参数资料
型号: AD7156BCPZ-REEL7
厂商: Analog Devices Inc
文件页数: 11/28页
文件大小: 0K
描述: IC CDC 2CH 12BIT 1.8V 10LFCSP
标准包装: 1
类型: 电容数字转换器
分辨率(位): 12 b
采样率(每秒): 100k
数据接口: 串行
电压电源: 单电源
电源电压: 1.8 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘,CSP
供应商设备封装: 10-LFCSP-WD(3x3)
包装: 标准包装
产品目录页面: 781 (CN2011-ZH PDF)
其它名称: AD7156BCPZ-REEL7DKR
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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