LTC2327-18
Features
18-Bit, 500ksps, ±10.24V
True Bipolar, Pseudo-Differential
Input ADC with 95dB SNR
Description
nn 500ksps Throughput Rate
nn ±5LSB INL (Max)
nn Guaranteed 18-Bit No Missing Codes
nn Pseudo-Differential Inputs
nn True Bipolar Input Ranges ±6.25V, ±10.24V, ±12.5V
nn 95dB SNR (Typ) at fIN = 2kHz
nn –111dB THD (Typ) at fIN = 2kHz
nn Guaranteed Operation to 125°C
nn Single 5V Supply
nn Low Drift (20ppm/°C Max) 2.048V Internal Reference
nn Onboard Single-Shot Capable Reference Buffer
nn No Pipeline Delay, No Cycle Latency
nn 1.8V to 5V I/O Voltages
nn SPI-Compatible Serial I/O with Daisy-Chain Mode
nn Internal Conversion Clock
nn Power Dissipation 36mW (Typ)
nn 16-Lead MSOP Package
Applications
nn Programmable Logic Controllers
nn Industrial Process Control
nn High Speed Data Acquisition
nn Portable or Compact Instrumentation
nn ATE
The LTC®2327-18 is a low noise, high speed 18-bit suc-
cessive approximation register (SAR) ADC with pseudo-
differential inputs. Operating from a single 5V supply,
the LTC2327-18 has a ±10.24V true bipolar input range,
making it ideal for high voltage applications which require
a wide dynamic range. The LTC2327-18 achieves ±5LSB
INL maximum, no missing codes at 18 bits with 95dB SNR.
The LTC2327-18 has an onboard single-shot capable
reference buffer and low drift (20ppm/°C max) 2.048V
temperature compensated reference. The LTC2327-18
also 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 500ksps throughput with
no cycle latency makes the LTC2327-18 ideally suited
for a wide variety of high speed applications. An internal
oscillator sets the conversion time, easing external timing
considerations. The LTC2327-18 dissipates only 36mW
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 LTC2327-18 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
+
LT®1468
–
5V
10µF
1.8V TO 5V
2.2µF
0.1µF
VDD
IN+
VDDLBYP OVDD
LTC2327-18
IN–
RERFEBFUF
REFIN GND
47µF
100nF
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
232718 TA01
SAMPLE CLOCK
For more information www.linear.com/LTC2327-18
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
32k Point FFT fS = 500ksps,
fIN = 2kHz
SNR = 95.3dB
THD = –113dB
SINAD = 95.2dB
SFDR = –116dB
50 100 150 200 250
FREQUENCY (kHz)
232718 TA01b
232718fb
1
