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LTC2378IMS-18#PBF PDF预览

LTC2378IMS-18#PBF

更新时间： 2024-01-20 11:07:44
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LTC2378IMS-18#PBF 数据手册

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LTC2378-18  
18-Bit, 1Msps, Low Power  
SAR ADC with 102dB SNR  
FeaTures  
DescripTion  
The LTC®2378-18 is a low noise, low power, high speed  
18-bit successive approximation register (SAR) ADC. Op-  
n
1Msps Throughput Rate  
n
1ꢀ.75Sꢁ IN5 ꢂMaꢃx  
n
Guaranteed 18-ꢁit No Missing Codes  
erating from a 2.5V supply, the LTC2378-18 has a V  
fully differential input range with V ranging from 2.5V  
to 5.1V. The LTC2378-18 consumes only 13.5mW and  
achieves 1.75LSꢀ INL maximum, no missing codes at  
18 bits with 102dꢀ SNR.  
REF  
n
5ow Power: 13ꢀ7mW at 1Msps, 13ꢀ7µW at 1ksps  
REF  
n
102dꢁ SNR ꢂtypx at f = 2kHz  
IN  
IN  
n
–124dꢁ THD ꢂtypx at f = 2kHz  
n
Digital Gain Compression ꢂDGCx  
n
Guaranteed Operation to 125°C  
The LTC2378-18 has a high speed SPI-compatible serial  
interface that supports 1.8V, 2.5V, 3.3V and 5V logic while  
alsofeaturingadaisy-chainmode.Thefast1Mspsthrough-  
put with no cycle latency makes the LTC2378-18 ideally  
suited for a wide variety of high speed applications. An  
internaloscillatorsetstheconversiontime,easingexternal  
timingconsiderations.TheLTC2378-18automaticallypow-  
ers down between conversions, leading to reduced power  
dissipation that scales with the sampling rate.  
n
2.5V Supply  
n
Fully Differential Input Range V  
REF  
n
n
n
n
n
n
V
Input Range from 2.5V to 5.1V  
REF  
No Pipeline Delay, No Cycle Latency  
1.8V to 5V I/O Voltages  
SPI-Compatible Serial I/O with Daisy-Chain Mode  
Internal Conversion Clock  
16-Lead MSOP and 4mm × 3mm DFN Packages  
The LTC2378-18 features a unique digital gain compres-  
sion(DGC)function,whicheliminatesthedriveramplifier’s  
negative supply while preserving the full resolution of the  
ADC. When enabled, the ADC performs a digital scaling  
applicaTions  
n
Medical Imaging  
n
High Speed Data Acquisition  
n
Portable or Compact Instrumentation  
Industrial Process Control  
Low Power ꢀattery-Operated Instrumentation  
ATE  
function that maps zero-scale code from 0V to 0.1 • V  
REF  
n
and full-scale code from V  
to 0.9 • V . For a typical  
REF  
REF  
n
reference voltage of 5V, the full-scale input range is now  
0.5V to 4.5V, which provides adequate headroom for  
powering the driving amplifier from a single 5.5V supply.  
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners.  
Typical applicaTion  
32k Point FFT fS = 1Msps, fIN = 2kHz  
2.5V 1.8V TO 5V  
0
SNR = 102.3dB  
–20  
–40  
THD = –124dB  
SINAD = 102.2dB  
SFDR = 126dB  
10µF  
0.1µF  
V
OV  
DD  
CHAIN  
RDL/SDI  
SDO  
DD  
6800pF  
3300pF  
6800pF  
V
V
REF  
20Ω  
20Ω  
–60  
+
–
IN  
+
–
–80  
0V  
LTC2378-18  
SCK  
REF  
BUSY  
CNV  
REF/DGC  
–100  
–120  
–140  
–160  
–180  
IN  
SAMPLE CLOCK  
0V  
V
REF  
GND  
REF  
237818 TA01a  
2.5V TO 5.1V  
47µF  
(X5R, 0805 SIZE)  
0
100  
200  
300  
400  
500  
FREQUENCY (kHz)  
237818 TA01b  
237818fa  
1
For more information www.linear.com/LTC2378-18  
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