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| 型号： | AD7151BRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/28页 |
| 文件大小： | 0K |
| 描述： | IC CAP CONV 1CH ULT LP 10MSOP |
| 特色产品： | AD715x Series Capacitance-to-Digital Converters & Evaluation Board |
| 标准包装： | 50 |
| 类型： | 电容数字转换器 |
| 输入类型： | 电压 |
| 输出类型： | 数字 |
| 接口： | 2 线串口 |
| 电流 - 电源： | 120µA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 781 (CN2011-ZH PDF) |
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AD7151
Rev. 0 | Page 10 of 28
ARCHITECTURE AND MAIN FEATURES
DIGITAL
FILTER
POWER-DOWN
TIMER
CLOCK
GENERATOR
SERIAL
INTERFACE
POWER SUPPLY
MONITOR
CIN
CX
EXC
Σ-Δ CDC
EXCITATION
CAPDAC
THRESHOLD
SCL
VDD
GND
AD7151
SDA
PROGRAMMING
INTERFACE
DIGITAL
OUTPUT
OUT
3.3V
07
08
6-
01
0
Figure 20. AD7151 Block Diagram
The AD7151 core is a high performance capacitance-to-digital
converter (CDC) that allows the part to be interfaced directly to
a capacitive sensor.
The comparator compares the CDC result with thresholds, either
fixed or dynamically adjusted by the on-chip adaptive threshold
algorithm engine. Thus, the output indicates a defined change in
the input sensor capacitance.
The AD7151 also integrates an excitation source and CAPDAC
for the capacitive inputs, an input multiplexer, a complete clock
generator, a power-down timer, a power supply monitor, control
logic, and an I2C-compatible serial interface for configuring the
part and accessing the internal CDC data and status, if required
in the system (see Figure 20).
CAPACITANCE-TO-DIGITAL CONVERTER
Figure 21 shows the CDC simplified functional diagram. The
converter consists of a second-order sigma delta (Σ-Δ), charge
balancing modulator and a third-order digital filter. The
measured capacitance CX is connected between an excitation
source and the Σ-Δ modulator input. The excitation signal is
applied on the CX during the conversion, and the modulator
continuously samples the charge going through the CX. The
digital filter processes the modulator output, which is a stream
of 0s and 1s containing the information in 0 and 1 density. The
data is processed by the adaptive threshold engine and output
comparators; the data can be also read through the serial interface.
The AD7151 is designed for floating capacitive sensors.
Therefore, both CX plates have to be isolated from ground or
any other fixed potential node in the system.
The AD7151 features slew rate limiting on the excitation voltage
output, which decreases the energy of higher harmonics on the
excitation signal and dramatically improves the system
electromagnetic compatibility (EMC).
DIGITAL
FILTER
0x000 TO 0xFFF
DATA
CLOCK
GENERATOR
CAPACITANCE TO DIGITAL CONVERTER
(CDC)
CIN
CX
0pF TO 4pF
EXC
EXCITATION
Σ-Δ
MODULATOR
07
08
6-
01
1
Figure 21. CDC Simplified Block Diagram
CAPDAC
The AD7151 CDC core maximum full-scale input range is 4 pF.
However, the part can accept a higher capacitance on the input,
and the offset (nonchanging component) capacitance of up to 10
pF can be balanced by a programmable on-chip CAPDAC.
0x000 TO 0xFFF
DATA
CIN
EXC
CAPDAC
10pF
0pF TO 4pF
CDC
CSENS
10pF TO 14pF
07
08
6-
0
12
Figure 22. Using CAPDAC
The CAPDAC can be understood as a negative capacitance
connected internally to the CIN pin. The CAPDAC has a 6-bit
resolution and a monotonic transfer function. Figure 22 shows
how to use the CAPDAC to shift the CDC 4 pF input range to
measure capacitance between 10 pF and 14 pF.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7151BRMZ-REEL | 功能描述:IC CAP CONV 1CH ULT LP 10MSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
| AD7152 | 制造商:AD 制造商全称:Analog Devices 功能描述:12-Bit Capacitance-to-Digital Converter |
| AD7152BRMZ | 功能描述:IC CDC 12BIT 2/4CH 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Data Converter Basics 标准包装:1 系列:- 类型:电机控制 分辨率（位）:12 b 采样率（每秒）:1M 数据接口:串行，并联 电压电源:单电源 电源电压:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:100-TQFP 供应商设备封装:100-TQFP（14x14） 包装:剪切带 (CT) 其它名称:296-18373-1 |
| AD7152BRMZ-REEL | 功能描述:IC CDC 12BIT 2/4CH 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 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:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7153 | 制造商:AD 制造商全称:Analog Devices 功能描述:12-Bit Capacitance-to-Digital Converter |
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