LTC2656BCFE-H16#PBF

Overview

The LTC2656BCFE-H16#PBF is an octal 16-bit rail-to-rail digital-to-analog converter (DAC) from Analog Devices Inc. It features a precision integrated reference with a maximum temperature coefficient of 10ppm/°C and guarantees monotonicity over the operating temperature range. The device operates on a single supply voltage between 4.5V and 5.5V, providing a full-scale output of 4.096V when using the internal reference. Communication is handled via a 4-wire SPI/MICROWIRE compatible serial interface supporting clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity error of ±4LSB at 16 bits, a settling time of 7.9µs for 16-bit accuracy, and ultralow DAC-to-DAC crosstalk below 1nV•s.

Feature Summary

• Octal 16-bit resolution with guaranteed monotonicity over temperature
• Precise integrated reference with 10ppm/°C max temperature coefficient
• Rail-to-rail output buffers with 4.096V full-scale output span
• SPI/MICROWIRE compatible 4-wire serial interface with 50MHz clock rate

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Instrumentation
• Automatic Test Equipment
• Automotive Systems

Procurement Notes

Verify that the component matches the specific package type and temperature grade required for the application. Confirm that the power supply voltage remains within the specified 4.5V to 5.5V range to ensure proper operation of the H-option variant. Ensure that the PCB layout accounts for the exposed pad grounding requirements to maintain thermal performance and signal integrity.

Selection Notes

Select this part when eight independent 16-bit channels are required in a compact form factor. The H-suffix indicates a 4.096V full-scale output suitable for applications needing higher voltage swings compared to the L-option. Verify compatibility with the system's digital logic levels, as the serial interface is CMOS and TTL compatible. Consider the ±4LSB INL specification against the system's linearity requirements.

Part Context

This component belongs to the LTC2656 family of octal DACs, which also includes 12-bit variants and options with different full-scale voltages. The B-grade designation specifies a tighter integral nonlinearity tolerance of ±4LSB compared to the C-grade parts. The FE suffix identifies the 20-lead thermally enhanced TSSOP package, offering a smaller footprint than the QFN option while maintaining similar electrical characteristics.

Replacement Considerations

Direct replacements within the same family include the LTC2656BIUFD-H16#PBF for a QFN package or the LTC2656CCFE-H16#PBF if relaxed linearity specifications are acceptable. Ensure any substitute maintains the 4.5V minimum supply voltage requirement and the 16-bit resolution necessary for the design.

FAQ

How does the Power-On Reset (PORSEL) pin affect the initial state of the DAC outputs?

If the PORSEL pin is tied to GND, the DACs reset to zero-scale upon power-up. If tied to VCC, they reset to mid-scale.

What is the maximum clock rate for the serial interface?

The SPI/MICROWIRE compatible 4-wire serial interface operates at clock rates up to 50MHz.

Can the LTC2656BCFE-H16#PBF operate with an external reference?

Yes, each DAC can operate with an external reference connected to the REFIN/OUT pin, setting the full-scale output to two times the external reference voltage.