LTC2369-18 Datasheet, PDF (1/24 Pages) Linear Technology – 18-Bit, 1.6Msps, Pseudo-Differential Unipolar SAR

FEATURES
n _{1.6Msps Throughput Rate}
n _{±2.5LSB INL (Max)}
n _{Guaranteed 18-Bit No Missing Codes}
n _{Low Power: 18mW at 1.6Msps, 18μW at 1.6ksps}
n _{96.5dB SNR (Typ) at fIN = 2kHz}
n _{–120dB THD (Typ) at fIN = 2kHz}
n _{Guaranteed Operation to 125°C}
n _{2.5V Supply}
n _{Pseudo-Differential Unipolar Input Range: 0V to VREF}
n _{VREF Input Range from 2.5V to 5.1V}
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-Lead 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
LTC2369-18
18-Bit, 1.6Msps, Pseudo-
Differential Unipolar SAR
ADC with 96.5dB SNR
DESCRIPTION
The LTC^®2369-18 is a low noise, low power, high speed
18-bit successive approximation register (SAR) ADC.
Operating from a 2.5V supply, the LTC2369-18 has a 0V
to V_REF pseudo-differential unipolar input range with V_REF
ranging from 2.5V to 5.1V. The LTC2369-18 consumes only
18mW and achieves ±2.5LSB INL maximum, no missing
codes at 18 bits with 96.5dB SNR.
The LTC2369-18 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 LTC2369-18
ideally suited for a wide variety of high speed applications.
An internal oscillator sets the conversion time, easing exter-
nal timing considerations. The LTC2369-18 automatically
powers down between conversions, leading to reduced
power dissipation that scales with the sampling rate.
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
2.5V 1.8V TO 5V
V_REF
0V
+
LT^®6202
–
10μF
0.1μF
5.1Ω
V_DD
OV_DD
CHAIN
IN⁺
RDL/SDI
10nF
LTC2369-18
IN^–
SDO
SCK
BUSY
REF
GND
CNV
2.5V TO 5.1V
236918 TA01a
47μF
(X5R, 0805 SIZE)
SAMPLE CLOCK
32k Point FFT f_S = 1.6Msps, f_IN = 2kHz
0
SNR = 96.5dB
–20
THD = –127dB
SINAD = 96.5dB
–40
SFDR = 134dB
–60
–80
–100
–120
–140
–160
–180
0
100 200 300 400 500 600 700 800
FREQUENCY (kHz)
236918 TA01b
236918fa
1