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LTC2381CMS-16PBF

Description
16-Bit, 250ksps, Low Power SAR ADC with Serial Interface
File Size1MB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC2381CMS-16PBF Overview

16-Bit, 250ksps, Low Power SAR ADC with Serial Interface

LTC2381-16
16-Bit, 250ksps, Low Power
SAR ADC with Serial Interface
FEATURES
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DESCRIPTION
The LTC
®
2381-16 is a low noise, low power, high speed
16-bit successive approximation register (SAR) ADC.
Operating from a 2.5V supply, the LTC2381-16 has a
±2.5V fully differential input range. The LTC2381-16
consumes only 3.25mW and achieves ±2LSB INL max,
no missing codes at 16-bits and 92dB SNR.
The LTC2381-16 has a high speed SPI-compatible serial
interface that supports 1.8V, 2.5V, 3.3V and 5V logic
while also featuring a daisychain mode. The fast 250ksps
throughput with no cycle latency makes the LTC2381-16
ideally suited for a wide variety of high speed applica-
tions. An internal oscillator sets the conversion time,
easing external timing considerations. The LTC2381-16
automatically powers down between conversions, lead-
ing to reduced power dissipation that scales with the
sampling rate.
The LTC2381-16 features a proprietary sampling
architecture that enables the ADC to begin acquiring the
next sample during the current conversion. The resulting
extended acquisition time of 3.25μs allows the use of
extremely low power ADC drivers.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
250ksps Throughput Rate
±2LSB INL (Max)
Guaranteed 16-Bit No Missing Codes
Low Power: 3.25mW at 250ksps, 13μW at 1ksps
92dB SNR (typ) at f
IN
= 20kHz
Extended Acquisition Time of 3.25μs Allows Use of
Lower Power Drivers
Guaranteed Operation to 125°C
2.5V Supply
Fully Differential Input Range ±2.5V
External 2.5V Reference Input
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-pin 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
TYPICAL APPLICATION
2.5V
10μF
1.8V TO 5V
0.1μF
AMPLITUDE (dBFS)
ANALOG INPUT
0V TO 2.5V
50Ω
LT6350
50Ω
SINGLE-ENDED-
TO-DIFFERENTIAL
DRIVER
100Ω
3300pF
IN
100Ω
REF
2.5V
GND
IN
+
32k Point FFT f
S
= 250ksps, f
IN
= 20kHz
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
25
50
75
FREQUENCY (kHz)
100
125
SNR = 91.8dB
THD = –106dB
SINAD = 91.6dB
SFDR = 107dB
V
DD
LTC2381-16
OV
DD
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
238116 TA01
SAMPLE CLOCK
47μF
(X5R, 0805 SIZE)
238116 TA02a
238116f
1

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