Modulator : AD7403

Power supply, Converter, Regulator

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Presentation

The AD740x 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 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 signal to noise ratio (SNR) at 78.1 kSPS.

Technical 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 typical Avialable with LVDS interface On-board digital isolator On-board reference Full-scale analog input range: ±320 mV −40° C to + 125° C operating range High common-mode transient immunity: >25 kV/μs 16-lead, wide-body SOIC, with increased creepage package

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