AMC1200SDUB Precision Isolated Delta-Sigma Modulator with ±250mV Input 5V Operation 20MHz Clock 78dB SNR High CMTI -40°C to 125°C SOIC-8 Safety Certification

Features

• ±250-mV Input Voltage Range Optimized for 1 Shunt Resistors

• Very Low Nonlinearity: 0.075% Maximum at 5 V

• LowOffset Error: 1.5 mV Maximum

• LowNoise: 3.1 mVRMS Typical

• LowHigh-Side Supply Current: 8 mAMaximum at 5 V

• Input Bandwidth: 60 kHz Minimum

• Fixed Gain: 8 (0.5% accuracy)

• High Common Mode Rejection Ratio: 108 dB

• 3.3-V Operation on Low-Side

• Certified Galvanic Isolation:

– UL1577 and VDE V 0884-10 Approved

– Isolation Voltage: 4250 VPEAK (AMC1200B)

– Working Voltage: 1200 VPEAK

– Transient Immunity: 10 kV/µs Minimum

• Typical 10-Year Lifespan at Rated Working Voltage (see Application Report SLLA197)

• Fully Specified Over the Extended Industrial Temperature Range

Applications

• Shunt Resistor Based Current Sensing in:

– Motor Control

– Green Energy

– Frequency Inverters

– Uninterruptible Power Supp

Description

The AMC1200 and AMC1200B are precision isolation amplifiers with an output separated from the input circuitry by a silicon dioxide (SiO2) barrier that is highly resistant to magnetic interference. This barrier has been certified to provide galvanic isolation of up to 4250 VPEAK (AMC1200B) or 4000 VPEAK (AMC1200) according to UL1577 and VDE V 0884 10. Used in conjunction with isolated power supplies, these devices prevent noise currents on a high common mode voltage line from entering the local ground and interfering with or damaging sensitive circuitry.

The input of the AMC1200 or AMC1200B is optimized for direct connection to shunt resistors or other low voltage level signal sources. The excellent performance of the device supports accurate current control resulting in system-level power saving and, especially in motor-control applications, lower torque ripple. The common mode voltage of the output signal is automatically adjusted to either the 3-V or 5-V low-side supply.

The AMC1200 and AMC1200B are fully specified over the extended industrial temperature range of–40°C to 105°C and are available in a wide-body SOIC-8 package (DWV) and a gullwing-8 package (DUB).

INFORMATION

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