參數(shù)資料
型號(hào)： AD7731BR-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 33/44頁(yè)
文件大?。?/td> 0K
描述： IC ADC 24BIT SIGMA-DELTA 24-SOIC
標(biāo)準(zhǔn)包裝： 1,000
位數(shù)： 24
采樣率（每秒）： 6.4k
數(shù)據(jù)接口： DSP，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 125mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類(lèi)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 W
包裝： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 3 個(gè)差分，單極；3 個(gè)差分，雙極；5 個(gè)偽差分，單極；5 個(gè)偽差分，雙極
配用： EVAL-AD7731EBZ-ND - BOARD EVALUATION FOR AD7731
AD7731
–39–
REV. 0
APPLICATIONS
The on-chip PGA allows the AD7731 to handle analog input
voltage ranges from 20 mV to 1.28 V. This 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.
The 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. The system design should ensure that the input
voltage on channels where input leads may be unconnected or
broken be kept within the above limits.
The AD7731 has a variety of different modes aimed at optimiz-
ing the AD7731’s performance across differing application require-
ments. The issue of filtering and settling time and throughput rates
in multichannel applications has previously been discussed in the
Data Acquisition
The 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. The 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
The 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. The
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. The 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.
The 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
SWITCHING
MATRIX
100nA
AGND
100nA
AVDD
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
MICROCONTROLLER
OPTO-ISOLATORS
AGND
REF IN (–)
REF IN (+)
AD780
+5V
VOUT
GND
+VIN
IN1+
IN1–
IN2+
IN2–
IN3+
IN3–
AVDD
DVDD
Figure 21. Data Acquisition Using the AD7731
REV. A
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