Datasheet

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SBAS255C − JUNE 2004 − REVISED APRIL 2009
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18
t
12
T
INT
T
INT
t
16
t
12
t
13
t
15
t
17
Release
State
End Integration Side A
Start Integration Side B
End Integration Side B
Wait State
Side A
Data Ready
Side B
Data Ready
Start Integration Side A
Start Integration Side A
CONV
A/D Conversion
Input 1 and 2
A/D Conversion
Input 3 and 4
DVALID
Figure 14. Conversion Detail for the Internal Operation of Non-Continuous Mode
with Side A Integrated First
Table 8. Internal Timing for the DDC114 in Non-Continuous Mode
SYMBOL
DESCRIPTION
CLK = 4MHz, CLK_4X = 0 CLK = 4.8MHz, CLK_4X = 0
UNITS
SYMBOL
DESCRIPTION
MIN TYP MAX MIN TYP MAX
UNITS
T
INT
Integration Time (non-continuous mode) 400 1,000,000 320 1,000,000 µs
t
12
A/D Conversion Time (internally controlled) 169.5 141.25 µs
t
13
A/D Conversion Reset Time (internally controlled) 4 3.333 µs
t
15
Integrator and A/D Conversion Reset Time
(internally controlled)
19.5 16.25 µs
t
16
Total A/D Conversion and Reset Time (internally controlled) 725.25 ± 0.25 604.375 ± 0.208 µs
t
17
Release Time 18 15 µs
t
12
T
INT
T
INT
t
16
t
12
t
13
t
15
t
17
CONV
A/D Conversion
Inputs 1 and 2
A/D Conversion
Inputs 3 and 4
DVALID
Release
State
End Integration Side B
Start Integration Side A
End Integration Side A
Wait State
Side B
Data Ready
Side A
Data Ready
Start Integration Side B
Start Integration Side B
Figure 15. Internal Operation Timing Diagram of Non-Continuous Mode with Side B Integrated First