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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