPI INTERFACE  
5
6
12  
11  
+
ANALOG INPUT RANGE  
IN  
SDO  
F
= GND  
= 5V  
O
CC  
–0.5V  
TO 0.5V  
REF  
REF  
V
V
V
–
IN  
CS  
= 5V  
REF  
1, 7, 8, 9, 10, 15, 16  
GND  
= V  
= 2.5V  
–0.5  
INCM  
INCM  
2435 TA01  
–2.5  
–1.5  
0.5  
1.5  
2.5  
INPUT VOLTAGE (V)  
2435 TA01b  
24351fc  
1
For more information www.linear.com/LTC2435  
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