16-Bit, Isolated Sigma-Delta Modulator,
5 MHz to 20 MHz external clock input rate
16 bits, no missing codes
Signal-to-noise ratio (SNR): 88 dB typical
Effective number of bits (ENOB): 14.2 bits typical
Typical offset drift vs. temperature: 1.6 µV/°C
Low voltage differential signaling (LVDS) interface
On-board digital isolator
Full-scale analog input voltage range: ±320 mV
−40°C to + 125°C operating temperature range
High common-mode transient immunity: >25 kV/µs
16-lead, wide-body SOIC_IC, with increased creepage
Safety and regulatory approvals
5000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice 5A
VDE Certificate of Conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
Maximum working insulation voltage (VIORM): 1250 VPEAK
Shunt current monitoring
AC motor controls
Power and solar inverters
Wind turbine inverters
Data acquisition systems
Analog-to-digital and opto-isolator replacements
FUNCTIONAL BLOCK DIAGRAM
The AD74051 is a high performance, second-order, Σ-Δ modulator
that converts an analog input signal into a high speed, single-bit
LVDS data stream, with on-chip digital isolation based on
Analog Devices, Inc., iCoupler® technology. The AD7405 operates
from a 4.5 V to 5.5 V (VDD1) power supply and accepts a
differential input signal of ±250 mV (±320 mV full-scale). The
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 20 MHz. The original information
can be reconstructed with an appropriate digital filter to achieve
88 dB SNR at 78.1 kSPS. The LVDS input/output can use a 3 V
to 5.5 V supply (VDD2).
The LVDS interface is digitally isolated. The LVDS interface
technology, combined with monolithic transformer technology,
means the on-chip isolation provides outstanding performance
characteristics, superior to alternatives such as optocoupler
devices. The AD7405 device is offered in a 16-lead, wide-body
SOIC_IC package and has an operating temperature range of
−40°C to +125°C.
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
©2014 Analog Devices, Inc. All rights reserved.