LTC2637IDE-LMX12#TRPBF

Overview

The LTC2637IDE-LMX12#TRPBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a selectable internal or external reference, with the 'L' suffix indicating a 2.5V full-scale output and operation from a single 2.7V to 5.5V supply. The device includes double-buffered data latches and a power-on reset circuit configured to reset to mid-scale in external reference mode. It communicates via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes.

Feature Summary

• Octal 12-bit resolution with rail-to-rail output buffers guaranteed monotonic over –40°C to 85°C
• Selectable internal or external reference; L-grade provides 2.5V full-scale output
• Power-on reset to mid-scale in external reference mode
• Ultralow DAC-to-DAC crosstalk (<3nV•s) and low noise (0.75mVP-P)

Applications

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

Procurement Notes

Verify the specific ordering suffixes for package type, temperature grade, and power-on reset configuration against the manufacturer's official documentation. Confirm that the selected variant matches the required supply voltage range and reference mode for the target application design.

Selection Notes

Select the LTC2637IDE-LMX12#TRPBF when an octal DAC with 12-bit precision is needed alongside an external reference source. The 'I' grade ensures operation within the industrial temperature range of –40°C to 85°C. Ensure the system design accommodates the 2.7V to 5.5V supply requirement and utilizes the double-buffered latches for synchronized updates.

Part Context

This component belongs to the LTC2637 family of octal DACs available in 14-lead DFN and 16-lead MSOP packages. Variants differ by resolution (8/10/12-bit), full-scale voltage (2.5V or 4.096V), and power-on reset behavior. The 'LMX' designation specifically denotes the 2.5V full-scale version with mid-scale reset in external reference mode.

Replacement Considerations

Direct substitutes within the same family include other LTC2637 variants with different resolutions or reset configurations. Verify pin compatibility and electrical specifications before substitution.

FAQ

What is the power-on reset behavior for the LTC2637-LMX12?

In external reference mode, the device resets all DAC outputs to mid-scale upon power-up.

What is the maximum integral nonlinearity error for the 12-bit version?

The maximum INL error for the LTC2637-12 is ±2.5 LSB.

Does the device support both internal and external references?

Yes, the LTC2637 allows selection between an integrated precision reference or an external reference applied to the REF pin.