![NXP Semiconductors MPC5746R Скачать руководство пользователя страница 28](http://html1.mh-extra.com/html/nxp-semiconductors/mpc5746r/mpc5746r_datasheet_1721855028.webp)
11.2.1 Input equivalent circuit and ADC conversion characteristics
R
F
C
F
R
S
R
L
R
SW1
C
P2
V
DD_HV_IO
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
R
S
Source Impedance
R
F
Filter Resistance
C
F
Filter Capacitance
R
L
Current Limiter Resistance
R
SW1
Channel Selection Switch Impedance
R
AD
Sampling Switch Impedance
C
P
Pin Capacitance (two contributions, C
P1
and C
P2
)
C
S
Sampling Capacitance
C
P1
R
AD
Channel
Selection
V
A
C
S
Figure 11. Input equivalent circuit
Table 19. ADC conversion characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
f
CK
,
ADC Clock frequency (depends
on ADC configuration) (The duty
cycle depends on AD_CK
frequency.)
—
20
—
80
MHz
f
s
Sampling frequency
—
—
—
1.00
MHz
t
sample
Sample time
—
250
—
—
ns
t
conv
80 MHz
700
—
—
ns
C
S
,
ADC input sampling capacitance —
—
3
5
pF
C
P1
ADC input pin capacitance 1
—
—
—
5
pF
C
P2
ADC input pin capacitance 2
—
—
—
0.8
pF
R
SW1
Internal resistance of analog
source
V
REF
range = 4.5 to 5.5 V
—
—
0.3
kΩ
V
REF
range = 3.0 to 3.6 V —
—
875
Ω
R
AD
Internal resistance of analog
source
—
—
—
825
Ω
INL
Integral non-linearity
—
–2
—
2
LSB
DNL
Differential non-linearity
—
–1
—
1
LSB
OFS
Offset error
—
–6
—
6
LSB
GNE
Gain error
—
–6
—
6
LSB
Input (double ADC
channel)
Max leakage
150 °C
—
—
300
nA
Table continues on the next page...
ADC modules
SPC5746R Microcontroller Data Sheet, Rev. 6, 06/2017
28
NXP Semiconductors