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| 型号： | DDC118IRTCT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 8-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC48 |
| 封装： | GREEN, PLASTIC, QFN-48 |
| 文件页数： | 18/35页 |
| 文件大小： | 653K |
| 代理商： | DDC118IRTCT |
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DDC118
SBAS325B JUNE 2004 REVISED APRIL 2009
www.ti.com
25
RETRIEVAL BEFORE AND AFTER CONV
TOGGLES (CONTINUOUS MODE)
For the absolute maximum time for data retrieval, data can
be retrieved before and after CONV toggles. Nearly all of
TINT is available for data retrieval. Figure 25 illustrates
how this is done by combining the two previous methods.
Retrieval during CONV toggling to prevent digital noise, as
discussed previously, and finished before the next data is
ready. The maximum number of DDC118s that can be
daisy-chained together (FORMAT = high) is:
T
INT
* 20ms * 1.75ms
160
t
DCLK
NOTE: 128
τDCLK is used for FORMAT = low.
For TINT = 400s and DCLK = 10MHz, the maximum
number of DDC118s is 23 (or 29 for FORMAT = low).
RETRIEVAL: NONCONTINUOUS MODE
Retrieving in noncontinuous mode is slightly different,
compared to the continuous mode. As illustrated in
Figure 26, DVALID goes low in time t30 after the first
integration completes. If TINT is shorter than this time, all
of t31 is available to retrieve data before the other side data
is ready. For TINT > t30, the first integration data is ready
before the second integration completes. Data retrieval
must be delayed until the second integration completes,
leaving less time available for retrieval. The time available
is t31 – (TINT – t30). The second integration’s data must be
retrieved before the next round of integration begins. This
time is highly dependent on the pattern used to generate
CONV. As with the continuous mode, data retrieval must
halt before and after CONV toggles (t28, t29) and be
completed before new data is ready (t26).
SYMBOL
DESCRIPTION
CLK = 4MHZ, CLK_4X = 0
CLK = 4.8MHZ, CLK_4X = 0
UNITS
SYMBOL
DESCRIPTION
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
t26
Hold Time that DOUT is Valid Before Falling Edge of DVALID
1.75
1.458
s
t28
Data Retrieval Shutdown Before Edge of CONV
10
s
t29
Data Retrieval Start-Up After Edge of CONV
10
s
Figure 25. Readback Before and After CONV Toggles
SYMBOL
DESCRIPTION
CLK = 4MHz, CLK_4X = 0
CLK = 4.8MHz, CLK_4X = 0
UNITS
SYMBOL
DESCRIPTION
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
t30
1st ncont Mode Data Ready
344.75
± 0.25
287.292
± 0.208
s
t31
2nd ncont Mode Data Ready
362.500
302.083
s
Figure 26. Readback in Non-Continuous Mode
……
…
……
…
DCLK
DVALID
CONV
DOUT
Side B
Data
Side A
Data
T
INT
t
29
t
28
t
26
T
INT
T
INT
……
T
IN T
T
IN T
t
30
T
IN T
T
IN T
t
31
Side A
Data
Side B
Data
CONV
DVALID
DCLK
DOUT
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