Broadcom Optically Isolated Amplifier, 8-Pin SM DIP, 3.75kV, 18kHz

The Broadcom Optically Isolated Amplifier is an isolated 15-bit A/D converter designed for precise measurement applications. This isolated modulator allows the direct measurement of motor phase currents in power inverters, making it highly suitable for automotive environments.

It converts a low-bandwidth analogue input into a high-speed one-bit data stream by means of a Sigma-Delta over-sampling modulator. This modulation technique provides 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.

Key Features

• 800ns conversion time (pre-trigger mode 2)
• Fast 3µs over-range detection
• Serial I/O compatible with SPI, QSPI, and Microwire
• 1% internal reference voltage matching
• 15kV/µs isolation transient immunity
• Minimum CMR of 20000V/µs
• ±1% maximum gain error at 25°C

With regulatory approvals including UL, CSA, and IEC/EN/DIN EN 60747-5-2, this optocoupler operates reliably within a temperature range of -40°C to 85°C. It comes in a 300mil Surface Mount DIP-8 package with compact dimensions of 43mm x 33mm x 15mm and a lightweight design of just 1 gram.