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參數(shù)資料
| 型號： | AD7156BCPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/28頁 |
| 文件大小： | 0K |
| 描述： | IC CDC 2CH 12BIT 1.8V 10LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 電容數(shù)字轉(zhuǎn)換器 |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 100k |
| 數(shù)據(jù)接口： | 串行 |
| 電壓電源： | 單電源 |
| 電源電壓： | 1.8 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 10-LFCSP-WD（3x3） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 781 (CN2011-ZH PDF) |
| 其它名稱： | AD7156BCPZ-REEL7DKR |
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AD7156
Rev. 0 | Page 13 of 28
DATA AVERAGE
The adaptive threshold algorithm is based on an average calculated
from the previous CDC output data, using the following equation:
1
2
)
1
(
)
(
)
1
(
)
(
+
+
=
g
ThrSettlin
N
Average
N
Data
N
Average
N
Average
where:
Average(N) is the new average value.
Average(N 1) is the average value from the previous cycle.
Data(N) is the latest complete CDC conversion result.
ThrSettling is a parameter, programmable in the setup registers.
A more specific case of the input capacitance waveform is a step
change. The response of the average to an input capacitance step
change (more exactly, response to a step change in the CDC output
data) is an exponential settling curve, which can be characterized
by the following equation:
)
1
(
)
0
(
)
(
/TimeConst
N
e
Change
Average
N
Average
+
=
where:
Average(N) is the value of average N complete CDC conversion
cycles after a step change on the input.
Average(0) is the value before the step change.
TimeConst = 2(ThrSettling + 1)
ThrSettling is a parameter, programmable in the setup registers.
See Figure 31 and the Register Descriptions section for further
information.
INPUT CAPACITANCE
(CDC DATA) CHANGE
DATA AVERAGE RESPONSE
TIME
07
72
6-
0
38
Figure 31. Data Average Response to Data Step Change
HYSTERESIS
In adaptive threshold mode, the comparator features hysteresis.
The hysteresis is fixed to of the threshold sensitivity and can
be programmed on or off. The comparator does not have hyster-
esis in the fixed threshold mode.
OUTPUT
POSITIVE
THRESHOLD
DATA AVERAGE
OUTPUT ACTIVE
TIME
HYSTERSIS
DATA
07
72
6-
04
0
Figure 32. Threshold Hysteresis
TIMEOUT
In the case of a large, long change in the capacitive input, when
the data average adapting to a new condition takes too long, a
timeout can be set.
The timeout becomes active (counting) when the CDC data
goes outside the band of data average ± sensitivity. When the
timeout elapses (a defined number of CDC conversions is
counted), the data average (and thus the thresholds), is forced
to follow the new CDC data value immediately (see Figure 33).
The timeout can be set independently for approaching (for change
in data toward the threshold) and for receding (for change in data
Descriptions section for further information.
DATA AVERAGE
+ SENSITIVITY
LARGE CHANGE IN DATA
DATA AVERAGE
– SENSITIVITY
TIME
TIMEOUT
07
72
6-
0
41
Figure 33. Threshold Timeout After a Large Change in CDC Data
INPUT
CAPACITANCE
THRESHOLD
OUTPUT
DATA AVERAGE
OUTPUT ACTIVE
TIME
TIMEOUT APPROACHING
0772
6-
0
42
Figure 34. Approaching Timeout in Negative Threshold Mode
Shortens False Output Trigger
INPUT
CAPACITANCE
LARGE CHANGE
THRESHOLD
OUTPUT
OUTPUT ACTIVE
TIME
TIMEOUT RECEDING
0
77
26
-04
3
Figure 35. Positive Timeout in Negative Threshold Mode
Shortens Period of Missing Output Trigger
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