16-Bit, Isolated,
Sigma-Delta ADC
ADuM7703
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
16 bits, no missing codes
Full-scale analog input voltage range: 320 mμ
ENOB: 14 bits typical
ADuM7703
CLK
CLK
MCLKIN
MDAT
DECODER
ENCODER
V
IN+
DATA
ENCODER
DATA
DECODER
I
DD1: 10 mA maximum
GAIN
GND
Σ-∆ ADC
V
IN–
On-board digital isolator
Operating temperature range
−40/° to +125/° (16-lead SOI°_W)
−40/° to +105/° (8-lead SOI°_I°)
20 μ operation on μDD1
GND
1
2
Figure 1.
High °MTI: 150 kμVꢀs minimum, μDD2 = 3.3 μ
Wide-body SOI°s
16-lead SOI°_W
8-lead SOI°_I° with increased creepage
Safety and regulatory approvals
UL recognition
5700 μ rms for 1 minute per UL 1577
°SA °omponent Acceptance Notice 5A (Pending)
μDE °ertificate of °onformity
DIN μ μDE μ 0884-10: μIORM = 1270 μPEAK
DIN μ μDE μ 0884-11: μIORM = 1060 μPEAK (Pending)
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 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
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
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 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.
device operates from a 4.5 V to 20 V power supply range (VDD1
)
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
Rev. 0
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www.analog.com
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