LTC2632ACTS8-LI12

Overview

The LTC2632ACTS8-LI12 is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc., housed in an 8-lead TSOT-23 package. It features an integrated precision reference with a full-scale output of 2.5V and a temperature coefficient of 10ppm/°C. The device operates on a single supply ranging from 2.7V to 5.5V and includes rail-to-rail output buffers that are guaranteed monotonic over the -40°C to 125°C automotive temperature range. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface supporting clock rates up to 50MHz. Power-on reset defaults to mid-scale in internal reference mode, and the part draws 0.4mA at 3V.

Feature Summary

• Dual 12-bit DACs with integrated 2.5V reference (10ppm/°C drift)
• Rail-to-rail output buffers with guaranteed monotonicity
• 3-wire SPI/MICROWIRE interface with 50MHz clock rate
• Power-on reset to mid-scale in internal reference mode

Applications

• Mobile communications
• Process control and industrial automation
• Automatic test equipment
• Portable equipment
• Automotive systems

Procurement Notes

Verify the ordering suffix 'LI12' confirms the specific configuration: 'L' for 2.5V full-scale, 'I' for power-on reset to mid-scale in internal reference mode, and '12' for 12-bit resolution. Ensure the 'A' grade designation matches the required maximum INL error of ±1.5LSB. Confirm the 'TS8' suffix corresponds to the 8-lead plastic TSOT-23 package type required for the application board layout.

Selection Notes

Select this component when a dual-channel DAC with high accuracy and low drift is required in a compact footprint. The 'A' grade ensures a maximum Integral Nonlinearity (INL) of ±1.5LSB, suitable for precision applications. The internal 2.5V reference simplifies design by eliminating external reference components. Verify that the system supply voltage falls within the 2.7V to 5.5V range and that the mid-scale power-on reset behavior aligns with downstream circuit requirements.

Part Context

This part belongs to the LTC2632 family, which offers variations in resolution (8, 10, or 12 bits), full-scale voltage (2.5V or 4.096V), and power-on reset options (zero-scale or mid-scale). The LTC2632ACTS8-LI12 specifically combines 12-bit resolution with the 2.5V internal reference and mid-scale reset. Other variants include the LTC2632H series for higher voltage outputs and different reset configurations like LTC2632LZ12 for zero-scale initialization.

Replacement Considerations

Direct substitutes within the same family include LTC2632ACCTS8-LI12 (commercial temp) or LTC2632AHCTS8-LI12 (automotive temp, H-grade). For different reset behaviors, consider LTC2632ACCTS8-LX12 (external ref mid-scale) or LTC2632ACCTS8-LZ12 (zero-scale). Higher accuracy grades are not available beyond 'A'. External reference versions like LTC2632ACCTS8-LX12 require careful supply sequencing.