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参数资料
| 型号： | AD7156BCPZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC CDC 2CH 12BIT 1.8V 10-LFCSP |
| 标准包装： | 5,000 |
| 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： | 带卷 (TR) |
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AD7156
Rev. 0 | Page 18 of 28
AVERAGE REGISTERS
Ch 1 Address Pointer 0x05, Address Pointer 0x06
Ch 2 Address Pointer 0x07, Address Pointer 0x08
16 Bits, Read Only
Default Value 0x0000
These registers show the average calculated from the previous
CDC data. The 12-bit CDC result corresponds to the 12 MSBs
of the average register.
The settling time of the average can be set by programming
the ThrSettling bits in the setup registers. The average register
is overwritten directly with the CDC output data, that is, the
history is erased if the timeout is enabled and elapses.
FIXED THRESHOLD REGISTERS
Ch 1 Address Pointer 0x09, Address Pointer 0x0A
Ch 2 Address Pointer 0x0C, Address Pointer 0x0D
16 Bits, Read/Write, Factory Preset 0x0886
A constant threshold for the output comparator in the fixed
threshold mode can be set using these registers. The 12-bit
CDC result corresponds to the 12 MSBs of the threshold regis-
ter. The fixed threshold registers share the address pointer and
location on chip with the sensitivity and timeout registers. The
fixed threshold registers are not accessible in the adaptive thre-
shold mode.
SENSITIVITY REGISTERS
Ch 1 Address Pointer 0x09
Ch 2 Address Pointer 0x0C
8 Bits, Read/Write, Factory Preset 0x08
Sensitivity registers set the distance of the positive threshold above
the data average, and the distance of the negative threshold below
the data average, in the adaptive threshold mode.
NEGATIVE
THRESHOLD
POSITIVE
THRESHOLD
DATA AVERAGE
OUTPUT ACTIVE
TIME
SENSITIVITY
DATA
SENSITIVITY
0
77
26
-0
45
Figure 37. Threshold Sensitivity
The sensitivity is an 8-bit value and is mapped to the lower eight
bits of the 12-bit CDC data, that is, it corresponds to the 16-bit
data register as shown in Figure 38.
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3
SENSITIVITY
BIT 2 BIT 1 BIT 0
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2
12-BIT CDC RESULT
BIT 1 BIT 0 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2
DATA HIGH
DATA LOW
BIT 1 BIT 0
07
72
6-
04
6
Figure 38. Relation Between Sensitivity Register and CDC Data Register
For an ideal part with no gain error, the sensitivity can be
calculated using the following equation:
)
(pF
_
2560
_
)
pF
(
Range
Input
Reg
Sens
y
Sensitivit
×
=
Or the same equation with hexadecimal numbers
)
(pF
_
00
xA
0
_
)
pF
(
Range
Input
Reg
Sens
y
Sensitivit
×
=
With gain error included, the sensitivity can be calculated using
the following equation:
+
×
=
%
100
(%)
_
1
)
pF
(
_
2560
_
)
pF
(
Error
Gain
Range
Input
Reg
Sense
y
Sensitivit
Or the same equation with hexadecimal numbers
+
×
=
%
100
(%)
_
1
)
pF
(
_
00
xA
0
_
)
pF
(
Error
Gain
Range
Input
Reg
Sense
y
Sensitivit
TIMEOUT REGISTERS
Ch 1 Address Pointer 0x0A
Ch 2 Address Pointer 0x0D
8 Bits, Read/Write, Factory Preset 0x86
Table 9. Timeout Register Bit Map
Bit
Mnemonic
Default
[7:4]
TimeOutApr
0x08
[3:0]
TimeOutRec
0x06
These registers set timeouts for the adaptive threshold mode.
The approaching timeout starts when the CDC data crosses the
data average ± sensitivity band toward the threshold, according
to the selected positive, negative, or window threshold mode.
The approaching timeout elapses after the number of conversion
cycles equals 2TimeOutApr, where TimeOutApr is the value of the
four most significant bits of the timeout register.
The receding timeout starts when the CDC data crosses
the data average ± sensitivity band away from the threshold,
according to the selected positive or negative threshold mode.
The receding timeout is not used in the window threshold
mode. The receding timeout elapses after the number of
conversion cycles equals 2TimeOutRec, where TimeOutRec is the
value of the four least significant bits of the timeout register.
When either the approaching or receding timeout elapses (that
is, after the defined number of CDC conversions is counted),
the data average (and thus the thresholds) is forced to follow
the new CDC data value immediately.
When the timeout register equals 0, timeouts are disabled.
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