LTC2381-16 Datasheet, PDF (1/24 Pages) Linear Technology – 16-Bit, 250ksps, Low Power SAR ADC with Serial Interface

LTC2381-16
16-Bit, 250ksps, Low Power
SAR ADC with Serial Interface
FEATURES
n _{250ksps Throughput Rate}
n _{±2LSB INL (Max)}
n _{Guaranteed 16-Bit No Missing Codes}
n _{Low Power: 3.25mW at 250ksps, 13μW at 1ksps}
n _{92dB SNR (typ) at fIN = 20kHz}
n _{Extended Acquisition Time of 3.25μs Allows Use of}
Lower Power Drivers
n _{Guaranteed Operation to 125°C}
n _{2.5V Supply}
n _{Fully Differential Input Range ±2.5V}
n _{External 2.5V Reference Input}
n _{No Pipeline Delay, No Cycle Latency}
n _{1.8V to 5V I/O Voltages}
n _{SPI-Compatible Serial I/O with Daisy-Chain Mode}
n _{Internal Conversion Clock}
n _{16-pin MSOP and 4mm × 3mm DFN Packages}
APPLICATIONS
n _{Medical Imaging}
n _{High Speed Data Acquisition}
n _{Portable or Compact Instrumentation}
n _{Industrial Process Control}
n _{Low Power Battery-Operated Instrumentation}
n _ATE
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.
TYPICAL APPLICATION
ANALOG INPUT
0V TO 2.5V
50Ω
LT6350
50Ω
SINGLE-ENDED-
TO-DIFFERENTIAL
DRIVER
2.5V 1.8V TO 5V
10μF
0.1μF
100Ω
3300pF
100Ω
IN⁺
V_DD
OV_DD
LTC2381-16
IN^–
REF
GND
2.5V
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
238116 TA01
47μF
(X5R, 0805 SIZE)
SAMPLE CLOCK
32k Point FFT f_S = 250ksps, f_IN = 20kHz
0
SNR = 91.8dB
–20
THD = –106dB
SINAD = 91.6dB
–40
SFDR = 107dB
–60
–80
–100
–120
–140
–160
–180
0
25
50
75 100 125
FREQUENCY (kHz)
238116 TA02a
238116f
1