LTC2636CDE-LMI8#PBF

Overview

The LTC2636CDE-LMI8#PBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, housed in a 14-lead plastic DFN package. It features an integrated precision reference with a full-scale output of 2.5V and operates on a single 2.7V to 5.5V supply. The device includes rail-to-rail output buffers guaranteed monotonic over the commercial temperature range of 0°C to 70°C. Communication is handled via a 3-wire SPI/Microwire-compatible serial interface supporting clock rates up to 50MHz. Power-on reset defaults to mid-scale in internal reference mode.

Feature Summary

• Octal 8-Bit Resolution: Provides eight independent DAC channels with ±0.5 LSB differential nonlinearity (DNL) and ±0.05 LSB integral nonlinearity (INL).
• Integrated Precision Reference: Features a built-in 10ppm/°C reference yielding a 2.5V full-scale output; supports external reference selection.
• Rail-to-Rail Output Buffers: Delivers analog outputs spanning the full supply range with ultralow crosstalk between DACs (<2.4nV•s).
• SPI Interface and Reset: Utilizes a 3-wire serial interface for control; incorporates 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 specific ordering suffix #PBF indicates lead-free construction and tube packaging for the DFN-14 variant. Confirm the 'C' grade designation aligns with the required 0°C to 70°C operating temperature range for the target application environment. Ensure the LMI8 suffix corresponds to the 8-bit resolution and mid-scale power-on reset behavior specified in the datasheet.

Selection Notes

Select this component when eight low-cost, 8-bit DAC channels are required in a compact DFN footprint. The LTC2636CDE-LMI8#PBF is suitable for applications needing a fixed 2.5V internal reference and mid-scale initialization. For wider temperature ranges or different reset behaviors, consider the I-grade or HZ/LMX suffix variants within the LTC2636 family.

Part Context

This part belongs to the LTC2636 family of octal DACs, which also offers 10-bit and 12-bit resolutions. The CDE package denotes the 14-lead DFN form factor, while the LMI8 suffix specifies the 2.5V internal reference, 8-bit resolution, and mid-scale power-on reset configuration. It serves as a cost-effective solution compared to higher-resolution counterparts like the LTC2636CDE-LMI12.

Replacement Considerations

Direct functional substitutes within the same package include other LTC2636 variants with matching pinouts, such as LTC2636CDE-LMX8#PBF (external reference mode) or LTC2636CDE-LZ8#PBF (zero-scale reset). Cross-family replacements require verification of pin compatibility and electrical parameter alignment.

FAQ

What is the default output state upon power-up for the LTC2636CDE-LMI8?

The device is configured for power-on reset to mid-scale in internal reference mode, resulting in an output voltage of approximately 1.25V.

Can the LTC2636CDE-LMI8 operate with an external reference voltage?

Yes, although it comes with an integrated 2.5V reference, the device can be configured to use an external reference applied to the REF pin, setting the full-scale output to that external voltage.

What is the maximum serial clock frequency supported by the SPI interface?

The 3-wire SPI/Microwire-compatible serial interface supports clock rates up to 50MHz.