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HCPL-786J Datasheet Optically Isolated Sigma-delta Modulator

Manufacturer: Agilent Technologies

Overview: Agilent HCPL-7860/HCPL-786J Optically Isolated Sigma-Delta (Σ−∆) Modulator Data Sheet In operation, the HCPL-7860/ HCPL-786J Isolated Modulator (optocoupler with 3750 VRMS dielectric withstand voltage rating) converts a lowbandwidth analog input into a high-speed one-bit data stream by means of a Sigma-Delta (Σ− ∆) over-sampling modulator. This modulation provides for high noise margins and excellent immunity against isolation-mode transients. The modulator data and on-chip sampling clock are encoded and transmitted across the isolation boundary where they are recovered and decoded into separate high-speed clock and data channels.

General Description

The HCPL-7860/HCPL-786J Optically Isolated Modulator and HCPL-0872 Digital Interface IC or digital filter together form an isolated programmable two-chip analog-to-digital converter.

The isolated modulator allows direct measurement of motor phase currents in power inverters.

1 2 Input Current 3 4 HCPL-7860 • Safety Approval: UL 1577, CSA and IEC/EN/DIN EN 60747-5-2 HCPL-0872 or Digital Filter MCU or DSP 7 DECODE 6 Applications • Motor Phase and Rail Current Sensing • Data Acquisition Systems • Industrial Process Control • Inverter Current Sensing • General Purpose Current Sensing and Monitoring 5 A 0.1 µF bypass capacitor must be connected between pins VDD and Ground CAUTION: It is advised that normal static precautions be taken in handling and assembly of this component to prevent damage and/or degradation, which may be induced by ESD.

Key Features

  • 12-bit Linearity.
  • 200 ns Conversion Time (PreTrigger Mode 2 with HCPL-0872).
  • 12-bit Effective Resolution with 5 µs Signal Delay (14-bit with 102 µs) (with HCPL-0872).
  • Fast 3 µs Over-Range Detection (with HCPL-0872).
  • ± 200 mV Input Range with Single 5 V Supply.
  • 1% Internal Reference Voltage Matching.
  • Offset Calibration (with HCPL0872).
  • -40°C to +85°C Operating Temperature Range.
  • 15 kV/µs Isolation Transient Immunity.

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