LTC2338-18_15 Datasheet, PDF (1/24 Pages) Linear Technology – True Bipolar, Fully Differential Input ADC with 100dB SNR

LTC2338-18
Features
18-Bit, 1Msps, ±10.24V
True Bipolar, Fully Differential
Input ADC with 100dB SNR
Description
n _{1Msps Throughput Rate}
n _{±4LSB INL (Max)}
n _{Guaranteed 18-Bit No Missing Codes}
n _{Fully Differential Inputs}
n _{True Bipolar Input Ranges ±6.25V, ±10.24V, ±12.5V}
n _{100dB SNR (Typ) at fIN = 2kHz}
n _{–115dB THD (Typ) at fIN = 2kHz}
n _{Guaranteed Operation to 125°C}
n _{Single 5V Supply}
n _{Low Drift (20ppm/°C Max) 2.048V Internal Reference}
n _{Onboard Single-Shot Capable Reference Buffer}
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 _{Power Dissipation 50mW (Typ)}
n _{16-Lead MSOP Package}
Applications
n _{Programmable Logic Controllers}
n _{Industrial Process Control}
n _{High Speed Data Acquisition}
n _{Portable or Compact Instrumentation}
n _ATE
The LTC^®2338-18 is a low noise, high speed 18-bit succes-
sive approximation register (SAR) ADC with fully differential
inputs. Operating from a single 5V supply, the LTC2338-18
has a ±10.24V true bipolar input range, making it ideal for
high voltage applications which require a wide dynamic
range. The LTC2338-18 achieves ±4LSB INL maximum,
no missing codes at 18-bits with 100dB SNR.
The LTC2338-18 has an onboard single-shot capable
reference buffer and low drift (20ppm/°C max) 2.048V
temperature compensated reference. The LTC2338-18
also has a high speed SPI-compatible serial interface that
supports 1.8V, 2.5V, 3.3V and 5V logic while also featur-
ing a daisy-chain mode. The fast 1Msps throughput with
no cycle latency makes the LTC2338-18 ideally suited
for a wide variety of high speed applications. An internal
oscillator sets the conversion time, easing external timing
considerations. The LTC2338-18 dissipates only 50mW
and automatically naps between conversions, leading to
reduced power dissipation that scales with the sampling
rate. A sleep mode is also provided to reduce the power
consumption of the LTC2338-18 to 300μW for further
power savings during inactive periods.
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, 7961132.
Typical Application
+10.24V
+
–10.24V
+10.24V
–
–10.24V
5V
10µF
1.8V TO 5V
2.2µF
0.1µF
V_DD
IN⁺
V_DDLBYP OV_DD
LTC2338-18
IN^–
RERFEBFUF
REFIN GND
47µF
100nF
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
233818 TA01
SAMPLE CLOCK
For more information www.linear.com/2338-18
32k Point FFT f_S = 1Msps, f_IN = 2kHz
0
SNR = 100.3dB
–20
THD = –117dB
SINAD = 100.2dB
–40
SFDR = –119dB
–60
–80
–100
–120
–140
–160
–180
0
100 200 300 400 500
FREQUENCY (kHz)
233818 TA01
233818f
1