16-Bit, Isolated,

Sigma-Delta ADC

Data Sheet

ADuM7703

Rev. A

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

©2019 Analog Devices, Inc. All rights reserved.

Technical Support

www.analog.com

FEATURES

5 MHz to 21 MHz master clock input frequency

Offset drift vs. temperature: ±0.6 μV/°C maximum

SNR: 86 dB typical

16 bits, no missing codes

Full-scale analog input voltage range: ±320 mV

ENOB: 14 bits typical

On-board digital isolator

Operating temperature range

−40°C to +125°C (16-lead SOIC_W)

−40°C to +105°C (8-lead SOIC_IC)

Wide-body SOICs

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 (Pending)

VDE Certificate of Conformity

APPLICATIONS

Shunt current monitoring

AC motor controls

Power and solar inverters

Wind turbine inverters

Analog-to-digital and optoisolator replacement

FUNCTIONAL BLOCK DIAGRAM

ADuM7703

MCLKIN

MDAT

DATA

DECODER

CLK

ENCODER

DATA

ENCODER

Σ-∆ ADC

GAIN

CLK

DECODER

LDO

Figure 1.

GENERAL DESCRIPTION

The ADuM7703 is a high performance, second-order, Σ-Δ analog-

to-digital converter (ADC) with an integrated low dropout

(LDO) regulator 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

and accepts a pseudo differential input signal of ±250 mV

(±320 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 86 dB signal-to-noise ratio (SNR) at 78.1 kSPS with a

256 decimation rate and a 20 MHz master clock. The serial

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 ADuM7703 device

is available in a 16-lead, wide-body SOIC with an operating

temperature range of −40°C to +125°C and an 8-lead, wide-body

SOIC with an operating temperature range of −40°C to +105°C.