- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9487 > AD7745ARUZ-REEL (Analog Devices Inc)IC CONV 1CH CAP TO DGTL 16TSSOP PDF資料下載
參數(shù)資料
| 型號： | AD7745ARUZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/28頁 |
| 文件大小： | 0K |
| 描述： | IC CONV 1CH CAP TO DGTL 16TSSOP |
| 設(shè)計資源： | Extending the Capacitive Input Range of AD7745/AD7746 (CN0129) |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 電容數(shù)字轉(zhuǎn)換器 |
| 分辨率（位）： | 24 b |
| 數(shù)據(jù)接口： | 串行 |
| 電壓電源： | 單電源 |
| 電源電壓： | 2.7 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-TSSOP |
| 包裝： | 帶卷 (TR) |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁當(dāng)前第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VI-B0Y-MX-S | CONVERTER MOD DC/DC 3.3V 49.5W |
| MS17344R24C22S | CONN PLUG 4POS STRAIGHT W/SCKT |
| VI-B0X-MY-S | CONVERTER MOD DC/DC 5.2V 50W |
| VI-B0W-MY-S | CONVERTER MOD DC/DC 5.5V 50W |
| VI-B0V-MY-S | CONVERTER MOD DC/DC 5.8V 50W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7745ARUZ-REEL7 | 功能描述:IC CONV 1CH CAP TO DGTL 16TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)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(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| 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(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)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(yīng)商設(shè)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(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)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(yīng)商設(shè)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(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)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(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。