LTC2338-18
18-Bit, 1Msps, 10.24V
True Bipolar, Fully Differential
Input ADC with 100dB SNR
DESCRIPTION
FEATURES
TheLTC®2338-18isalownoise,highspeed18-bitsucces-
siveapproximationregister(SAR)ADCwithfullydifferential
inputs.Operatingfromasingle5Vsupply,theLTC2338-18
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.
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1Msps Throughput Rate
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4LSB INL (Max)
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Guaranteed 18-Bit No Missing Codes
Fully Differential Inputs
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True Bipolar Input Ranges 6.25V, 10.24V, 12.5V
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100dB SNR (Typ) at f = 2kHz
IN
IN
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–115dB THD (Typ) at f = 2kHz
Guaranteed Operation to 125°C
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.
Single 5V Supply
Low Drift (20ppm/°C Max) 2.048V Internal Reference
Onboard Single-Shot Capable Reference Buffer
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
Power Dissipation 50mW (Typ)
16-Lead MSOP Package
APPLICATIONS
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Programmable Logic Controllers
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Industrial Process Control
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High Speed Data Acquisition
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.
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Portable or Compact Instrumentation
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ATE
TYPICAL APPLICATION
32k Point FFT fS = 1Msps, fIN = 2kHz
5V
1.8V TO 5V
0
SNR = 100.3dB
–20
–40
THD = –117dB
SINAD = 100.2dB
SFDR = –119dB
10µF
2.2µF
0.1µF
V
V
OV
DD
DD
DDLBYP
+10.24V
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
–60
+
–
IN
+
–
–80
–10.24V
+10.24V
LTC2338-18
–100
–120
–140
–160
–180
IN
SAMPLE CLOCK
–10.24V
REF
REFBUF
REFIN
100nF
GND
233818 TA01
47µF
0
100
200
300
400
500
FREQUENCY (kHz)
233818 TA01
233818fa
1
For more information www.linear.com/LTC2338-18
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