16-Bit, Isolated,
Sigma-Delta Modulator
Data Sheet
ADuM7704
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 maximum
SNR: 82 dB typical
ADuM7704
LDO
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
Σ-Δ ADC
I
DD1: 10 mA maximum
IN–
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)
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 ADuM7704 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 20 V power supply range (VDD1
and accepts a pseudo differential input signal of ±50 mV
(±±4 mV full-scale). The pseudo differential input is ideally
suited to shunt voltage monitoring in high voltage applications
where galvanic isolation is required.
achieve an 82 dB signal-to-noise ratio (SNR) at 78.1 kSPS with a
25± decimation rate and a 20 MHz master clock. The serial input
and output operates from a 5 V or a 3.3 V supply (VDD2).
The serial interface is digitally isolated. High speed complementary
metal-oxide semiconductor (CMOS) technology, combined with
monolithic transformer technology, results in the on-chip
isolation providing outstanding performance characteristics,
superior to alternatives such as optocoupler devices. The
ADuM7704 is available in a 1±-lead, wide-body SOIC_W with
an operating temperature range of −40°C to +125°C and an 8-lead,
wide-body SOIC_IC with an operating temperature range of
−40°C to +105°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 21 MHz. The original information
can be reconstructed with an appropriate sinc3 digital filter to
Rev. 0
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rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property 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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