LTC2389-18 - 18-Bit, 2.5Msps SAR ADC with Pin-Configurable Analog Input Range and 99.8dB SNR

The LTC®2389-18 is a low noise, high speed 18-bit successive approximation register (SAR) ADC. Operating from a single 5V supply, the LTC2389-18 supports pinconfigurable fully differential (±4.096V), pseudo-differential unipolar (0V to 4.096V), and pseudo-differential bipolar (±2.048V) analog input ranges, allowing it to interface with multiple signal chain formats without requiring additional level translation or signal conditioning. The LTC2389-18 achieves ±3LSB INL (maximum), no missing codes at 18-bits, and 99.8dB (fully differential)/ 95.2dB (pseudo differential) SNR (typical).

The LTC2389-18 includes a precision internal 4.096V reference, with a guaranteed 0.5% initial accuracy and a ±20ppm/°C (maximum) temperature coefficient, as well as an internal reference buffer. Fast 2.5Msps throughput with no cycle latency in the parallel interface modes makes the LTC2389-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2389-18 dissipates only 162.5mW at 2.5Msps, while both nap and sleep power-down modes are provided to further reduce power consumption during inactive periods.

  • 2.5Msps Throughput Rate
  • ±3LSB INL (Max)
  • Guaranteed 18-Bit, No Missing Codes
  • Pin-Configurable Analog Input Range: ±4.096V Fully Differential 0V to 4.096V Pseudo-Differential Unipolar ±2.048V Pseudo-Differential Bipolar
  • 99.8dB (Fully Differential)/95.2dB (Pseudo Differential) SNR (Typ) at fIN = 2kHz
  • –116dB (Fully Differential)/–112dB (Pseudo Differential) THD (Typ) at fIN = 2kHz
  • Guaranteed Operation to 125°C
  • Single 5V Supply
  • Internal 20ppm/°C (Max) Reference
  • Internal Reference Buffer
  • 162.5mW Power Dissipation at 2.5Msps
  • No Pipeline Delay, No Cycle Latency
  • 1.8V to 5V I/O Voltages
  • Parallel and Serial I/O Interface
  • 48-pin 7mm × 7mm LQFP and QFN Packages
Typical Application
LTC2389-18 Typical Application
LTC2389-18 Typical Application
  • Medical Imaging
  • High Speed, Wide Dynamic Range Data Acquisition
  • Industrial Process Control
  • Instrumentation
  • ATE
LTC2389-18 Package Drawing
LTC2389-18 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2389CLX-18#PBF7x7 LQFP-48C$48.43$33.90
LTC2389CUK-18#PBF7x7 QFN-48C$48.43$33.90
LTC2389CUK-18#TRPBF7x7 QFN-48C$33.96
LTC2389HLX-18#PBF7x7 LQFP-48H$64.05$44.83
LTC2389ILX-18#PBF7x7 LQFP-48I$55.69$38.99
LTC2389IUK-18#PBF7x7 QFN-48I$55.69$38.99
LTC2389IUK-18#TRPBF7x7 QFN-48I$39.05
Demo Boards
Part NumberDescriptionPrice
DC1826A-ALTC2389-18 with LTC6655/LT6201, 18-Bit, 2.5Msps, Serial/Parallel SAR ADC with 99.8dB SNR. Req DC718$150.00
Companion Boards
Part NumberDescriptionPrice
DC718CUSB Data Acquisition Controller, for PScope Evaluation Kits (<135Mbps)$300.00
Reliability Data
Product Selector Card
Press Release
CAD Symbol
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Precision Signal Chain Products Selector Guide
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LTC2389-18 Footprints and Symbols
18-Bit 2.5Msps SAR ADC 100dB SNR