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參數資料
| 型號： | AD7707BR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 3 V/5 V, +-10 V Input Range, 1 mW 3-Channel 16-Bit, Sigma-Delta ADC |
| 中文描述： | 3-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | 0.300 INCH, SOIC-20 |
| 文件頁數： | 35/40頁 |
| 文件大小： | 316K |
| 代理商： | AD7707BR |
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REV. A
AD7707
–35–
Pressure Measurement
Other typical applications for the AD7707 include temperature
and pressure measurement. Figure 27 shows the AD7707 used
with a pressure transducer, the BP01 from Sensym. The
pressure transducer is arranged in a bridge network and gives a
differential output voltage between its OUT(+) and OUT(–)
terminals. With rated full-scale pressure (in this case 300mmHg)
on the transducer, the differential output voltage is 3mV/V of
the input voltage (i.e., the voltage between its IN(+) and IN(–)
terminals). Assuming a 5V excitation voltage, the full-scale
output range from the transducer is 15 mV. The low level input
channels are ideal for this type of low signal measurement appli-
cation. The excitation voltage for the bridge is also used to
generate the reference voltage for the AD7707. Therefore,
variations in the excitation voltage do not introduce errors in
the system. Choosing resistor values of 24 k
and 15 k
, as
per Figure 27, gives a 1.92 V reference voltage for the AD7707
when the excitation voltage is 5V.
Using the part with a programmed gain of 128 results in the
full-scale input span of the AD7707 being 15mV, which corre-
sponds with the output span from the transducer.
AD7707
DV
DD
+5V
REF IN(–)
AGND
MCLK IN
MCLK OUT
DRDY
REF IN(+)
24k
V
AV
DD
AIN1
LOCOM
DGND
OUT(–)
SCLK
DIN
DOUT
CS
CONTROLLER
15k
V
OUT(+)
EXCITATION VOLTAGE = +5V
IN(–)
IN(+)
Figure 27. Pressure Measurement Using the AD7707
Thermocouple Measurement
Another application area for the AD7707 is in temperature
measurement. Figure 28 outlines a connection from a thermo-
couple to the AD7707. In this application, the AD7707 is oper-
ated in its unbuffered mode to accommodate signals of
±
100 mV
on the front end. Cold conjunction compensation is imple-
mented using the AD590 temperature transducer that produces
an output current proportional to absolute temperature.
AD7707
DV
DD
+5V
AIN2
REF IN(–)
AGND
MCLK IN
MCLK OUT
DRDY
REF IN(+)
8.2k
V
CJC
AV
DD
AD590
+5V
AIN1
LOCOM
DGND
OUT
SCLK
DIN
DOUT
THERMOCOUPLE
JUNCTION
CS
CONTROLLER
REF192
+5V
GND
Figure 28. Thermocouple Measurement Using the
AD7707
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相關代理商/技術參數 |
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| AD7707BR-REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 500sps 16-bit Serial 20-Pin SOIC W T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 0.5KSPS 16BIT SERL 20SOIC W - Tape and Reel |
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| AD7707BRU | 功能描述:IC ADC 16BIT 3CH 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7707BRU-REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 500sps 16-bit Serial 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 0.5KSPS 16BIT SERL 20TSSOP - Tape and Reel |
| AD7707BRU-REEL7 | 功能描述:IC ADC 16BIT 3CH 20-TSSOP T/R RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 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) 輸入數目和類型:2 個單端，單極 |
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