LTC2634HMSE-HMX8#PBF

Overview

The LTC2634HMSE-HMX8#PBF is a quad 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 within a supply voltage range of 4.5V to 5.5V. The device utilizes a 3-wire SPI/MICROWIRE compatible interface for communication. Key specifications include a maximum integral nonlinearity (INL) error of ±0.5 LSB, a settling time of 3.9µs at 5V, and ultralow crosstalk between DAC channels of 2.4nV•s. It is housed in a 10-lead MSOP package and supports power-on reset to mid-scale in external reference mode.

Feature Summary

• Quad 8-bit resolution with rail-to-rail output buffers
• Integrated 4.096V full-scale reference with ±10ppm/°C drift
• Ultralow DAC-to-DAC crosstalk of 2.4nV•s
• Power-on reset to mid-scale in external reference mode

Applications

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

Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free compliance and RoHS adherence. Confirm the MSE package designation corresponds to the 10-lead MSOP form factor. Ensure the H-grade temperature rating (-40°C to 125°C) meets operational requirements. Check for automotive qualification if AEC-Q100 compliance is necessary for the target application.

Selection Notes

Select this part when a quad 8-bit DAC with a fixed 4.096V internal reference is required. The H-grade variant supports higher operating temperatures up to 125°C compared to C or I grades. The HMX suffix ensures the outputs reset to mid-scale upon power-up when using an external reference, which may be critical for system initialization safety. Verify that the 4.5V minimum supply voltage aligns with the system power rails.

Part Context

This component belongs to the LTC2634 family, which offers quad DACs in 12-, 10-, and 8-bit resolutions. The HMSE variant specifically denotes the Automotive grade (H), MSOP package (MSE), and External Reference Mid-Scale Reset (HMX) configuration. It shares architectural similarities with the LTC2636 and LTC2637 but differs in channel count and interface type.

Replacement Considerations

Direct pin-compatible replacements within the same package and resolution include other LTC2634 variants with different reset behaviors or reference voltages, such as LTC2634HMSE-LMX8#PBF (2.5V ref). For octal configurations, the LTC2636 series is an alternative but requires interface adaptation.