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| 型號(hào)： | AD7715AN-5 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 30/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 5V 16-DIP |
| 標(biāo)準(zhǔn)包裝： | 25 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 500 |
| 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）： | 9.5mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 16-PDIP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個(gè)差分，單極；1 個(gè)差分，雙極 |
| 配用： | EVAL-AD7715-3EBZ-ND - BOARD EVALUATION FOR AD7715 |
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AD7715
Rev. D | Page 36 of 40
APPLICATIONS INFORMATION
The AD7715 provides a low cost, high resolution analog-to-
digital function. Because the analog-to-digital function is
provided by a Σ-Δ architecture, it makes the part more immune
to noisy environments thus making the part ideal for use in
industrial and process control applications. It also provides a
programmable gain amplifier, a digital filter and calibration
options. Thus, it provides far more system level functionality
than off-the-shelf integrating ADCs without the disadvantage
of having to supply a high quality integrating capacitor. In
addition, using the AD7715 in a system allows the system
designer to achieve a much higher level of resolution because
noise performance of the AD7715 is significantly better than
that of the integrating ADCs.
The on-chip PGA allows the AD7715 to handle an analog input
voltage range as low as 10 mV full-scale with VREF = 1.25 V. The
differential inputs of the part allow this analog input range to
have an absolute value anywhere between AGND and AVDD
to connect the transducer directly to the input of the AD7715.
The programmable gain front end on the AD7715 allows the
part to handle unipolar analog input ranges from 0 mV to
20 mV to 0 V to 2.5 V and bipolar inputs of ±20 mV to
±2.5 V. Because the part operates from a single supply, these
bipolar ranges are with respect to a biased-up differential input.
PRESSURE MEASUREMENT
One typical application of the AD7715 is pressure measurement.
Figure 14 shows the AD7715 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 300 mmHg) on the transducer, the differential
output voltage is 3 mV/V of the input voltage (that is, the
voltage between its 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 is also used to generate the reference voltage for the
AD7715. Therefore, variations in the excitation voltage do not
introduce errors in the system. Choosing resistor values of 24 kΩ
and 15 kΩ as per the diagram give a 1.92 V reference voltage for
the AD7715 when the excitation voltage is 5 V.
Using the part with a programmed gain of 128 results in the
full-scale input span of the AD7715 being 15 mV which
corresponds with the output span from the transducer.
IN(–)
OUT(+)
IN(+)
OUT(–)
AUTO-ZEROED
Σ-
MODULATOR
CHARGE BALANCING ADC
DIGITAL
FILTER
AVDD
SERIAL INTERFACE
REGISTER BANK
MCLK IN
MCLK OUT
REF IN(+)
REF IN(–)
AGND
DGND
DOUT
DIN
CS
SCLK
DRDY
RESET
24k
15k
DVDD
AD7715
+5V
EXCITATION VOLTAGE = +5V
AIN(+)
AIN(–)
A = 1 TO 128
PGA
BUFFER
CLOCK
GENERATION
08
51
9-
01
4
Figure 14. Pressure Measurement Using the AD7715
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| AD7715ANZ-3 | 功能描述:IC ADC 16BIT SIGMA-DELTA 16DIP 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(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)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(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個(gè)單端，單極；1 個(gè)單端，雙極 |
| AD7715ANZ-31 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 450 ??A 16-Bit, Sigma-Delta ADC |
| AD7715ANZ-5 | 功能描述:IC ADC 16BIT 5V 16-DIP 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(biāo)準(zhǔn)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(gè)單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7715ANZ-5 | 制造商:Analog Devices 功能描述:A/D Converter (A-D) IC |
| AD7715ANZ-51 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 450 ??A 16-Bit, Sigma-Delta ADC |
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