Optically Isolated Sigma Delta Modulator Broadcom HCPL 7860 500E for Motor Phase Current Measurement

Product Overview

The HCPL-7860/HCPL-786J Optically Isolated Modulator, when paired with the HCPL-0872 Digital Interface IC or a digital filter, forms a two-chip isolated programmable analog-to-digital converter. This system enables direct measurement of motor phase currents in power inverters by converting a low-bandwidth analog input into a high-speed one-bit data stream via Sigma-Delta modulation. Key advantages include high noise margins, excellent immunity against isolation-mode transients, and a 200 mV input range with a single 5V supply. Applications span motor phase and rail current sensing, data acquisition systems, industrial process control, and general-purpose current sensing.

Product Attributes

• Brand: Avago Technologies
• Certifications: UL 1577, CSA, IEC/EN/DIN EN 60747-5-5
• Compliance: Lead (Pb) Free, RoHS 6 fully compliant options available
• Handling: Static precautions advised due to ESD sensitivity
• Exclusion: Not for military or aerospace applications

Technical Specifications

Model	Description	Key Features	Input Range	Supply Voltage	Conversion Time	Effective Resolution	Isolation Transient Immunity	Operating Temperature	Package	UL Recognition
HCPL-7860	Optically Isolated Sigma-Delta (S-D) Modulator	12-bit Linearity, 1% Internal Reference Voltage Matching, Offset Calibration (with HCPL-0872)	200 mV	5 V	200 ns (Pre-Trigger Mode 2 with HCPL-0872)	12-bit (5 s delay), 14-bit (102 s delay)	15 kV/s	-40C to +85C	DIP-8, Gull Wing Surface Mount	3750 Vrms for 1 minute per UL1577
HCPL-786J	Optically Isolated Sigma-Delta (S-D) Modulator	12-bit Linearity, 1% Internal Reference Voltage Matching, Offset Calibration (with HCPL-0872)	200 mV	5 V	200 ns (Pre-Trigger Mode 2 with HCPL-0872)	12-bit (5 s delay), 14-bit (102 s delay)	15 kV/s	-40C to +85C	SO-16	5000 Vrms for 1 minute per UL1577
Electrical Specifications (Typical, unless otherwise noted):
	Output Logic High Voltage (VOH)	3.9 V	4.9 V							IOUT = -100 A
	Output Logic Low Voltage (VOL)	0.1 V	0.6 V							IOUT = 1.6 mA
	Internal Reference Voltage (VREF)	320 mV								Absolute Tolerance: -4% to +4%
	Signal-to-Noise Ratio (SNR)	62 dB	73 dB							With HCPL-0872, 141 mVrms sine wave
	Signal Delay (tDSIG)	19 s	23 s							With HCPL-0872
	Fast Over-Range Detection (tOVR1)	2.0 s	3.0 s	4.2 s						With HCPL-0872

2410121758_Broadcom-HCPL-7860-500E_C80207.pdf