LTC2642CMS-16#PBF

Overview

The LTC2642CMS-16#PBF is a 16-bit unbuffered voltage output digital-to-analog converter (DAC) from Analog Devices. It operates on a single 2.7V to 5.5V supply with a typical current consumption of 120µA. The device features a 3-wire SPI/MICROWIRE compatible serial interface supporting clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) of ±1 LSB and differential nonlinearity (DNL) of ±1 LSB over temperature, ensuring monotonic operation. The DAC settles to 16-bit accuracy within 1µs. This specific variant includes matched internal scaling resistors for bipolar output configurations using an external op-amp.

Feature Summary

• 16-bit resolution with guaranteed monotonicity and ±1LSB INL/DNL over temperature
• Unbuffered voltage output with low offset error of ±1LSB and 120µA supply current
• Integrated bipolar scaling resistors (RFB/INV) for generating ±VREF outputs
• Power-on reset circuit initializes the DAC output to midscale

Applications

• Process control and industrial automation systems
• Automatic test equipment requiring high precision
• Data acquisition systems with bipolar signal requirements

Procurement Notes

Verify the package type matches the design requirements, as this component is available in both MSOP and DFN formats. Confirm that the commercial temperature range (0°C to 70°C) aligns with the system's environmental constraints. Ensure the external operational amplifier selected for bipolar applications meets the bandwidth and noise specifications required by the DAC's performance characteristics.

Selection Notes

Select the LTC2642CMS-16#PBF when bipolar output capability is required, distinguishing it from the unipolar LTC2641 series. The 'C' suffix indicates the commercial temperature grade; use the 'I' suffix for industrial ranges (-40°C to 85°C). Verify that the load impedance connected to VOUT exceeds 60kΩ to maintain linearity specifications, or account for gain error if driving lower impedances directly.

Part Context

This part belongs to the LTC2641/LTC2642 family of micropower DACs. The LTC2642 variant is specifically designed for bipolar applications through its internal resistor network, whereas the LTC2641 provides unipolar output only. Both families share identical serial interface protocols and power management features, allowing for flexible system design across different voltage swing requirements.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source documentation.