TC1784
Fast Analog to Digital Converter (FADC)
User´s Manual
24-3
V1.1, 2011-05
FADC, V2.21
As shown in
, 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
The analog block 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. It is supplied by V
DDIF
/ V
SSMF
(3.3 V - 5 V).
The V
DDIF
supply does not appear as supply pin in the pin list, because it is internally
connected to the V
DDM
supply of the ADC that is sharing the FADC input pins.
•
A channel amplifier with a settling time of about 5µs if its configuration is changed by
SW (changing between unused, differential, single-ended N, or single-ended P
mode). It is supplied by V
DDMF
/ V
SSMF
(3.3 V).
•
Input channels 2 and 3 are overlaid with ADC1 input signals (AN28, AN29, AN30,
AN31), whereas input channels 0 and 1 are available on dedicated input pins (AN32,
AN33, AN34, AN35).
Input levels on enabled FADC inputs must not exceed V
DDMF
, whereas those of
disabled FADC inputs must not exceed V
DDIF
.
•
A 10-bit analog converter stage supplied by V
DDAF
/ V
SSAF
(1.2 V) to be delivered
externally. The inputs for the FADC reference voltage (3.3 V max.) and the FADC
reference ground V
FAREF
/ V
FAGND
are connected to pins.
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