Features
nn 250ksps Throughput Rate
nn ±1.75LSB INL (Max)
nn Guaranteed 18-Bit No Missing Codes
nn Low Power: 3.4mW at 250ksps, 3.4µW at 250sps
nn 102dB SNR (Typ) at fIN = 2kHz
nn –126dB THD (Typ) at fIN = 2kHz
nn Digital Gain Compression (DGC)
nn Guaranteed Operation to 125°C
nn 2.5V Supply
nn Fully Differential Input Range ±VREF
nn VREF Input Range from 2.5V to 5.1V
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 16-Lead MSOP and 4mm × 3mm DFN Packages
Applications
nn Medical Imaging
nn High Speed Data Acquisition
nn Portable or Compact Instrumentation
nn Industrial Process Control
nn Low Power Battery-Operated Instrumentation
nn ATE
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.
LTC2376-18
18-Bit, 250ksps, Low Power
SAR ADC with 102dB SNR
Description
The LTC®2376-18 is a low noise, low power, high speed
18-bit successive approximation register (SAR) ADC. Op-
erating from a 2.5V supply, the LTC2376-18 has a ±VREF
fully differential input range with VREF ranging from 2.5V
to 5.1V. The LTC2376-18 consumes only 3.4mW and
achieves ±1.75LSB INL maximum, no missing codes at
18 bits with 102dB SNR.
The LTC2376-18 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 250ksps
throughput with no cycle latency makes the LTC2376-18
ideally suited for a wide variety of high speed applications.
An internal oscillator sets the conversion time, easing exter-
nal timing considerations. The LTC2376-18 automatically
powers down between conversions, leading to reduced
power dissipation that scales with the sampling rate.
The LTC2376-18 features a unique digital gain compres-
sion (DGC) function, which eliminates the driver amplifier’s
negative supply while preserving the full resolution of the
ADC. When enabled, the ADC performs a digital scaling
function that maps zero-scale code from 0V to 0.1 • VREF
and full-scale code from VREF to 0.9 • VREF. For a typical
reference voltage of 5V, the full-scale input range is now
0.5V to 4.5V, which provides adequate headroom for
powering the driving amplifier from a single 5.5V supply.
Typical Application
2.5V 1.8V TO 5V
10µF
0.1µF
VREF
+
20Ω
6800pF
VDD OVDD CHAIN
IN+
RDL/SDI
0V
SDO
VREF
0V
3300pF
LTC2376-18
SCK
–
20Ω
IN–
6800pF
REF
BUSY
CNV
GND REF/DGC
2.5V TO 5.1V
237618 TA01
47µF
(X5R, 0805 SIZE)
SAMPLE CLOCK
VREF
For more information www.linear.com/LTC2376-18
32k Point FFT fS = 250ksps, fIN = 2kHz
0
SNR = 102.3dB
–20
THD = –126dB
SINAD = 102.2dB
–40
SFDR = 127dB
–60
–80
–100
–120
–140
–160
–180
0
25
50
75
100 125
FREQUENCY (kHz)
237618 TA02
237618fa
1
