Rainbow-electronics ATmega128RFA1 Manuel d'utilisateur Page 416

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416
8266A-MCU Wireless-12/09
ATmega128RFA1
Table 27-3. Conversion Start Delay
Channel ADPS Delay from Conversion Start Request to Sample &
Hold t
SCSMP
0, 1 2 CPU clock cycles
2 4 CPU clock cycles
3 0 CPU clock cycles
Single-Ended
4…7 0 CPU clock cycles
Differential 0…7 2 ADC clock cycles
Table 27-4. Tracking Time
Channel Tracking Phase Duration t
TRCK
in ADC Clock Cycles
Single-Ended ADTHT+1, minimum 500 ns
Differential 2ADTHT+3
Table 27-5. Sample Rate in Free Running Mode
Channel Sample Rate in ADC Clock Cycles
Single-Ended ADTHT+12
Differential 2ADTHT+14
Figure 27-6. ADC Timing Diagram, Single Conversion
A D C C loc k
A D EN
A D SC
A D IF
A D C H
A D C L
M U X a nd R E F S Up d a te
11 T
A D C_C L K
t
TR C K
T rac k ingC o n ve rs io n
t
S C SM P
S ign an d M S B o f R e su lt
LS B o f R es u lt
M U X a nd R E F S Up d a te
C o n ve rs io n
C o m ple te
t
S C SM P
C o n ve rs io n
P r es ca le r R e se t
an d
S a m ple & H old
P r es ca le r
R e se t
an d
S a m ple
& H old
Figure 27-7. ADC Timing Diagram, Auto Triggered Conversion
A D C C lo ck
A D E N
T r ig g er S ou rc e
A D IF
A D C H
A D C L
M U X a nd R E F S U pd a te
11 T
A D C _ C LK
t
T R C K
T r ac kingC on ve rsion
t
S C S MP
S ign a nd M S B o f R e s ult
LS B o f R e su lt
M U X a nd R E F S U pd a te
C o nv e rs ion
C o m p lete
t
S C S MP
C o nv e rs ion
Pr e s ca le r R e se t
an d
Sa m ple & H o ld
A D A T E
Pr e s ca ler
R e se t
an d
Sa m ple
& H old
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