DDC232_15 Datasheet, PDF (18/34 Pages) Texas Instruments – 32-Channel, Current-Input Analog-to-Digital Converter

DDC232
SBAS331D – AUGUST 2004 – REVISED APRIL 2010
Noncontinuous Mode
Figure 13 and Figure 14 illustrate operation in Noncontinuous mode.
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Start Integration Side A
End Integration Side A
Start Integration Side B
End Integration Side B
Wait State
CONV
t_INT
t_INT
A/D Conversion
Odd Channels
A/D Conversion
Even Channels
DVALID
t_ADCONV
t_ADRST
t_ADCONV
Side A Data Ready
t_NCDR1
Start Integration Side A
Release
State
t_NCRL
t_NCIRST
Side B Data Ready
t_NCDR2
Figure 13. Conversion Detail for the Internal Operation of Noncontinuous Mode
with Side A Integrated First
Table 11. Timing Characteristics for the Internal Operation in Noncontinuous Mode
SYMBOL
t_INT
t_ADCONV
t_ADRST
t_NCIRST
t_NCRL
t_NCDR1
t_NCDR2
DESCRIPTION
Integration Time (Noncontinuous mode)
A/D Conversion Time (internally controlled)
A/D Conversion Reset Time (internally controlled)
Noncontinuous Mode Integrator Reset Time (internally
controlled)
Release Time
1st Noncontinuous Mode Data Ready
2nd Noncontinuous Mode Data Ready
DDC232C
(CLK = 5MHz, Clk_4x = 0)
MIN
TYP
MAX
50
1,000,000
135.6
3.2
30.4
0.4
276.5
304.8
DDC232CK
(CLK = 10MHz, Clk_4x = 0)
MIN
TYP
MAX
50
1,000,000
67.8
1.6
15.2
0.2
138.2
152.4
BLANKSPACE
UNITS
ms
ms
ms
ms
ms
ms
ms
Start Integration Side B
End Integration Side B
Start Integration Side A
End Integration Side A
CONV
t_INT
Wait State
t_INT
A/D Conversion
Odd Channels
A/D Conversion
Even Channels
DVALID
t_ADCONV
t_ADRST
t_ADCONV
Side B Data Ready
Start Integration Side B
Release
State
t_NCRL
t_NCIRST
Side A Data Ready
Figure 14. Internal Operation Noncontinuous Mode Timing with Side B Integrated First
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