LTC2640ACTS8-LM12#TRMPBF

Overview

The LTC2640ACTS8-LM12#TRMPBF is a single-channel, 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference providing a full-scale output of 2.5V and operates on a single supply voltage ranging from 2.7V to 5.5V. The device includes a rail-to-rail output buffer guaranteed monotonic over temperature. It utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±1 LSB for the A-grade device, a typical settling time of 4.1µs at 3V, and low power consumption of 180µA at 3V. The part incorporates a power-on reset circuit that sets the output to mid-scale upon initialization.

Feature Summary

• 12-bit resolution with ±1 LSB maximum INL error (A-Grade)
• Integrated 10ppm/°C precision reference with 2.5V full-scale output
• Rail-to-rail output buffer guaranteed monotonic over temperature
• Power-on reset to mid-scale (M suffix) with double-buffered data latches

Applications

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

Procurement Notes

Verify the specific ordering suffix #TRMPBF indicates a 500-piece tape and reel packaging quantity, distinct from the standard 2,500-piece reel. Confirm the C temperature grade covers the required operational range of 0°C to 70°C. Ensure the LM12 designation matches the need for mid-scale power-on reset and 2.5V internal reference configuration before procurement.

Selection Notes

Select this component when a compact 8-lead TSOT-23 package is required alongside high accuracy (±1 LSB INL). Choose the LM variant if system initialization requires the DAC output to settle at mid-scale rather than zero-scale upon power-up. Verify that the 2.7V to 5.5V supply range aligns with the system's available power rails and that the 180µA active current fits the power budget.

Part Context

This part belongs to the LTC2640 family of single-channel DACs, which also offers 10-bit and 8-bit resolutions. Variants exist with different full-scale voltages (2.5V or 4.096V), power-on reset behaviors (zero or mid-scale), and temperature grades (Commercial, Industrial, Automotive). The ACTS8-LM12 specifically denotes the Commercial grade, TSOT-23 package, Mid-scale reset, and 12-bit resolution.

Replacement Considerations

Direct pin-compatible replacements within the same family include LTC2640ACTS8-ZM12#TRMPBF for zero-scale reset or LTC2640ACTS8-LZ12#TRMPBF for zero-scale reset without the A-grade accuracy. For higher resolution needs in the same package, consider the LTC2641 series, though pinouts and interfaces may differ.