Table of Contents
Advertisement
www.ti.com
8.1
ADC12 Input Impedance Model
Figure 8-2
shows a simplified model of the input circuit of UCD3138 ADC12.
The first portion is a 16-to-1 multiplexer that selects the channel to be converted. The second portion is
the sample and hold circuit that is controlled by the control block of ADC12. There are several factors to
be considered in the ADC input path: the resistance of the CMOS switches and the capacitances
associated with them; the leakage resistance, and the sample and hold capacitance.
The external components are also to be considered.
channel containing the external circuit and the source impedance.
Figure 8-3. ADC Input Impedance Model Containing External Circuits
SNIU028A – February 2016 – Revised April 2016
Submit Documentation Feedback
Figure 8-2. ADC12 Input Impedance Model
Copyright © 2016, Texas Instruments Incorporated
Figure 8-3
shows the ADC input model of one
ADC12 Input Impedance Model
ADC12 Overview
299
Hide quick links:
Advertisement
Chapters
Table of Contents
