LTC2657IFE-H12#TRPBF

Overview

The LTC2657IFE-H12#TRPBF is an octal 12-bit digital-to-analog converter featuring a 400kHz I²C interface and integrated reference. It operates on a single 4.5V to 5.5V supply, delivering a full-scale output of 4.096V with rail-to-rail buffered outputs. The device guarantees monotonicity over temperature and includes a power-on reset circuit configurable for zero-scale or mid-scale initialization. Packaged in a 20-lead thermally enhanced TSSOP, it supports industrial temperatures from –40°C to 85°C.

Feature Summary

• Octal architecture with eight independent 12-bit DAC channels
• Integrated 2.048V reference yielding 4.096V full-scale output
• Rail-to-rail output buffers with ultralow crosstalk (0.8nV•s)
• Configurable power-on reset to zero-scale or mid-scale

Applications

• Mobile communications systems
• Process control and industrial automation
• Instrumentation and automatic test equipment
• Automotive electronic applications

Procurement Notes

Verify the #TRPBF suffix confirms tape and reel packaging suitable for automated surface-mount assembly. Confirm the 'I' designation matches the required –40°C to 85°C industrial operating range. Ensure the H option aligns with the 4.5V minimum supply requirement for the 4.096V internal reference configuration.

Selection Notes

Select this model for designs requiring multiple low-power voltage outputs controlled via a standard two-wire serial bus. The H variant is mandatory for 4.096V spans, while the L variant supports 2.7V supplies for 2.5V spans. Consider the external reference mode if higher output swings beyond the internal limits are necessary.

Part Context

This component belongs to the LTC2657 family of octal DACs, which also offers 16-bit resolution variants and commercial temperature grades. The specific part number denotes the 12-bit accuracy class, industrial temperature rating, and thermally enhanced TSSOP package form factor.

Replacement Considerations

Public confirmed substitute part numbers: LTC2657IUFD-H12#TRPBF (QFN package equivalent).

FAQ

How is the power-on reset state determined?

The PORSEL pin determines the initial state; tying it to GND resets outputs to zero-scale, while tying it to VCC resets them to mid-scale.

What is the maximum I²C clock frequency?

The device supports standard mode up to 100kHz and fast mode up to 400kHz.

Can the internal reference be disabled?

Yes, the internal reference can be turned off to allow operation with an external reference voltage applied to the REFIN/OUT pin.