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AD7680 Datasheet(PDF) 24 Page - Analog Devices

Part # AD7680
Description  16-Bit, 500 kSPS PulSAR ADC in MSOP/QFN
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7680 Datasheet(HTML) 24 Page - Analog Devices

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AD7686
Rev. B | Page 24 of 28
TRUE 16-BIT ISOLATED APPLICATION EXAMPLE
In applications where high accuracy and isolation are required,
such as power monitoring, motor control, and some medical
equipment, the circuit shown in Figure 47, using the AD7686
and the ADuM1402C digital isolator, provides a compact and
high performance solution.
Multiple AD7686 devices are daisy-chained to reduce the
number of signals to isolate. Note that the SCKOUT, which is a
readback of the AD7686 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. For instance, four AD7686 devices running
at 330 kSPS can be chained together.
The complete analog chain runs on a single 5 V 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 VIO
SDO
VDD1, VE1
GND1
VDD2, VE2
GND2
SCK
CNV
SDI
AD7686
1/4 AD8618
5V
1kΩ
2V REF
±10V INPUT
5V REF
5V
5V
10µF
100nF
100nF
IN– GND
REF VDD VIO
SDO
SCK
CNV
SDI
AD7686
1/4 AD8618
5V
1kΩ
2V REF
±10V INPUT
5V REF
5V
10µF
100nF
IN– GND
REF VDD VIO
SDO
SCK
CNV
SDI
AD7686
1/4 AD8618
5V
1kΩ
2V REF
±10V INPUT
5V REF
5V
10µF
100nF
IN–
IN+
IN+
IN+
IN+
GND
REF VDD VIO
SDO
SCK
CNV
SDI
AD7686
1/4 AD8618
5V
1kΩ
4kΩ
4kΩ
4kΩ
4kΩ
2V REF
5V
5V
1kΩ
1kΩ
1kΩ
100nF
10
μF
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 47. A True 16-Bit Isolated Simultaneous Sampling Acquisition System



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