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AD8021 数据表(PDF) 25 Page - Analog Devices

部件名 AD8021
功能描述  16-Bit, 250 kSPS PulSAR ADC in MSOP/QFN
PDF  28 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8021 数据表(HTML) 25 Page - Analog Devices

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AD7685
Rev. C | Page 25 of 28
TRUE 16-BIT ISOLATED APPLICATION EXAMPLE
In applications where high accuracy and isolation are required,
for example, power monitoring, motor control, and some
medical equipment, the circuit given in Figure 48, using the
AD7685 and the ADuM1402C digital isolator, provides a
compact and high performance solution.
Multiple AD7685s are daisy-chained to reduce the number of
signals to isolate. Note that the SCKOUT, which is a readback of
the AD7685’s clock, has a very short skew with the DATA
signal. This skew is the channel-to-channel matching
propagation delay of the digital isolator (tPSKCD). This allows
running the serial interface at the maximum speed of the digital
isolator (45 Mbps for the ADuM1402C), which would have
been otherwise limited by the cascade of the propagation delays
of the digital isolator.
The complete analog chain runs on a 5 V single supply using
the ADR391 low dropout reference voltage and the rail-to-rail
CMOS AD8618 amplifier while offering true bipolar input range.
IN– GND
REF VDD VIOSDO
VDD1, VE1
GND1
VDD2, VE2
GND2
SCK
CNV
SDI
AD7685
1/4 AD8618
5V
1kΩ
2V REF
±10V INPUT
5V REF
5V
5V
10µF
100nF
100nF
IN– GND
REF VDD VIOSDO
SCK
CNV
SDI
AD7685
1/4 AD8618
5V
1kΩ
2V REF
±10V INPUT
5V REF
5V
10µF
100nF
IN– GND
REF VDD VIOSDO
SCK
CNV
SDI
AD7685
1/4 AD8618
5V
1kΩ
2V REF
±10V INPUT
5V REF
5V
10µF
100nF
IN–
IN+
IN+
IN+
IN+
GND
REF VDD VIOSDO
SCK
CNV
SDI
AD7685
1/4 AD8618
5V
1kΩ
4kΩ
4kΩ
4kΩ
4kΩ
2V REF
5V
5V
1kΩ
1kΩ
1kΩ
100nF
10µF
5V REF
2V REF
4kΩ
±10V INPUT
5V REF
5V
10µF
100nF
VIA
VIB
VOC
VOD
VOA
VOB
VIC
VID
2.7V TO 5V
100nF
DATA
SCKOUT
SCKIN
CONVERT
ADuM1402C
OUT
GND
IN
ADR391
Figure 48. A True 16-Bit Isolated Simultaneous Sampling Acquisition System



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