LTC2632CTS8-LI12

Overview

The LTC2632CTS8-LI12 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 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 voltage ranging from 2.7V to 5.5V. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface supporting clock rates up to 50MHz. Key electrical specifications include a maximum Integral Nonlinearity (INL) error of ±1.5LSB for the A-grade variant, a settling time of 4.4µs at 3V, and rail-to-rail output buffers. The part guarantees monotonicity and includes a power-on reset circuit configured to initialize outputs to mid-scale.

Feature Summary

• Dual 12-bit DACs with integrated 2.5V precision reference (10ppm/°C drift)
• Maximum INL error of ±1.5LSB (A-grade specification)
• 3-wire SPI/MICROWIRE serial interface with SCK frequencies up to 50MHz
• Power-on reset to mid-scale in internal reference mode

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 current documentation to confirm package type, temperature grade, and power-on reset behavior. Ensure the selected variant matches the required supply voltage range (2.7V–5.5V for L-series) and reference configuration. Cross-reference the part number with official distributor catalogs to confirm availability and lead times prior to procurement.

Selection Notes

Select this component when a dual-channel, high-accuracy DAC is required in a compact TSOT-23 footprint. The 'LI' suffix indicates a 2.5V full-scale output with mid-scale power-on reset in internal reference mode. Choose the 'A' grade if strict linearity performance (±1.5LSB max INL) is necessary. Ensure the system supply voltage remains within the 2.7V to 5.5V range for proper operation of the L-series devices.

Part Context

The LTC2632 is part of a family of dual DACs offering selectable resolutions (8-, 10-, or 12-bit) and reference options. Variants are distinguished by temperature grades (C for commercial, H for automotive), full-scale voltages (L for 2.5V, H for 4.096V), and power-on reset states (I for mid-scale internal, X for mid-scale external, Z for zero-scale). This specific model represents the commercial grade, 12-bit resolution, 2.5V internal reference configuration.

Replacement Considerations

Direct pin-compatible replacements within the same family include LTC2632ACTS8-LZ12 (zero-scale reset) or LTC2632ACTS8-HI12 (4.096V full-scale). Verify that any substitute maintains the required 3-wire serial interface compatibility and supply voltage constraints.