DESCRIPTION
Demonstration circuit 1826A features the LTC®2389 low noise, high speed successive approximation register ADC which operates from a single 5V supply. The following text refers to the LTC2389-18, but also applies to the LTC2389-16, the only difference being the number of bits. 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. The LTC2389-18 achieves ±2.5LSB INL (maximum), with no missing codes at 18 bits.

The DC1826A demonstrates the performance of the LTC2389-18 in conjunction with the DC718 QuikEval™ II data collection board.

The demonstration circuit 1826A is intended to demonstrate recommended grounding, component placement and selection, routing and bypassing for this ADC. Several suggested driver circuits for the analog inputs will be presented.