LTC2637IDE-HZ8#PBF

Overview

The LTC2637IDE-HZ8#PBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference with a full-scale output of 4.096V and operates on a single 4.5V to 5.5V supply. The device utilizes a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key specifications include rail-to-rail buffered outputs, guaranteed monotonicity over the –40°C to 125°C temperature range, and ultralow DAC-to-DAC crosstalk (<3nV•s). It incorporates double-buffered data latches and a power-on reset circuit configured for zero-scale initialization.

Feature Summary

• Octal architecture with 8 independent 8-bit channels in a 14-lead DFN package
• Integrated 4.096V precision reference with ±10ppm/°C drift
• Rail-to-rail output buffers with <3nV•s inter-channel crosstalk
• I2C interface with selectable slave addresses via CA0 pin

Applications

• Process control and industrial automation systems
• Mobile communications equipment
• Automatic test equipment
• Portable instrumentation
• Automotive applications

Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the 'H' grade designation matches the required –40°C to 125°C operating temperature range for the target environment. Ensure the 'Z' power-on reset configuration aligns with system startup requirements, as this variant resets to zero-scale rather than mid-scale.

Selection Notes

Select this part when eight low-cost, high-density DAC channels are required in a compact footprint. The H-grade version is necessary for automotive or wide-temperature industrial environments requiring 4.096V full-scale output. Verify that the I2C bus speed requirements do not exceed 400kHz and that the system can accommodate the zero-scale power-on state.

Part Context

This component belongs to the LTC2637 family, which includes 12-bit, 10-bit, and 8-bit variants. The IDE suffix denotes the Industrial temperature grade (-40°C to 85°C), while the H suffix specifies the Automotive/Wide Temperature grade (-40°C to 125°C). The LZ12 suffix indicates the 12-bit resolution and Zero-Scale reset option. This specific part combines the H-grade temperature rating with 8-bit resolution.

Replacement Considerations

LTC2637IDE-HMI8#PBF offers identical electrical characteristics but resets to mid-scale upon power-up instead of zero-scale.