Features

• 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 f_IN = 2kHz
• –116dB (Fully Differential)/–112dB (Pseudo Differential) THD (Typ) at f_IN = 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

Description

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.