LTC2672HUH-12#PBF

Overview

The LTC2672HUH-12#PBF is a five-channel, 12-bit current source digital-to-analog converter (DAC) from Analog Devices. It features SoftSpan technology with eight programmable output current ranges per channel, supporting full-scale outputs up to 300 mA. The device includes a precision internal 1.25 V reference and an analog multiplexer for monitoring channel voltages and currents. Each channel has a dedicated supply pin operating from 2.1 V to VCC, with internal switches allowing connection to an optional negative supply. It utilizes a 3-wire SPI-compatible interface and operates within a temperature range of -40°C to +125°C.

Feature Summary

• Five-channel 12-bit current source DAC with per-channel programmable ranges: 300 mA, 200 mA, 100 mA, 50 mA, 25 mA, 12.5 mA, 6.25 mA, and 3.125 mA.
• Guaranteed low dropout voltage of 0.6 V at 200 mA and flexible single/dual-supply operation.
• Integrated precision 1.25 V reference with maximum temperature coefficient of 10 ppm/°C in LFCSP package.
• Internal analog multiplexer enables monitoring of all channel output voltages and currents via a single MUX pin.

Applications

• Tunable lasers
• Semiconductor optical amplifier biasing
• Resistive heaters
• Current mode biasing

Procurement Notes

Verify the specific suffix HUH-12 corresponds to the 32-lead LFCSP package and 12-bit resolution variant when sourcing. Confirm that the H-grade designation ensures guaranteed operation across the extended industrial temperature range of -40°C to +125°C. Ensure compatibility with the required SPI clock rates and logic levels defined in the datasheet specifications.

Selection Notes

Select this component for applications requiring high compliance current sources with independent channel control. The 12-bit resolution provides sufficient granularity for most biasing needs, while the SoftSpan feature allows optimization of noise and power dissipation by selecting the lowest appropriate current range. Consider the separate VDDx supplies for each channel to minimize crosstalk and manage thermal performance effectively.

Part Context

This part belongs to the LTC2672 family, which also offers 16-bit resolution variants (LTC2672-16). The HU prefix indicates the H-grade temperature rating, while UH specifies the 32-lead lead frame chip scale package (LFCSP). Other package options include the 36-ball WLCSP. The device shares core functionality with the broader SoftSpan DAC family but is optimized for multi-channel current sourcing.

Replacement Considerations

Direct replacements within the same family include the LTC2672-16 for higher resolution or other package variants like the WLCSP version if footprint changes are acceptable. Cross-family comparisons should consider the LTC2662 series for similar current source capabilities but verify interface and pinout compatibility.