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參數(shù)資料
| 型號： | EVAL-AD7156EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/28頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7156 |
| 標準包裝： | 1 |
| 傳感器類型： | 觸摸，電容式 |
| 接口： | I²C |
| 電源電壓： | 1.8 V ~ 3.6 V |
| 嵌入式： | 否 |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | AD7156 |
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AD7156
Rev. 0 | Page 19 of 28
SETUP REGISTERS
Ch 1 Address Pointer 0x0B
Ch 2 Address Pointer 0x0E
8 Bits, Read/Write, Factory Preset 0x0B
Table 10. Setup Registers Bit Map1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RngH
RngL
Hyst
ThrSettling (4-Bit Value)
(0)
(0x0B)
1 The default values are given in parentheses.
Table 11. Setup Registers Bit Descriptions
Bit
Mnemonic
Description
Range bits set the CDC input range and determine the step for the auto-DAC function.
7
6
RngH
RngL
RngH
RngL
Capacitive Input Range (pF)
Auto-DAC Step (CAPDAC LSB)
0
2
4
0
1
0.5
1
0
1
2
1
4
8
5
This bit should be 0 for the specified operation.
4
Hyst
Hyst = 1 disables hysteresis in adaptive threshold mode. This bit has no effect in fixed threshold mode;
hysteresis is always disabled in the fixed threshold mode.
[3:0]
ThrSettling
Determines dynamic behavior of the data average and thus the settling time of the adaptive thresholds. Data
average is calculated from the previous CDC output data, using 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 the programmable parameter.
The response of the average to an input capacitance step change (that is, response to the change in the CDC
output data) is an exponential settling curve 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 can be selected in the range between 2 and 65,536 conversion cycle multiples, in steps of power of
2, by programming the ThrSettling bits. TimeConst = 2(ThrSettling + 1)
INPUT CAPACITANCE
(CDC DATA) CHANGE
DATA AVERAGE RESPONSE
TIME
07
72
6-
0
4
9
Figure 39. Data Average Response to Data Step Change
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD7156EBZ | 制造商:Analog Devices 功能描述:EVAL BOARD, AD7156 2CH CAPACITANCE CONVE |
| EVAL-AD7170EBZ | 功能描述:BOARD EVAL FOR AD7170 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7171EBZ | 功能描述:BOARD EVAL FOR AD7171 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7173-8SDZ | 制造商:Analog Devices 功能描述:EVAL BOARD MULTI CHANNEL - Boxed Product (Development Kits) |
| EVAL-AD7175-8SDZ | 功能描述:AD7175-8 - 24 Bit 250k Samples per Second Analog to Digital Converter (ADC) Evaluation Board 制造商:analog devices inc. 系列:- 零件狀態(tài):有效 A/D 轉(zhuǎn)換器數(shù):1 位數(shù):24 采樣率（每秒）:250k 數(shù)據(jù)接口:并聯(lián) 輸入范圍:±VREF 不同條件下的功率（典型值）:105mW @ 250kSPS 使用的 IC/零件:AD7175-8 所含物品:板，電源 標準包裝:1 |
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