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Keywords:
a/d, analog-to-digital converter, ADC, amplifiers, analog, filters, analog front-end, SNR, THD, SINAD,
1.6Msps, amplifier, fully differential, evaluation kit
APPLICATION NOTE 6034
HOW TO SELECT AND DESIGN AMPLIFIER
BUFFER AND PASSIVE COMPONENTS TO
OPTIMIZE PERFORMANCE FOR THE MAX11905
EVALUATION KITS
By:
Kien Mach
Abstract: The MAX11905EVKIT# and the MAX11905DIFEVKIT# are two different evaluation kits to demonstrate
the MAX11905, 20-bit, 1.6Msps, low-power fully differential SAR ADC. Each kit includes two solutions for the
analog front end. The first is design is for low offset and low noise for DC input. The latter is design for low SFDR
and low noise for AC input. Details of each design are described in this application note.
Overview
The
MAX11905 is a 20-bit, 1.6Msps, low-power fully differential SAR ADC. Both the MAX11905EVKIT# and the
MAX11905DIFEVKIT#
use a MAX6126, 3.0V voltage reference (V ). Both inputs of the ADC expect a voltage
of 0V to V
. The differential input range is from (-V ) to V . For the ADC to achieve excellent performance,
the proper amplifiers and lowpass filters must be placed at the inputs of the ADC (
Figure 1).
Figure 1. Lowpass filter at MAX11905.
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