TC1796
Peripheral Units (Vol. 2 of 2)
Fast Analog-to-Digital Converter (FADC)
User’s Manual 26-7 V2.0, 2007-07
FADC, V2.0
Note: Due to the temperature characteristics of offset and gain of the internal amplifiers
a TUE (total unadjusted error) cannot be specified. The input impedance for Rp
and Rn is defined in the TC1796 Data Sheet.
Note: The analog input lines of the FADC can also be used as input lines for other ADCs.
If both (regular ADC and FADC) are connected to the same pin at the same time,
the input impedances of the analog inputs must be taken into account in order to
minimize signal distortions and measurement errors.
Table 26-1 Conversion Results in the Different Measurement Modes
Measurements Modes ACRx.
ENP
ACRx.
ENN
FAINxP FAINxN ACRx.
GAIN
Conv.
Results
Single-ended
Measurement Mode
(Configuration 1)
0 1 don’t care 0 00
B
768
3.3 256
001
B
1023
3.3 0
Single-ended
Measurement Mode
(Configuration 2)
1 0 0 V don’t care 00
B
256
3.3 768
001
B
0
3.3 1023
Differential
Measurement Mode
(Configuration 3)
110 1.6500
B
256
03.3 0
1.65 0 768
3.3 0 1023
3.3 1.65 768
01.6501
B
0
1.65 0 1023
3.3 1.65 1023
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