LTC2637IMS-LMI12#TRPBF

Overview

The LTC2637IMS-LMI12#TRPBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference with a 10ppm/°C temperature coefficient, providing a full-scale output of 2.5V when operating in internal reference mode. The device supports a supply voltage range of 2.7V to 5.5V and communicates via a 2-wire I2C-compatible serial interface. It includes rail-to-rail output buffers, double-buffered data latches, and a power-on reset circuit configured to initialize outputs to mid-scale. Packaged in a 16-lead MSOP, it ensures monotonicity over the industrial temperature range of –40°C to 85°C.

Feature Summary

• Octal 12-bit resolution with maximum integral nonlinearity error of ±2.5 LSB
• Integrated 10ppm/°C precision reference yielding 2.5V full-scale output
• Rail-to-rail output buffers guaranteed monotonic from –40°C to 85°C
• Double-buffered data latches and ultralow DAC-to-DAC crosstalk (<3nV•s)

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment

Procurement Notes

Verify that the ordering suffix #TRPBF corresponds to the tape and reel packaging configuration containing 2500 pieces. Confirm the IMS package designation matches the required 16-lead MSOP footprint for PCB layout compatibility. Ensure the LMI12 suffix aligns with the specific 12-bit resolution and mid-scale power-on reset requirement for the target application design.

Selection Notes

Select this part when eight independent 12-bit channels are required within a single component. The internal reference simplifies board design by eliminating external reference components. Verify that the 2.7V to 5.5V supply range meets system power constraints. Consider the H-grade variant if operation above 85°C or a 4.096V full-scale output is necessary.

Part Context

This component belongs to the LTC2637 family, which offers 12-, 10-, and 8-bit resolutions in both DFN and MSOP packages. The IMS variant specifically denotes the Industrial temperature grade housed in a 16-lead MSOP package. Other family members include the LTC2635 quad-channel version and the LTC2634 SPI-interface version.

Replacement Considerations

LTC2637IMS-LZ12#TRPBF: Identical electrical specifications but resets to zero-scale upon power-up instead of mid-scale.

FAQ

What is the settling time for the LTC2637-12?

The typical settling time to ±1LSB for the 12-bit version is 4.5µs at VCC = 3V and 5µs at VCC = 5V.

How does the REF pin function in internal reference mode?

In internal reference mode, the REF pin provides access to the internal 1.25V reference voltage (half of the 2.5V full-scale output). It can be bypassed to ground with up to 10µF.

What is the maximum clock frequency for the I2C interface?

The LTC2637 operates in standard mode (100kHz) and fast mode (400kHz).