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參數資料
| 型號： | AD7745ARUZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 24-Bit Capacitance-to-Digital Converter with Temperature Sensor |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 24BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | LEAD FREE, MO-153-AB, TSSOP-16 |
| 文件頁數： | 20/28頁 |
| 文件大?。?/td> | 391K |
| 代理商： | AD7745ARUZ-REEL7 |
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AD7745/AD7746
CIRCUIT DESCRIPTION
Rev. 0 | Page 20 of 28
DIGITAL
FILTER
24-BIT
Σ
-
MODULATOR
CLOCK
GENERATOR
MUX
TEMP
SENSOR
CAP DAC
CAP DAC
VOLTAGE
REFERENCE
CONTROL LOGIC
CALIBRATION
AD7745
VDD
REFIN(+) REFIN(–)
Figure 26. AD7745 Block Diagram
GND
SDA
SCL
RDY
VIN(+)
VIN(–)
CIN1(+)
CIN1(–)
EXCA
EXCB
0
I
2
C
SERIAL
INTERFACE
EXCITATION
DIGITAL
FILTER
24-BIT
Σ
-
MODULATOR
MUX
TEMP
SENSOR
CAP DAC
CAP DAC
VOLTAGE
REFERENCE
CONTROL LOGIC
CALIBRATION
AD7746
VDD
REFIN(+) REFIN(–)
Figure 27. AD7746 Block Diagram
GND
SDA
SCL
RDY
VIN(+)
VIN(–)
CIN1(+)
CIN1(–)
CIN2(+)
CIN2(–)
EXC1
EXC2
0
CLOCK
GENERATOR
I
2
C
SERIAL
INTERFACE
EXCITATION
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 I
2
C-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 C
X
is connected between the excitation
source and the Σ-Δ modulator input. A square-wave excitation
signal is applied on the C
X
during the conversion and the
modulator continuously samples the charge going through the
C
X
. 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 C
X
plates have to be isolated from
ground.
DIGITAL
FILTER
24-BIT
Σ
-
MODULATOR
CLOCK
GENERATOR
CAPACITANCE TO DIGITAL CONVERTER
(CDC)
0
EXCITATION
DATA
EXC
CIN
X
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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| AD7746ARUZ-REEL7 | 24-Bit Capacitance-to-Digital Converter with Temperature Sensor |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7746 | 制造商:AD 制造商全稱:Analog Devices 功能描述:24-Bit Capacitance-to-Digital Converter with Temperature Sensor |
| AD7746ARUZ | 功能描述:IC CONV 2CH CAP TO DGTL 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數據接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| AD7746ARUZ-REEL | 功能描述:IC CONV 2CH CAP TO DGTL 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數據接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| AD7746ARUZ-REEL7 | 功能描述:IC CONV 2CH CAP TO DGTL 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數據接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| AD7747 | 制造商:AD 制造商全稱:Analog Devices 功能描述:24-Bit Capacitance-to-Digital Converter with Temperature Sensor |
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