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LTC2379CDE-18 参数 Datasheet PDF下载

LTC2379CDE-18图片预览
型号: LTC2379CDE-18
PDF下载: 下载PDF文件 查看货源
内容描述: LTC2379-1818位, 1.6Msps ,低功耗SAR型ADC的SNR 101.2分贝 [LTC2379-1818-Bit, 1.6Msps, Low Power SAR ADC with 101.2dB SNR]
分类和应用:
文件页数/大小: 26 页 / 492 K
品牌: LINEAR [ LINEAR INTEGRATED SYSTEMS ]
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FEATURES
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LTC2379-18
18-Bit, 1.6Msps, Low Power
SAR ADC with 101.2dB SNR
DESCRIPTION
The LTC
®
2379-18 is a low noise, low power, high speed
18-bit successive approximation register (SAR) ADC.
Operating from a 2.5V supply, the LTC2379-18 has a
±V
REF
fully differential input range with V
REF
ranging from
2.5V to 5.1V. The LTC2379-18 consumes only 18mW and
achieves ±2LSB INL maximum, no missing codes at 18 bits
with 101.2dB SNR.
The LTC2379-18 has a high speed SPI-compatible serial
interface that supports 1.8V, 2.5V, 3.3V and 5V logic while
also featuring a daisy-chain mode. The fast 1.6Msps
throughput with no cycle latency makes the LTC2379-18
ideally suited for a wide variety of high speed applications.
An internal oscillator sets the conversion time, easing exter-
nal timing considerations. The LTC2379-18 automatically
powers down between conversions, leading to reduced
power dissipation that scales with the sampling rate.
The LTC2379-18 features a unique digital gain compres-
sion (DGC) function, which eliminates the driver amplifier’s
negative supply while preserving the full resolution of the
ADC. When enabled, the ADC performs a digital scaling
function that maps zero-scale code from 0V to 0.1 • V
REF
and full-scale code from V
REF
to 0.9 • V
REF
. For a typical
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.
1.6Msps Throughput Rate
±2LSB INL (Max)
Guaranteed 18-Bit No Missing Codes
Low Power: 18mW at 1.6Msps, 18μW at 1.6ksps
101.2dB SNR (typ) at f
IN
= 2kHz
–120dB
THD (typ) at f
IN
= 2kHz
Digital Gain Compression (DGC)
Guaranteed Operation to 125°C
2.5V Supply
Fully Differential Input Range ±V
REF
V
REF
Input Range from 2.5V to 5.1V
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
APPLICATIONS
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Medical Imaging
High Speed Data Acquisition
Portable or Compact Instrumentation
Industrial Process Control
Low Power Battery-Operated Instrumentation
ATE
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.
Protected by U.S. Patents including 7705765.
TYPICAL APPLICATION
32k Point FFT f
S
= 1.6Msps, f
IN
= 2kHz
2.5V
10μF
V
DD
IN
+
3300pF
LTC2379-18
IN
20Ω
3300pF
REF
2.5V TO 5.1V
47μF
(X5R, 0805 SIZE)
GND
OV
DD
1.8V TO 5V
0.1μF
AMPLITUDE (dBFS)
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
REF/DGC
237918 TA01
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
SNR = 101.2dB
THD = –120dB
SINAD = 101.1dB
SFDR = 121dB
V
REF
0V
V
REF
0V
+
20Ω
3300pF
SAMPLE CLOCK
V
REF
100 200 300 400 500 600 700 800
FREQUENCY (kHz)
237918 TA02
237918fa
1