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參數(shù)資料
| 型號： | EVAL-AD7152EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL AD7152 |
| 標準包裝： | 1 |
| 傳感器類型： | 觸摸，電容式 |
| 接口： | I²C |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 嵌入式： | 否 |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | AD7152 |
| 產品目錄頁面： | 781 (CN2011-ZH PDF) |
| 相關產品： | AD7152BRMZ-ND - IC CDC 12BIT 2/4CH 10MSOP AD7152BRMZ-REEL-ND - IC CDC 12BIT 2/4CH 10MSOP |
AD7152/AD7153
Rev. 0 | Page 18 of 24
CIRCUIT DESCRIPTION
DIGITAL
FILTER
12-BIT Σ-Δ
MODULATOR
CLOCK
GENERATOR
VOLTAGE
REFERENCE
AD7152
I2C
SERIAL
INTERFACE
07
45
0-
0
25
EXCITATION
EXC2
CIN1(+)
CIN1(–)
CIN2(+)
CIN2(–)
EXC1
SDA
SCL
VDD
GND
CONTROL LOGIC
CALIBRATION
CAP+
CAP–
MUX
CAPACITANCE-TO-DIGITAL CONVERTER (CDC)
Figure 27 shows the CDC simplified functional diagram. The
measured capacitance CX is connected between the excitation
source and the Σ-Δ modulator input. A square-wave excitation
signal is applied on the CX during the conversion and the mod-
ulator 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 from the digital filter is scaled, applying the
calibration coefficients, and the final result can be read through
the serial interface. The AD7152/AD7153 are designed for
floating capacitive sensors. Therefore, both CX plates have to
be isolated from ground.
Figure 25. AD7152 Block Diagram
DIGITAL
FILTER
12-BIT Σ-Δ
MODULATOR
CLOCK
GENERATOR
VOLTAGE
REFERENCE
AD7153
I2C
SERIAL
INTERFACE
07
45
0-
02
6
EXCITATION
CIN1(+)
CIN1(–)
EXC1
SDA
SCL
VDD
GND
CONTROL LOGIC
CALIBRATION
CAP+
CAP–
MUX
DIGITAL
FILTER
12-BIT Σ-Δ
MODULATOR
CLOCK
GENERATOR
CAPACITANCE-TO-DIGITAL CONVERTER
(CDC)
07
45
0-
0
27
EXCITATION
DATA
EXC
CIN
CX
Figure 27. CDC Simplified Block Diagram
EXCITATION SOURCE
Figure 26. AD7153 Block Diagram
The AD7152/AD7153 have one excitation source. For the
AD7152, the excitation source is switched between the
excitation pins, EXC1 and EXC2, depending on which
channel performs a conversion.
The core of the AD7152/AD7153 is a precision converter
consisting of a second-order modulator (Σ-Δ or charge-
balancing) and a third-order digital filter.
In addition to the converter, the AD7152/AD7153 integrate a
multiplexer, an excitation source, and CAPDACs for the capaci-
tive inputs, a voltage reference, a complete clock generator, a
control and calibration logic, and an I2C-compatible serial
interface.
The AD7153 has one capacitive input, while the AD7152 has
two capacitive inputs. For the AD7152, the modulator input and
the excitation source are multiplexed between the converting
channel. All other features and specifications are identical for
both parts.
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