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TC1784
Introduction
User´s Manual
1-47
V1.1, 2011-05
Intro, V1.0
As shown in
Figure 1-14
, the main FADC functional blocks are:
•
An Input Structure containing the differential inputs and impedance control.
•
An A/D Converter Stage responsible for the analog-to-digital conversion including an
input multiplexer to select between the channel amplifiers
•
A Data Reduction Unit containing programmable anti-aliasing and data reduction
filters
•
A Channel Trigger Control block determining the trigger and gating conditions for the
FADC channels
•
A Channel Timer for each channel to independently trigger the conversions
•
An A/D Control block responsible for the overall FADC functionality
FADC Power Supply and References
The FADC module is supplied by the following power supply and reference voltage lines:
•
V
DDMF
/ V
SSMF
: FADC Analog Channel Amplifier Power Supply (3.3 V)
•
V
DDIF
/ V
SSMF
: FADC Analog Input Stage Power Supply (3.3 - 5 V),
the V
DDIF
supply does not appear as supply pin, because it is internally connected to
the V
DDM
supply of the ADC that is sharing the FADC input pins.
•
V
DDAF
/ V
SSAF
: FADC Analog Part Power Supply (1.2 V),
to be fed in externally
•
V
FAREF
/ V
FAGND
: FADC Reference Voltage (3.3 V max.) and FADC Reference Ground
Input Structure
The input structure of the FADC in the TC1784 contains:
•
A differential analog input stage for each input channel to select the input impedance
(differential or single-ended measurement) and to decouple the FADC input signal
from the pins.
•
All input channels are overlaid with ADC1 input signals (AN24 - AN31).
•
A channel amplifier for each input channel with a settling time (about 5µs) when
changing the characteristics of an input stage (changing between unused,
differential, single-ended N, or single-ended P mode).
Содержание TC1784
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