LTC2666HUH-16#PBF

Overview

The LTC2666HUH-16#PBF is an octal 16-bit digital-to-analog converter (DAC) featuring SoftSpan technology for independently programmable output ranges up to ±10V. It integrates a precision reference with a maximum temperature coefficient of 10ppm/°C and includes A/B toggle capability via software or dedicated pins. The device operates on analog supplies from ±4.5V to ±15.75V (or single supply) and utilizes a 3-wire SPI/Microwire interface compatible with logic levels as low as 1.71V. Key electrical parameters include a settling time of 20µs for ±10V steps, integral nonlinearity (INL) of ±2.2 LSB, and differential nonlinearity (DNL) of ±0.2 LSB. It is housed in a 32-lead 5mm × 5mm QFN package.

Feature Summary

• Octal 16-bit resolution with independently programmable output ranges: 0V to 5V, 0V to 10V, ±2.5V, ±5V, and ±10V
• Integrated precision reference with 10ppm/°C max temperature coefficient and optional external reference input
• A/B toggle functionality allowing dual data storage per channel, selectable via software or hardware pin
• Built-in rail-to-rail output buffers driving ±10mA with guaranteed monotonicity over temperature

Applications

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

Procurement Notes

Verify the suffix 'H' confirms the automotive temperature grade (-40°C to +125°C). Confirm '#PBF' indicates lead-free finish. Ensure the host system supports the required analog supply voltages (±4.5V to ±15.75V) and digital logic levels (1.71V to VCC). Check PCB layout requirements for the exposed pad connection to V–.

Selection Notes

Select this component when eight channels of high-precision voltage output are required with flexible range settings. The H-grade variant is necessary for environments exceeding 85°C. Consider the internal reference stability versus external reference needs; the internal reference simplifies design but limits range options compared to external inputs. Verify that the 50MHz SPI clock rate meets the system's timing constraints.

Part Context

This part belongs to the LTC2666 family of SoftSpan DACs. The 'UH' designation specifies the 32-lead QFN package. The '16' indicates 16-bit resolution, distinguishing it from the 12-bit variants. The 'H' suffix denotes the extended temperature range suitable for automotive applications, while 'I' covers industrial and 'C' covers commercial ranges.

Replacement Considerations

Direct replacements within the same package and pinout include other LTC2666 variants with different temperature grades (e.g., LTC2666IUH-16#PBF) or resolutions (e.g., LTC2666HUH-12#PBF), provided the resolution and temperature requirements align with the application.