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DC1826A-E

18-Bit/16-Bit, 2.5Msps Low Noise, SAR ADCs with Pin-Configurable Analog Input Range

Linear Technology 

DEMO MANUAL DC1826A

LTC2389

18-Bit/16-Bit, 2.5Msps Low Noise,

SAR ADCs with Pin-Configurable

Analog Input Range

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 demon-

strate recommended grounding, component placement

and selection, routing and bypassing for this ADC. Several

suggested driver circuits for the analog inputs will be

presented.

Design files for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope

and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

BOARD PHOTO

Figure 1. DC1826A Connection Diagram

dc1826afa

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