16-Bit, Isolated,
Sigma-Delta Modulator
ADuM7702
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAM
V
V
DD2
DD1
5 MHz to 21 MHz master clock input frequency
Offset drift vs. temperature: 0.25 µV/°C
SNR: 82 dB typical
ADuM7702
CLK
DECODER
CLK
ENCODER
MCLKIN
MDAT
16 bits, no missing codes
Full-scale analog input voltage range: 64 mV
ENOB: 13 bits typical
V
V
IN+
DATA
ENCODER
DATA
DECODER
GAIN
I
DD1: 10 mA maximum
Σ-Δ ADC
IN–
On-board digital isolator
Operating temperature range: −40°C to +125°C
High isolation common-mode transient immunity:
150 kV/µs minimum, VDD2 = 3.3 V
Wide-body SOICs
GND
GND
2
1
Figure 1.
16-lead SOIC_W
8-lead SOIC_IC with increased creepage
Safety and regulatory approvals
UL recognition
5700 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice 5A
VDE Certificate of Conformity
DIN V VDE V 0884-10: VIORM = 1270 VPEAK
DIN V VDE V 0884-11: VIORM = 1060 VPEAK (pending)
APPLICATIONS
Shunt current monitoring
AC motor controls
Power and solar inverters
Wind turbine inverters
Analog-to-digital and optoisolator replacement
GENERAL DESCRIPTION
The ADuM7702 is a high performance, second-order, Σ-Δ
modulator that converts an analog input signal to a high speed,
single-bit data stream, with on-chip digital isolation based on
Analog Devices, Inc., iCoupler® technology. The device operates
from a 4.5 V to 5.5 V power supply range (VDD1) and accepts a
pseudo differential input signal of 50 mV ( 64 mV full-scale).
The pseudo differential input is ideally suited to shunt voltage
monitoring in high voltage applications where galvanic isolation
is required.
The analog input is continuously sampled by a high performance
analog modulator and converted to a ones density digital output
stream with a data rate of up to 21 MHz. The original information
can be reconstructed with an appropriate sinc3 digital filter to
achieve an 82 dB signal-to-noise ratio (SNR) at 78.1 kSPS with a
256 decimation rate and a 20 MHz master clock. The serial input
and output operates from a 5 V or a 3 V supply (VDD2).
The serial interface is digitally isolated. High speed complementary
metal-oxide semiconductor (CMOS) technology, combined with
monolithic transformer technology, results in on-chip isolation
providing outstanding performance characteristics, superior to
alternatives such as optocoupler devices. The ADuM7702 is
available in both a 16-lead SOIC_W and an 8-lead SOIC_IC
and has an operating temperature range of −40°C to +125°C.
Rev. 0
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Trademarks and registeredtrademarks are theproperty of their respective owners.
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Tel: 781.329.4700
Technical Support
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www.analog.com
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