ACPL-C740-000E

Overview

The Broadcom ACPL-C740-000E is a one-bit, second-order sigma-delta modulator that converts analog input signals into high-speed digital data streams using optical coupling technology. It features an internal 20 MHz clock and operates on a single 5 V supply. The device provides a differential input range of ±200 mV (full scale ±320 mV), suitable for direct connection to shunt resistors. With a dynamic range of 86 dB and 16-bit resolution (12-bit ENOB), it offers low offset drift of 1 μV/°C and gain error of ±1%. The component utilizes a serial interface with a wide power range of 3 V to 5.5 V for data and clock transmission.

Feature Summary

• Optically isolated sigma-delta modulator with 20 MHz internal clock
• High isolation performance: 25 kV/μs common-mode transient immunity
• 16-bit resolution with 86 dB dynamic range and no missing codes
• SSO-8 package with reinforced insulation and UL/CSA certifications

Applications

• Servo drives and motor control systems
• Motor phase and supply rail current detection
• Power inverter current sensing
• Industrial process control systems
• General-purpose current sensing applications

Procurement Notes

Verify the specific suffix code when ordering, as variants such as ACPL-C740-500E exist with identical functional specifications but potentially different packaging or reel configurations. Confirm regulatory compliance requirements against the datasheet ratings for your specific region. Ensure the design supports the required 3 V to 5.5 V logic levels for the digital interface. Check for updated safety certification documents from Broadcom if operating in regulated industries.

Selection Notes

Select this component when high-speed, isolated current measurement is required without traditional current transformers. The ±200 mV input range is optimized for low-side shunt sensing. Ensure the downstream digital filter can handle the 20 MHz bitstream to reconstruct the signal within the specified 86 dB dynamic range. Verify that the system voltage aligns with the 5 V analog supply requirement while accommodating the 3 V to 5.5 V digital interface range.

Part Context

The ACPL-C740 series belongs to Broadcom's portfolio of optically isolated signal chain components designed for robust industrial environments. It replaces conventional current transmitters by integrating modulation and isolation in a compact SSO-8 package. This approach reduces component count and size while providing superior noise immunity compared to capacitive or magnetic isolation technologies.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other Broadcom isolated modulators or comparable sigma-delta devices only after verifying pin compatibility, electrical parameters, and isolation voltage ratings against the ACPL-C740 specifications.

FAQ

What is the maximum common-mode transient immunity of the ACPL-C740?

The device provides a common-mode transient immunity of 25 kV/μs, ensuring reliable operation in high-noise environments.

What is the input voltage range for the ACPL-C740?

The linear input range is ±200 mV differential, with a full-scale range of ±320 mV, making it suitable for direct shunt resistor connections.

Does the ACPL-C740 have missing codes?

No, the device guarantees 16-bit resolution with no missing codes over the specified temperature range.