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| 型號： | AD7194BCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 50/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT SPI 4.8K 32-LFCSP |
| 產(chǎn)品培訓模塊： | Weigh Scale Introduction |
| 標準包裝： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 4.8k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 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： | 32-WFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 32-LFCSP-WQ（5x5） |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 8 個差分，單極；8 個差分，雙極；16 個偽差分，單極；16 偽差分，雙極 |
| 產(chǎn)品目錄頁面： | 777 (CN2011-ZH PDF) |
| 其它名稱： | AD7194BRUZ AD7194BRUZ-ND |
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Data Sheet
AD7194
Rev. A | Page 53 of 56
APPLICATIONS INFORMATION
The AD7194 provides a low cost, high resolution analog-to-
digital function. Because the analog-to-digital function is
provided by a Σ- architecture, the part is more immune to noisy
environments, making it ideal for use in sensor measurement and
industrial and process control applications.
FLOWMETER
Figure 67 shows the AD7194 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
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.
In Figure 67, temperature compensation is performed using
a 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 voltage has no affect on the measurement
(it is the ratio of the precision reference resistance to the thermistor
resistance that is measured).
For simplicity, external filters are not shown in Figure 67;
however, an R-C antialias filter must be included on each analog
input. This is required because the on-chip digital filter does
not provide any rejection around the modulator sampling
frequency or multiples of this frequency. Suitable values are a
100 Ω resistor in series with each analog input, a 0.1 μF capacitor
between the analog input pins, and a 0.01 μF capacitor from
each analog input pin to AGND.
MCLK1 MCLK2
REFIN2(+)
RREF
REFIN2(–)
DVDD DGND
5V
AIN1
IN+
IN–
OUT–
OUT+
AIN2
AIN5
AIN6
REFIN1(–)
AD7194
REFIN1(+)
REFERENCE
DETECT
SERIAL
INTERFACE
AND
CONTROL
LOGIC
CLOCK
CIRCUITRY
AVDD
AGND
DOUT/RDY
DIN
SCLK
CS
SYNC
AVDD
AGND
AIN7
AIN8
IN+
IN–
OUT–
OUT+
Σ-Δ ADC
PGA
MUX
08566-
066
Figure 67. Typical Application (Flowmeter)
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| AD7194BCPZ-REEL | 功能描述:IC ADC 24BIT SPI 4.8KHZ 32LFCSP 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） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| AD7194BCPZ-REEL7 | 功能描述:IC ADC 24BIT SPI 4.8KHZ 32LFCSP 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） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| AD7195 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA and AC Excitation |
| AD7195BCPZ | 功能描述:IC AFE 24BIT 4.8K 32LFSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模擬前端 (AFE) 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數(shù):- 通道數(shù):2 功率（瓦特）:- 電壓 - 電源，模擬:3 V ~ 3.6 V 電壓 - 電源，數(shù)字:3 V ~ 3.6 V 封裝/外殼:32-VFQFN 裸露焊盤 供應商設備封裝:32-QFN（5x5） 包裝:帶卷 (TR) |
| AD7195BCPZ | 制造商:Analog Devices 功能描述:IC ADC 24BIT 4.8KSPS CSP-32 |
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