LTC2378-18 - 18-Bit, 1Msps, Low Power SAR ADC with 102dB SNR

The LTC®2378-18 is a low noise, low power, high speed 18-bit successive approximation register (SAR) ADC. Operating from a 2.5V supply, the LTC2378-18 has a ±VREF fully differential input range with VREF ranging from 2.5V to 5.1V. The LTC2378-18 consumes only 13.5mW and achieves ±1.75LSB INL maximum, no missing codes at 18 bits with 102dB SNR.

The LTC2378-18 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 1Msps throughput with no cycle latency makes the LTC2378-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2378-18 automatically powers down between conversions, leading to reduced power dissipation that scales with the sampling rate.

The LTC2378-18 features a unique digital gain compression (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.

  • 1Msps Throughput Rate
  • ±1.75LSB INL (Max)
  • Guaranteed 18-Bit No Missing Codes
  • Low Power: 13.5mW at 1Msps, 13.5μW at 1ksps
  • 102dB SNR (typ) at fIN = 2kHz
  • –124dB THD (typ) at fIN = 2kHz
  • Digital Gain Compression (DGC)
  • Guaranteed Operation to 125°C
  • 2.5V Supply
  • Fully Differential Input Range ±VREF
  • VREF Input Range from 2.5V to 5.1V
  • 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
  • 16-Lead MSOP and 4mm × 3mm DFN Packages
Typical Application
LTC2378-18 Typical Application
LTC2378-18 Typical Application
  • Medical Imaging
  • High Speed Data Acquisition
  • Portable or Compact Instrumentation
  • Industrial Process Control
  • Low Power Battery-Operated Instrumentation
  • ATE
LTC2378-18 Package Drawing
LTC2378-18 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2378CDE-18#PBF4x3 DFN-16C$35.00$24.50
LTC2378CDE-18#TRPBF4x3 DFN-16C$24.56
LTC2378IDE-18#PBF4x3 DFN-16I$40.25$28.18
LTC2378IDE-18#TRPBF4x3 DFN-16I$28.24
Demo Boards
Part NumberDescriptionPrice
DC1783A-FLTC2378-18 with LTC6655-5/LT6350 Demo Board | 18-Bit, 1Msps, SAR ADC with 102dB SNR. Req DC718 or DC2026$150.00
DC1805A-FLTC6362 with 1Msps 18-bit LTC2378-18 Demo Board | SAR ADC, LTC6655-5. Req DC718 or DC2026$150.00
Companion Boards
Part NumberDescriptionPrice
DC1075AClock Divider board$50.00
DC2026CLinduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform$75.00
DC718CUSB Data Acquisition Controller, for PScope Evaluation Kits (<135Mbps)$300.00
Reliability Data
Product Selector Card
Software and Simulation
CAD Symbol
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Precision Signal Chain Products Selector Guide
SAR ADC Drivers
SAR ADC Input Types
DC1783A_REVA FPGA/CPLD Source Code
LTC2378-18 Footprints and Symbols
LTC2378 - DC1925A Linduino .INO File
LTC2378 Linduino .CPP File
LTC2378 Linduino Header File