AMC1203

1 位 10MHz 2 阶隔离式 Δ-Σ 调制器

The is a 1-bit, 10MHz, isolated delta-sigma ΔΣ modulator with an output buffer separated from the input interface circuitry by a silicon dioxide SiO2 isolation barrier. This barrier provides galvanic isolation of up to 4000VPEAK. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry.

The AMC1203 modulator operates from a +5V supply with a dynamic range of 95dB. The differential inputs are ideal for direct connection to shunt resistors or other low-level signal sources. With the appropriate digital filter and modulator rate, the device can be used to achieve 16-bit analog-to-digital A/D conversion with no missing codes. An effective resolution of 14 bits and an SNR of 85dB typical can be maintained with a sinc3 filter with a decimation ratio of 256.

The modulator output is translated to a balanced signal and then transferred by the capacitive isolation barrier. Across the isolation barrier, a differential comparator receives the logic transition information, and then sets or resets a flip-flop and the output circuit accordingly.

The AMC1203 is available in SOP-8 gull-wing, SOP-8, and SOIC-16 packages. The AMC1203 is characterized for operation over the ambient temperature range of –40°C to +105°C.

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16-Bit Resolution

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SNR: 80.5dB min

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THD: –88dB max AMC1203B

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±280mV Input Range with +5V Supply

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Internal 2.5V Reference Voltage: 1% Accuracy

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Gain Error: ±1% AMC1203B

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UL1577, IEC60747-5-2 VDE0884, Rev. 2, and IEC61010-1 Approved

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Isolation: 4000VPEAK,

Working Voltage: 560V

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Transient Immunity: 15kV/µs

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Typical 25-Year Life at Rated Working Voltage

see Application Report SLLA197

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Specified Temperature Range:

–40°C to +105°C

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APPLICA ONS

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Shunt Based Current Sensing in:

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Motor Control

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Uninterruptible Power Supplies

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Power Inverters

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Industrial Process Control

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