18-Bit, 1Msps, Pseudo-Differential Unipolar SAR ADC with 97dB SNR

The LTC2368-18 is a low noise, low power, high speed 18-bit successive approximation register (SAR) ADC. Operating from a 2.5V supply, the LTC2368-18 has a 0V to VREF pseudo-differential unipolar input range with VREF ranging from 2.5V to 5.1V. The LTC2368-18 consumes only 13.5mW and achieves ±2.5LSB INL maximum, no missing codes at 18 bits with 97dB SNR.

The LTC2368-18 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 LTC2368-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2368-18 automatically powers down between conversions, leading to reduced power dissipation that scales with the sampling rate.

Applications

* Medical Imaging

* High Speed Data Acquisition

* Portable or Compact Instrumentation

* Industrial Process Control

* Low Power Battery-Operated Instrumentation

* ATE

* 1Msps Throughput Rate

* ±2.5LSB INL (Max)

* Guaranteed 18-Bit No Missing Codes

* Low Power: 13.5mW at 1Msps, 13.5μW at 1ksps

* 97dB SNR (Typ) at fIN = 2kHz

* –120dB THD (Typ) at fIN = 2kHz

* Guaranteed Operation to 125°C

* 2.5V Supply

* Pseudo-Differential Unipolar Input Range: 0V to 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