LTC2637IMS-LMI8#PBF

Overview

The LTC2637IMS-LMI8#PBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features an integrated precision reference with a full-scale output of 2.5V and operates on a single 2.7V to 5.5V supply. The device utilizes a 16-lead MSOP package and communicates via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±0.5 LSB, a settling time of 3.5µs at 3V, and ultralow DAC-to-DAC crosstalk below 3nV•s. It includes double-buffered data latches and power-on reset options.

Feature Summary

• Octal 8-bit resolution with rail-to-rail output buffers guaranteed monotonic over the operating temperature range
• Integrated 10ppm/°C precision reference providing a 2.5V full-scale output
• Ultralow crosstalk between DAC channels (<3nV•s) and low noise performance (0.75mVP-P)
• I2C-compatible serial interface with selectable internal or external reference inputs

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment
• Automotive electronics
• Optical networking devices

Procurement Notes

Verify the specific ordering suffix LMI8#PBF against the manufacturer's current documentation to confirm the package type, temperature grade, and power-on reset behavior. Ensure compatibility with the required I2C address configuration using CA0, CA1, and CA2 pins. Confirm that the supply voltage range of 2.7V to 5.5V aligns with the system design requirements for the LTC2637-L variant.

Selection Notes

Select this component when eight independent 8-bit voltage outputs are required in a compact footprint. The LTC2637-L variant supports lower supply voltages starting at 2.7V, making it suitable for portable applications. Choose the internal reference mode if board space for an external reference is limited; otherwise, use the REF pin for an external reference to set custom full-scale ranges. Ensure the I2C bus speed does not exceed 400kHz for reliable operation.

Part Context

This part belongs to the LTC2637 family of octal DACs, which also includes 10-bit and 12-bit variants (LTC2637-10, LTC2637-12). The 'L' designation indicates the 2.5V full-scale version powered by a 2.7V–5.5V supply, while 'H' denotes the 4.096V version requiring 4.5V–5.5V. The 'MS' suffix specifies the 16-lead MSOP package, and 'I' indicates the industrial temperature range (-40°C to 85°C).

Replacement Considerations

Direct replacements within the same family include LTC2637IMS-LMI10#PBF (10-bit) and LTC2637IMS-LMI12#PBF (12-bit), which share identical pinouts and interfaces but offer higher resolution. For quad-channel applications, consider the LTC2635 series, though it has fewer channels and different package options.