LTC2637CDE-HMI12#PBF

Overview

The LTC2637CDE-HMI12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features a high-accuracy internal reference with a temperature coefficient of 10ppm/°C, providing a full-scale output of 4.096V. The device operates on a single 4.5V to 5.5V supply and communicates via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±2.5LSB, a settling time of 5µs at ±1LSB, and low noise performance of 750µVP-P in the 0.1Hz to 200kHz range. It incorporates double-buffered data latches and a power-on reset circuit configured to initialize outputs to mid-scale.

Feature Summary

• Octal architecture with 8 independent 12-bit DAC channels
• Integrated 4.096V precision reference with 10ppm/°C drift
• Rail-to-rail buffered outputs guaranteed monotonic over -40°C to 125°C
• I2C interface with selectable slave addresses via CA0-CA2 pins

Applications

• Process control and industrial automation systems
• Automatic test equipment requiring multi-channel signal generation
• Portable battery-powered instrumentation
• Optical networking transceivers

Procurement Notes

Verify the specific suffix HMI12 corresponds to the 12-bit resolution and mid-scale power-on reset configuration for the H-grade (4.096V) variant. Confirm the DE package designation matches the required 14-lead DFN footprint. Ensure the C temperature grade (0°C to 70°C) aligns with the target operating environment, as higher grades are available for wider ranges.

Selection Notes

Select this component when multiple isolated voltage outputs are needed within a compact space. The H-grade version requires a minimum 4.5V supply, distinguishing it from the L-grade which supports 2.7V operation. Consider the external reference capability if a different full-scale voltage than 4.096V is required. The I2C interface simplifies PCB routing compared to SPI alternatives, though address conflicts must be managed using the CA pins.

Part Context

This part belongs to the LTC2637 family of octal DACs, which also includes 10-bit and 8-bit variants. The 'H' designation indicates the 4.096V full-scale internal reference option, while 'L' denotes the 2.5V option. The 'C' suffix specifies the commercial temperature range. Other packages like MSOP are available for the same functional core.

Replacement Considerations

Direct pin-compatible substitutes within the same family include LTC2637CDE-LMI12#PBF (2.5V reference) or LTC2637CDE-HMX12#PBF (mid-scale reset in external reference mode). For SPI interfaces, the LTC2636 series offers similar functionality but requires interface adaptation.