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參數資料
| 型號： | AD7731EB |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision, Zero-Drift Instrumentation Amplifier; Package: SO; No of Pins: 16; Temperature Range: 0°C to +70°C |
| 中文描述： | 低噪聲高通量24位Σ-Δ模數轉換器（411.99十一） |
| 文件頁數： | 39/44頁 |
| 文件大小： | 411K |
| 代理商： | AD7731EB |
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AD7731
–39–
REV. 0
APPLIC AT IONS
T he on-chip PGA allows the AD7731 to handle analog input
voltage ranges from 20 mV to 1.28 V. T his makes the AD7731
suitable for a range of application areas from handling signals
directly from a transducer to processing fully-conditioned full-
scale inputs. Some of these applications are discussed in the
following sections.
T he AD7731 offers both unipolar and bipolar input ranges. In
many cases, the application is single supply with the bipolar
input voltages referenced to a biased-up differential voltage.
Some applications will, however, require the flexibility of han-
dling true bipolar inputs. Figure 25 shows how to configure the
AD7731 to handle this type of signal.
It should be noted in multiplexed applications that an input
overvoltage (either >AVDD + 0.3 V or <AGND – 0.3 V) on an
unselected channel can affect the conversion result on the se-
lected channel. T he system design should ensure that the input
voltage on channels where input leads may be unconnected or
broken be kept within the above limits.
T he AD7731 has a variety of different modes aimed at optimiz-
ing the AD7731’s performance across differing application require-
ments. T he issue of filtering and settling time and throughput rates
in multichannel applications has previously been discussed in the
Filter Architecture section.
Data Acquisition
T he AD7731 with its three differential channels (or five pseudo-
differential channels) is suited to low bandwidth, high resolution
data acquisition systems. In addition, the three-wire digital
interface allows this data acquisition front end to be isolated
with just three optoisolators. T he entire system can be operated
from a single +5 V supply provided that the input signals to the
AD7731’s analog inputs are all of positive polarity. Figure 21
shows the AD7731 in an isolated three-channel data acquisition
system.
Programmable Logic Controllers
T he AD7731 is also suited to programmable logic controller
applications. In such applications, the ADC is required to
handle signals from a variety of different transducers. T he
AD7731’s programmable gain front end allows the part to either
handle low level signals directly from a transducer or full-scale
signals which have already been conditioned. T he fast through-
put rate and settling-time of the part is also an important feature
in these applications where loop response time is often critical.
T he configuration of the AD7731 in PLC applications is similar
to that outlined in Figure 21 for the data acquisition system.
SIGMA-
DELTA
MODULATOR
CLOCK
GENERATION
AD7731
SERIAL INTERFACE
AND CONTROL LOGIC
REGISTER BANK
DIGITAL
FILTER
SIGMA-DELTA A/D
CONVERTER
BUFFER
PGA
STANDBY
SYNC
MCLK IN
MCLK OUT
SCLK
CS
DIN
DOUT
RESET
RDY
POL
DGND
+5V
S
M
100nA
AGND
100nA
AV
DD
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
MICROCONTROLLER
OPTO-ISOLATORS
AGND
REF IN (–)
REF IN (+)
AD780
+5V
V
OUT
GND
+V
IN
IN1+
IN1–
IN2+
IN2–
IN3+
IN3–
AV
DD
DV
DD
Figure 21. Data Acquisition Using the AD7731
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相關代理商/技術參數 |
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| AD7732 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2-Channel, +-10 V Input Range, High Throughput, 24-Bit SIGMA- ADC |
| AD7732BRU | 功能描述:IC ADC 24BIT 2-CH 28-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 |
| AD7732BRU-REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 15.437ksps 24-bit Serial 28-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 15.437KSPS 24BIT SERL 28TSSOP - Tape and Reel |
| AD7732BRU-REEL7 | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 15.437ksps 24-bit Serial 28-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 15.437KSPS 24BIT SERL 28TSSOP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:2 DIFF CH :10V INPUT, 28-BIT SD ADC - Tape and Reel |
| AD7732BRUZ | 功能描述:IC ADC 24BIT 2-CH 28-TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 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 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
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