參數(shù)資料
型號： EVAL-AD7746EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 13/28頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7746
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 ~ 5.25 V
嵌入式： 否
已供物品： 板，纜線，CD
已用 IC / 零件： AD7746
產(chǎn)品目錄頁面： 781 (CN2011-ZH PDF)
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AD7745/AD7746
Rev. 0 | Page 20 of 28
CIRCUIT DESCRIPTION
DIGITAL
FILTER
24-BIT
Σ-
MODULATOR
CLOCK
GENERATOR
MUX
TEMP
SENSOR
CAP DAC
VOLTAGE
REFERENCE
CONTROL LOGIC
CALIBRATION
AD7745
VDD
REFIN(+) REFIN(–)
GND
SDA
SCL
RDY
VIN(+)
VIN(–)
CIN1(+)
CIN1(–)
EXCA
EXCB
05468-
001
I2C
SERIAL
INTERFACE
EXCITATION
Figure 26. AD7745 Block Diagram
DIGITAL
FILTER
24-BIT
Σ-
MODULATOR
MUX
TEMP
SENSOR
CAP DAC
VOLTAGE
REFERENCE
CONTROL LOGIC
CALIBRATION
AD7746
VDD
REFIN(+) REFIN(–)
GND
SDA
SCL
RDY
VIN(+)
VIN(–)
CIN1(+)
CIN1(–)
CIN2(+)
CIN2(–)
EXC1
EXC2
05468-
002
CLOCK
GENERATOR
I2C
SERIAL
INTERFACE
EXCITATION
Figure 27. AD7746 Block Diagram
OVERVIEW
The AD7745/AD7746 core is a high precision converter con-
sisting of a second order (Σ-Δ or charge balancing) modulator
and a third order digital filter. It works as a CDC for the capa-
citive inputs and as a classic ADC for the voltage input or for
the voltage from a temperature sensor.
In addition to the converter, the AD7745/AD7746 integrates a
multiplexer, an excitation source and CAPDACs for the capa-
citive inputs, a temperature sensor, a voltage reference for the
voltage and temperature inputs, a complete clock generator, a
control and calibration logic, and an I2C-compatible serial
interface.
The AD7745 has one capacitive input, while the AD7746 has
two capacitive inputs. All other features and specifications are
identical for both parts.
CAPACITANCE-TO-DIGITAL CONVERTER
Figure 28 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
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 from the digital filter is scaled, applying the
calibration coefficients, and the final result can be read through
the serial interface.
The AD7745/AD7746 is designed for floating capacitive
sensors. Therefore, both CX plates have to be isolated from
ground.
DIGITAL
FILTER
24-BIT
Σ-
MODULATOR
CLOCK
GENERATOR
CAPACITANCE TO DIGITAL CONVERTER
(CDC)
05468-027
EXCITATION
DATA
EXC
CIN
CX
Figure 28. CDC Simplified Block Diagram
EXCITATION SOURCE
The two excitation pins EXCA and EXCB are independently
programmable. They are identically functional and therefore
either of them can be used for the capacitive sensor excitation.
On the 2-channel AD7746 using a separate excitation pin for
each capacitive channel is recommended.
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