Analog Devices Inc. LTC4332 SPI Extender Over Rugged Differential Link

Analog Devices LTC4332 SPI Extender over a rugged differential link is designed for operation in high noise industrial environments over long distances. The LTC4332 can transmit SPI data, including an interrupt signal, using a ±60V fault protected differential transceiver up to 2MHz over two twisted-pair cables.

The extended common-mode range and high common-mode rejection on the differential link provide tolerance to large ground differences between nodes. Additionally, the LTC4332 SPI Extender also supports external galvanic isolation on the link. The device offers a control interface using a separate slave select for configuration and fault monitoring. The LTC4332 is available in a 20-lead QFN package with three temperature grade options (commercial 0°C to 70°C, industrial –40°C to 85°C, and high temperature –40°C to 125°C).


  • 2MHz SCK over 10m, operation up to 600m
  • Three extended slave selects
  • Protected from overvoltage lines fault to ±60V
  • ±40kV ESD on link pins
  • IEC level 4 ESD ±8kV and EFT ±5kV on link pins
  • ±25V Extended common-mode range
  • Extended interrupt
  • Separate programmable SPI modes
  • Link galvanic isolation supported
  • 3V to 5.5V supply voltage
  • 1.62V to 5.5V logic supply
  • 4mm × 5mm 20-lead QFN package


  • Industrial control and sensors
  • Lighting and sound system control


Application Circuit Diagram - Analog Devices Inc. LTC4332 SPI Extender Over Rugged Differential Link
Published: 2019-12-02 | Updated: 2023-08-21