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參數(shù)資料
| 型號： | AD7794BRU-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 30/37頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT 6CH LP 24-TSSOP |
| 標準包裝： | 2,500 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 470 |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 2.5mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-TSSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 6 個差分，單極；6 個差分，雙極 |
| 配用： | EVAL-AD7794EBZ-ND - BOARD EVALUATION FOR AD7794 |
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AD7794/AD7795
Rev. D | Page 35 of 36
APPLICATIONS INFORMATION
The AD7794/AD7795 offer low cost, high resolution analog-to-
digital functions. Because the analog-to-digital function is
provided by a ∑-Δ architecture, it makes the parts more immune
to noisy environments, making them ideal for use in sensor
measurement, and industrial and process control applications.
FLOWMETER
Figure 24 shows the AD7794/AD7795 being used in a
flowmeter application that consists of two pressure transducers,
with the rate of flow being equal to the pressure difference. The
pressure transducers shown are the BP01 from Sensym. The
pressure transducers are arranged in a bridge network and give
a differential output voltage between its OUT+ and OUT–
terminals. With rated full-scale pressure (in this case
300 mmHg) on the transducer, the differential output voltage is
3 mV/V of the input voltage (that is, the voltage between the
IN(+) and IN(–) terminals).
Assuming a 5 V excitation voltage, the full-scale output range
from the transducer is 15 mV. The excitation voltage for the
bridge can be used to directly provide the reference for the
ADC, as the reference input range includes the supply voltage.
A second advantage of using the AD7794/AD7795 in transducer-
based applications is that the low-side power switch can be fully
utilized in low power applications. The low-side power switch is
connected in series with the cold side of the bridges. In normal
operation, the switch is closed and measurements can be taken.
In applications where power is of concern, the AD7794/AD7795
can be placed in standby mode, thus significantly reducing the
power consumed in the application. In addition, the low-side
power switch can be opened while in standby mode, thus
avoiding unnecessary power consumption by the front-end
transducers. When the parts are taken out of standby mode, and
the low-side power switch is closed, the user should ensure that
the front-end circuitry is fully settled before attempting a read
from the AD7794/AD7795.
In the diagram, temperature compensation is performed using a
thermistor. The on-chip excitation current supplies the thermistor.
In addition, the reference voltage for the temperature measurement
is derived from a precision resistor in series with the thermistor.
This allows a ratiometric measurement so that variation of the
excitation current has no effect on the measurement (it is the
ratio of the precision reference resistance to the thermistor
resistance that is measured).
04
85
4-
0
25
DOUT/RDY
DIN
SCLK
CS
DVDD
SERIAL
INTERFACE
AND
LOGIC
CONTROL
Σ-Δ
ADC
AD7794/AD7795
AIN1(+)
REFIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
AIN3(+)
AIN3(–)
REFIN2(+)
IOUT1
REFIN1(–)
IN-AMP
VDD
GND
MUX
PSW
GND
INTERNAL
CLOCK
CLK
GND
AVDD
VDD
IN+
IN–
OUT–
OUT+
IN+
IN–
OUT–
OUT+
RCM
VDD
REFIN2(–)
BUF
Figure 24. Typical Application (Flowmeter)
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| AD7794BRUZ | 功能描述:IC ADC 24BIT SIG-DEL 6CH 24TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7794BRUZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:6-Channel, Low Noise, Low Power, 24-/16-Bit ?￡-?? ADC with On-Chip In-Amp and Reference |
| AD7794BRUZ-REEL | 功能描述:IC ADC 24BIT 6CH LP 24-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| AD7794BRUZ-REEL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:6-Channel, Low Noise, Low Power, 24-/16-Bit ?￡-?? ADC with On-Chip In-Amp and Reference |
| AD7794CRU | 制造商:Analog Devices 功能描述:AFE 6CH 24/16BIT 470HZ 24T 制造商:Analog Devices 功能描述:AFE, 6CH, 24/16BIT, 470HZ, 24TSSOP; IC Function:Analogue Front End Device IC; Supply Voltage Min:2.7V; Supply Voltage Max:5.25V; Operating Temperature Min:-40C; Operating Temperature Max:125C; Digital IC Case Style:TSSOP; No. of ;RoHS Compliant: Yes |
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