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000-0046140-111
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SLG46140
9.4 ADC Input Voltage Definition
The ADC’s input voltage (V
IN_ADC
) is calculated based on either the single-ended or differential operation modes the logic cell is
set to. In single-ended mode V
IN_ADC
is the positive input voltage multiplied by the gain of the PGA. While in differential mode
the V
IN_ADC
is the difference between the positive and negative input voltages multiplied by the gain of the PGA plus one half of
the reference voltage.
V
OUT(PGA)
= V
IN(ADC)
= G
·
(V
inp
+ V
os(RTI)
) - for SE mode
V
OUT(PGA)
= V
IN(ADC)
= G
·
V
ind
+ V
os(RTO)
- for DI and PD mode
V
os
- PGA offset voltage. RTI and RTO denotes referred to input and referred to output V
os
.
G - PGA nominal gain
V
ind
- PGA input voltage (differential):
V
ind
= V
inp
- V
inn
Figure 31. Typical PGA Gain Error vs. Vin,
Pseudo-Differential Mode, G= 4, VDD = 1.71 V
-3
-2.5
-2
-1.5
-1
-0.5
0
0
50
100
150
200
250
300
G
a
in Error, %
Vin
-40°C
+25°C
+85°C
Figure 32. Typical PGA Gain Error vs. Vin,
Pseudo-Differential Mode, G= 4, VDD = 5.5 V
-3
-2.5
-2
-1.5
-1
-0.5
0
0
50
100
150
200
250
300
G
a
in Error,
%
Vin
-40°C
+25°C
+85°C
V
os RTI
V
os RTO
G
-----------------------
=
V
inp
V
cm
V
ind
2
-----------
+
=
V
inn
V
cm
V
ind
2
-----------
–
=
Содержание GreenPAK SLG46140
Страница 102: ...000 0046140 111 Page 101 of 169 SLG46140 14 1 Initial Polarity Operations Figure 54 DFF Polarity Operations ...
Страница 103: ...000 0046140 111 Page 102 of 169 SLG46140 Figure 55 DFF Polarity Operations with nReset ...
Страница 104: ...000 0046140 111 Page 103 of 169 SLG46140 Figure 56 DFF Polarity Operations with nSet ...