ADV
ANCEINFORMA
TION
ADC
R
on
Switch
ADCINxN
C
h
C
p
ADCINxP
AC
R
s
R
on
Switch
R
s
C
p
VSSA
ADC
R
on
Switch
VREFLO
C
h
C
p
ADCINx
AC
R
s
TMS320F28377S, TMS320F28376S, TMS320F28375S, TMS320F28374S
SPRS881A – AUGUST 2014 – REVISED JUNE 2015
5.8.1.1.1 ADC Input Models
NOTE
ADC channels ADCINA0, ADCINA1, and ADCINB0 have a 50-k
Ω
pulldown resistor to V
SSA
.
For single-ended operation, the ADC input characteristics are given by
and
.
Table 5-44. Single-Ended Input Model Parameters
DESCRIPTION
VALUE (12-BIT MODE)
C
p
Parasitic input capacitance
See
R
on
Sampling switch resistance
425
Ω
C
h
Sampling capacitor
14.5 pF
R
s
Nominal source impedance
50
Ω
Figure 5-28. Single-Ended Input Model
For differential operation, the ADC input characteristics are given by
and
Table 5-45. Differential Input Model Parameters
DESCRIPTION
VALUE (16-BIT MODE)
C
p
Parasitic input capacitance
See
R
on
Sampling switch resistance
700
Ω
C
h
Sampling capacitor
16.5 pF
R
s
Nominal source impedance
50
Ω
Figure 5-29. Differential Input Model
98
Specifications
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