AD7400YRWZ-REEL

隔离式Σ-Δ调制器 Isolated Sigma-Delta Modulator

Product Details

The AD7400 is a second-order, sigma-delta Σ-Δ modulator that converts an analog input signal to a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc. _i_Coupler® technology. The AD7400 operates from a 5 V power supply and accepts a differential input signal of ±200 mV ±320 mV full scale. The analog input is continuously sampled by the analog modulator, eliminating the need for external sample-and-hold circuitry. The input information is contained in the output stream as a density of ones with a data rate of 10 MHz. The original information can be reconstructed with an appropriate digital filter. The serial I/O can use a 5 V or a 3 V supply VDD2.

The serial interface is digitally isolated. High speed CMOS, combined with monolithic air core transformer technology, means the on-chip isolation provides outstanding performance characteristics superior to alternatives such as optocoupler devices. The part contains an on-chip reference. The AD7400 is offered in a 16-lead SOIC and has an operating temperature range of −40°C to +105°C.

An external clock version, AD7401, is also available.

**Applications**

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AC motor controls

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Data acquisition systems

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A/D + opto-isolator replacements

### Features and Benefits

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10 MHz clock rate 

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Second-order modulator 

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16 bits no missing codes 

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±2 LSB INL typical at 16 bits 

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3.5 μV/°C maximum offset drift 

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On-board digital isolator 

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On-board reference 

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Low power operation: 18 mA maximum at 5.25 V 

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−40°C to +105°C operating range

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16-lead SOIC package

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See attached Data Sheet for more Features.