AD7686BRMZ Analog Devices Inc, AD7686BRMZ Datasheet - Page 24

• Manufacturer Part Number: AD7686BRMZ
• Description: IC ADC 16BIT 500KSPS 10-MSOP
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of AD7686BRMZ

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Bits: 16
• Sampling Rate (per Second): 500k
• Number Of Converters: 1
• Power Dissipation (max): 21.5mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP (0.118", 3.00mm Width)
• Resolution (bits): 16bit
• Input Channel Type: Pseudo Differential
• Supply Voltage Range - Analogue: 4.5V To 5.5V
• Supply Voltage Range - Digital: 1.8V To 5.8V, 2.3V To 5.8V
• Sampling Rate: 500kSPS
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7686CBZ - BOARD EVALUATION FOR AD7686
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AD7686
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 47, using the AD7686 and the
ADuM1402C digital isolator, provides a compact and high
performance solution.
Multiple AD7686s are daisy-chained to reduce the number of signals
to isolate. Note that the SCKOUT, which is a readback of the
AD7686’s clock, has a very short skew with the DATA signal. This
skew is the channel-to-channel matching propagation delay of the
±10V INPUT
±10V INPUT
±10V INPUT
±10V INPUT
2V REF
2V REF
2V REF
2V REF
4kΩ
4kΩ
4kΩ
4kΩ
1/4 AD8618
1/4 AD8618
1/4 AD8618
1/4 AD8618
1kΩ
1kΩ
1kΩ
1kΩ
5V
5V
5V
5V
5V REF
5V REF
5V REF
5V REF
Figure 47. A True 16-Bit Isolated Simultaneous Sampling Acquisition System
10µF
10µF
10µF
10µF
IN+
IN+
IN+
IN+
REF VDD VIO
REF VDD VIO
REF VDD VIO
REF VDD VIO
IN– GND
IN– GND
IN– GND
IN–
GND
AD7686
AD7686
AD7686
AD7686
100nF
100nF
100nF
100nF
Rev 0 | Page 24 of 28
5V
5V
5V
5V
SCK
CNV
SCK
CNV
SCK
CNV
SCK
CNV
SDO
SDO
SDO
SDO
SDI
SDI
SDI
SDI
digital isolator (t
interface at the maximum speed of the digital isolator
(45 Mbits/s for the ADuM1402C), which would have been
otherwise limited by the cascade of the propagation delays of
the digital isolator. For instance, four AD7686s running at
330 kSPS can be chained together.
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.
100nF
5V
5V
IN
ADR391
GND
VOC
VOD
V
GND
VIA
VIB
DD1
OUT
1kΩ
1
, V
PSKCD
E1
ADuM1402C
10µF
). This allows running the serial
1kΩ
1kΩ
5V
100nF
V
DD2
GND
4kΩ
, V
VOA
VOB
VIC
VID
5V REF
E2
2V REF
2
DATA
SCKOUT
SCKIN
CONVERT
100nF
2.7V TO 5V