LTC2632ACTS8-LX12

Overview

The LTC2632ACTS8-LX12 is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, housed in an 8-lead TSOT-23 package. It features a selectable internal or external reference mode, with the 'LX' suffix indicating power-on reset to mid-scale when using an external reference. The device operates on a single supply of 2.7V to 5.5V and provides rail-to-rail output buffers. Key electrical specifications include a maximum integral nonlinearity (INL) of ±1.5 LSB, a settling time of 4.4 µs at 3V, and a low supply current of 0.4 mA at 3V. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface supporting clock rates up to 50 MHz.

Feature Summary

• Dual 12-bit DACs with integrated 10ppm/°C precision reference or external reference capability
• Power-on reset to mid-scale in external reference mode (LX suffix)
• Rail-to-rail output buffers with guaranteed monotonicity
• Maximum INL error of ±1.5 LSB for high accuracy applications

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's selection guide to confirm the power-on reset behavior and reference mode configuration. Ensure the supply voltage range matches the component's operational limits of 2.7V to 5.5V. Confirm that the 8-lead TSOT-23 package dimensions fit the target PCB layout constraints.

Selection Notes

Select this part if a dual-channel solution with high linearity (±1.5 LSB INL) and low power consumption is required. The LX variant is specifically designed for systems where the DAC outputs must initialize to mid-scale during power-up when an external reference is utilized. Compare against LZ variants if zero-scale initialization is preferred instead.

Part Context

This component belongs to the LTC2632 family, which offers various combinations of resolution (8-, 10-, 12-bit), temperature grades, and power-on reset options. The ACTS8 designation indicates the A-grade accuracy, commercial temperature range, and TSOT-23 packaging. Other variants in the series include LI (internal ref, mid-scale reset) and H-series parts requiring higher supply voltages.

Replacement Considerations

Direct substitutes within the same family include LTC2632ACTS8-LI12#TRMPBF (internal reference, mid-scale reset) and LTC2632ACTS8-LZ12#TRMPBF (internal reference, zero-scale reset). Verify that the replacement part's power-on reset behavior aligns with the system's startup requirements.