LTC2636IMS-LMX8#PBF

Overview

The LTC2636IMS-LMX8#PBF is an octal, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a 16-lead MSOP package and operates within an industrial temperature range of –40°C to 85°C. The device utilizes an SPI/MICROWIRE-compatible 3-wire serial interface with clock rates up to 50MHz. It is configured for external reference mode, where the full-scale output is determined by the voltage applied to the REF pin. Power-on reset defaults to mid-scale in external reference mode. Key electrical specifications include a settling time of 3.4µs at 3V, a supply current of 0.9mA at 3V, and rail-to-rail output buffers guaranteed monotonic over the operating temperature range.

Feature Summary

• Octal architecture with 8 independent 8-bit DAC channels in a single 16-lead MSOP package
• SPI/MICROWIRE compatible 3-wire serial interface supporting clock rates up to 50MHz
• External reference configuration with power-on reset to mid-scale
• Rail-to-rail output buffers with ultralow crosstalk (<2.4nV•s) and guaranteed monotonicity

Applications

• Mobile communications systems requiring multi-channel signal generation
• Process control and industrial automation instrumentation
• Automatic test equipment needing precise voltage references
• Portable battery-powered equipment due to low power consumption

Procurement Notes

Verify the specific suffix LMX8 indicates external reference mode with mid-scale power-on reset. Confirm the IMS designation corresponds to the industrial temperature grade (-40°C to 85°C) and MSOP-16 package. Ensure compatibility with system voltage levels, as the device supports 2.7V to 5.5V supplies depending on the internal reference variant, though H-grade parts require 4.5V to 5.5V.

Selection Notes

Select this part when eight independent 8-bit DAC outputs are required in a compact surface-mount package. The LMX suffix is critical for applications requiring mid-scale initialization during power-up in external reference configurations. Compare against LTC2636CDE variants if commercial temperature range suffices, or LTC2636H variants if automotive temperature ranges (-40°C to 125°C) are needed. Ensure the external reference voltage matches the desired full-scale output range.

Part Context

The LTC2636 family integrates high-accuracy, low-drift reference capabilities into octal DACs. The IMS-LMX8 variant specifically targets industrial environments requiring robust performance across wide temperature variations. It complements single-channel (LTC2640) and dual-channel (LTC2632) counterparts by offering higher channel density without sacrificing linearity or speed.

Replacement Considerations

Direct replacements include other LTC2636MS variants with different resolution or reset configurations, such as LTC2636IMS-LMI8#PBF (internal reference) or LTC2636IMS-LZ8#PBF (zero-scale reset). Cross-family substitutes like LTC2637 offer I2C interfaces instead of SPI.