LTC2645HMS-L8#TRPBF

Overview

The LTC2645HMS-L8#TRPBF is a quad 8-bit PWM-to-voltage output DAC from Analog Devices, housed in a 16-lead MSOP package. It integrates a high-accuracy, low-drift 10ppm/°C reference, providing a full-scale output of 2.5V. The device features rail-to-rail buffered outputs capable of sourcing/sinking up to 5mA at 3V or 10mA at 5V. It operates on a single 2.7V to 5.5V supply with digital inputs supporting 1.71V to 5.5V. Outputs update and settle to accuracy within 8µs typically after each PWM rising edge, eliminating the need for external analog filters.

Feature Summary

• Quad 8-bit resolution with ±0.5 LSB max DNL and ±0.05 LSB max INL
• Integrated 10ppm/°C reference yielding 2.5V full-scale output
• No latency PWM-to-voltage conversion with <8µs settling time
• Pin-selectable internal or external reference modes

Applications

• Digital Calibration
• Trimming and Adjustment
• Level Setting
• Process Control and Industrial Automation
• Instrumentation

Procurement Notes

Verify the H suffix indicates the automotive temperature grade (-40°C to 125°C) and L8 specifies 8-bit resolution with 2.5V internal reference. Confirm the TRPBF suffix denotes tape and reel packaging. Ensure compatibility with system voltage ranges (2.7V–5.5V VCC, 1.71V–5.5V IOVCC). Check for pinout consistency with other LTC2645 variants if substituting.

Selection Notes

Select this part for applications requiring direct PWM input without external filtering. The 8-bit resolution suits cost-sensitive or lower-precision control loops. Choose internal reference mode for simplified design; use external reference mode via REFSEL for custom full-scale voltages. Ensure PWM frequency stays within 100kHz limit for 8-bit operation to maintain accuracy.

Part Context

This component belongs to the LTC2645 family, which includes 12-bit and 10-bit variants. The 'H' grade provides extended temperature range compared to Commercial (C) or Industrial (I) grades. The 'L8' designation specifically identifies the 8-bit resolution version with a 2.5V internal reference setting.

Replacement Considerations

LTC2645IMS-L8#PBF offers identical electrical specifications but in tube packaging instead of tape and reel. Other resolutions like LTC2645HMS-L12#TRPBF provide higher precision but may require different timing considerations.