LTC2378-20 - 20-Bit, 1Msps, Low Power SAR ADC with 0.5ppm INL

The LTC®2378-20 is a low noise, low power, high speed 20-bit successive approximation register (SAR) ADC. Operating from a 2.5V supply, the LTC2378-20 has a ±VREF fully differential input range with VREF ranging from 2.5V to 5.1V. The LTC2378-20 consumes only 21mW and achieves ±2ppm INL maximum, no missing codes at 20 bits with 104dB SNR.

The LTC2378-20 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 LTC2378-20 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2378-20 automatically powers down between conversions, leading to reduced power dissipation that scales with the sampling rate.

The LTC2378-20 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
  • ±0.5ppm INL (Typ)
  • Guaranteed 20-Bit No Missing Codes
  • Low Power: 21mW at 1Msps, 21μW at 1ksps
  • 104dB SNR (Typ) at fIN = 2kHz
  • –125dB THD (Typ) at fIN = 2kHz
  • Digital Gain Compression (DGC)
  • Guaranteed Operation to 85°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

  • Medical Imaging
  • High Speed Data Acquisition
  • Portable or Compact Instrumentation
  • Industrial Process Control
  • Low Power Battery-Operated Instrumentation
  • ATE

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2378CDE-20#PBF4x3 DFN-16C$42.14$29.50
LTC2378CDE-20#TRPBF4x3 DFN-16C$29.56
LTC2378IDE-20#PBF4x3 DFN-16I$48.46$33.93
LTC2378IDE-20#TRPBF4x3 DFN-16I$33.99
Demo Boards
Part NumberDescriptionPrice
DC1925A-ALTC2378-20 Demo Board | 20-Bit, 1Msps, SAR ADC with 104dB SNR. Req DC2026$200.00
DC2135ALTC2378-20 and LT1468 Demo | Converts ±10V Single-Ended Signal with 2ppm Linearity (req. DC590 or DC890)$200.00
Companion Boards
Part NumberDescriptionPrice
DC2026CLinduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform$75.00
DC890BUSB Data Acquisition Controller, for PScope Evaluation Kits (up to 250Mbps, CMOS/LVDS)$300.00
DC590BIsolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards$50.00
Design Note
Reliability Data
Product Selector Card
Press Release
Software and Simulation
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