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

The LTC2389-18 is a low noise, high speed 18-bit successive approximation register (SAR) ADC. Operating from a single 5V supply, the LTC2389-18 supports pin-configurable 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.

Applications

* Medical Imaging

* High Speed, Wide Dynamic Range Data Acquisition

* Industrial Process Control

* Instrumentation

* ATE

* 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