16-Bit, Isolated,
Sigma-Delta Modulator
ADuM7701
Data Sheet
FEATURES
FUN°TIONAL BLO°K DIAGRAM
V
V
DD2
DD1
5 MHz to 21 MHz master clock input frequency
Offset drift vs. temperature: 0.6 ꢀμV/° maximum
SNR: 86 dB typical
ADuM7701
CLK
DECODER
CLK
ENCODER
MCLKIN
MDAT
16 bits, no missing codes
Full-scale analog input voltage range: 320 mμ
ENOB: 14 bits typical
V
V
IN+
DATA
ENCODER
DATA
DECODER
I
DD1: 10 mA maximum
GAIN
Σ-Δ ADC
IN–
On-board digital isolator
Operating temperature range: −40/° to +125/°
High common-mode transient immunity: 150 kμVꢀs minimum,
GND
GND
2
1
μDD2 = 3.3 μ
Figure 1.
Wide-body SOI°s
16-lead SOI°_W
8-lead SOI°_I° with increased creepage
Safety and regulatory approvals (pending)
UL recognition
5700 μ rms for 1 minute per UL 1577
°SA °omponent Acceptance Notice 5A
μDE °ertificate of °onformity
DIN μ μDE μ 0884-10: μIORM = 1270 μPEAK
DIN μ μDE μ 0884-11: μIORM = 1060 μPEAK
APPLI°ATIONS
Shunt current monitoring
A° motor controls
Power and solar inverters
Wind turbine inverters
Analog-to-digital and optoisolator replacement
GENERAL DES°RIPTION
The ADuM7701 is a high performance, second-order, Σ-Δ
modulator that converts an analog input signal into 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 (±ꢀ±0 mV full-scale). The pseudo differential input
is ideally suited to shunt voltage monitoring in high voltage
applications where galvanic isolation is required.
can be reconstructed with an appropriate sincꢀ digital filter to
achieve an 86 dB signal-to-noise ratio (SNR) at 78.1 kSPS with a
±56 decimation rate and a ±0 MHz master clock. The serial
input and output operates from a 5 V or a ꢀ V supply (VDD±).
The serial interface is digitally isolated. High speed complementary
metal-oxide semiconductor (CMOS) technology, combined with
monolithic transformer technology, results in the on-chip
isolation providing outstanding performance characteristics,
superior to alternatives such as optocoupler devices. The
ADuM7701 device is available in both a 16-lead and an 8-lead
wide-body SOIC and has an operating temperature range of
−40°C to +1±5°C.
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 ±1 MHz. The original information
Rev. 0
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Trademarks and registeredtrademarks are theproperty of their respective owners.
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Technical Support
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www.analog.com
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