LTC2688IUJ-12#TRPBF

Overview

The LTC2688IUJ-12#TRPBF is a 16-channel, 12-bit digital-to-analog converter (DAC) from Analog Devices. It features SoftSpan technology allowing independently programmable output ranges of 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, and ±15 V. The device includes an internal precision 4.096 V reference with a maximum temperature coefficient of ±5 ppm/°C. Key electrical specifications include a maximum integral nonlinearity (INL) of ±0.75 LSB and differential nonlinearity (DNL) of ±0.25 LSB. It operates on a single analog supply voltage (VCC) ranging from 4.75 V to 5.25 V and supports dual-supply configurations up to ±15 V. The unit is housed in a 40-lead LFCSP package.

Feature Summary

• 16 independent channels with individually programmable SoftSpan output ranges up to ±15 V
• Integrated precision 4.096 V reference with ±5 ppm/°C temperature coefficient
• Built-in rail-to-rail output buffers capable of sourcing or sinking up to 20 mA
• Supports SPI and MICROWIRE-compatible 3-wire serial interfaces with logic levels as low as 1.71 V

Applications

• Optical networking
• Instrumentation
• Data acquisition systems
• Automatic test equipment
• Process control and industrial automation

Procurement Notes

Verify the #TRPBF suffix indicates tape-and-reel packaging for automated assembly. Confirm the 'I' grade designation matches the required operating temperature range of -40°C to +85°C. Ensure the specific revision level aligns with design requirements, noting potential updates in datasheet revisions such as Rev C.

Selection Notes

Select this component when high channel density and flexible voltage ranges are required. The 12-bit resolution offers a balance between cost and performance compared to the 16-bit variant. Verify that the ±20 mA drive capability meets load requirements and that the 40-lead LFCSP footprint fits the PCB layout constraints.

Part Context

This part belongs to the LTC2688 family, which also includes 16-bit resolution variants (e.g., LTC2688-16). The 'I' suffix denotes the industrial temperature grade (-40°C to +85°C), while 'H' denotes the extended grade (-40°C to +125°C). The 'UJ' code specifies the 40-lead LFCSP package type.

Replacement Considerations

Direct replacements within the same series include the LTC2688IUJ-16#TRPBF for higher resolution or the LTC2688HUJ-12#TRPBF for extended temperature operation. Cross-family substitutes like the LTC2664 offer fewer channels but similar interface protocols.