AD7400A

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

Product Details

The is a second-order, Σ-Δ modulator that converts an analog input signal into a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc., _i_Coupler® technology. The AD7400A operates from a 5 V power supply and accepts a differential input signal of ±250 mV ±320 mV full scale. The analog input is sampled continuously 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 and has an operating temperature range of −40°C to +125°C. The AD7400A is offered in an 8-lead surface-mount PDIP with gull wing leads and a 16-lead SOIC package.

**Applications**

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AC motor controls

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Shunt current monitoring

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Data acquisition systems

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Analog-to-digital and 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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1.5 μV/°C typical offset drift

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On-board digital isolator

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8-lead surface-mount PDIP package with gull wing leads and 16-lead SOIC package

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See Data Sheet for Additional Information