LTC2636CDE-LZ12#PBF

Overview

The LTC2636CDE-LZ12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated 10ppm/°C precision reference with a full-scale output of 2.5V. The device operates on a single 2.7V to 5.5V supply and includes rail-to-rail output buffers. It utilizes a 3-wire SPI/MICROWIRE-compatible serial interface with clock rates up to 50MHz. Key specifications include a maximum integral nonlinearity error of ±2.5 LSB, a settling time of 4.4µs at 3V, and power-on reset to zero-scale in internal reference mode. The component is housed in a 14-lead 4mm × 3mm DFN package.

Feature Summary

• Octal architecture with eight independent 12-bit DAC channels
• Integrated 2.5V full-scale reference with 10ppm/°C drift
• Rail-to-rail output buffers with ultralow crosstalk (<2.4nV•s)
• Power-on reset to zero-scale for consistent system initialization

Applications

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

Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free construction and standard tube packaging as defined by Analog Devices. Confirm that the DE suffix corresponds to the 14-lead DFN package variant. Ensure compatibility with the commercial temperature range (0°C to 70°C) specified for the C grade. Cross-reference the datasheet revision to confirm pinout and electrical characteristics match the intended design requirements.

Selection Notes

Select this part when eight isolated 12-bit outputs are required within a compact footprint. The LZ suffix ensures outputs initialize to zero volts upon power-up, which is critical for protecting downstream circuitry during startup. Choose the L series for operation from a 2.7V supply; the H series requires 4.5V minimum. Verify that the 50MHz SPI speed meets the system data throughput needs and that the 4.4µs settling time satisfies signal bandwidth constraints.

Part Context

This component belongs to the LTC2636 family of octal DACs, which also offers 10-bit and 8-bit resolutions. Variants exist with mid-scale reset options (MI/MX suffixes) or higher voltage references (H series). The DE package designation distinguishes it from the MSOP package variants. The family shares common interface protocols and architectural features while differing in resolution, reset behavior, and reference voltage capabilities.

Replacement Considerations

Direct substitutes within the same family include LTC2636CDE-LZ10#PBF (10-bit) and LTC2636CDE-LZ8#PBF (8-bit), provided lower resolution is acceptable. For mid-scale reset requirements, consider LTC2636CDE-LMI12#PBF. External reference designs may utilize LTC2636CDE-LMX12#PBF. Package changes to MSOP require schematic review for pinout differences regarding LDAC and CLR pins.