GENERAL DESCRIPTION
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.

FEATURES
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
On-board reference
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 package
Safety and regulatory approvals
UL recognition
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

APPLICATIONS
Shunt current monitoring
AC motor controls
Power and solar inverters
Wind turbine inverters
Data acquisition systems
Analog-to-digital and opto-isolator replacements