MCP4802-E/MS

Digital To Analog Converters Overview

The MCP4802-E/MS is a dual-channel, 8-bit buffered voltage output Digital-to-Analog Converter (DAC) manufactured by Microchip Technology. It operates on a single supply voltage ranging from 2.7V to 5.5V and features an SPI-compatible serial interface supporting clock frequencies up to 20 MHz. The device includes a high-precision internal voltage reference of 2.048V with selectable unity or 2x gain outputs. Key electrical specifications include a typical settling time of 4.5 µs, rail-to-rail output capability, and an operating temperature range from -40°C to +125°C. It is housed in an 8-lead Mini Small Outline Package (MSOP).

Digital To Analog Converters Feature Summary

• Dual-channel architecture with simultaneous latching via the LDAC pin for synchronized updates.
• Integrated 2.048V internal voltage reference with low noise and temperature coefficient characteristics.
• Configurable output gain allowing full-scale ranges of either 2.048V or 4.096V.
• Individual channel shutdown mode reduces power consumption while maintaining active serial interface.

Digital To Analog Converters Applications

• Set point or offset trimming in industrial control systems.
• Sensor calibration for temperature, pressure, and humidity signals.
• Precision selectable voltage reference generation.
• Portable instrumentation powered by battery sources.
• Calibration of optical communication devices.

Digital To Analog Converters Procurement Notes

Verify the specific ordering suffix '-E/MS' to confirm the MSOP package type and extended temperature grade. Ensure compatibility with system voltage requirements between 2.7V and 5.5V. Confirm that the SPI interface modes (Mode 0,0 or Mode 1,1) align with the host microcontroller configuration. Check for moisture sensitivity levels if reflow soldering is required.

Digital To Analog Converters Selection Notes

Select this component when dual-channel 8-bit resolution is sufficient for the application's accuracy needs. Consider the MCP4812 or MCP4822 variants if higher resolution (10-bit or 12-bit) is required. Evaluate the power consumption constraints, as the device draws approximately 415 µA in active mode. Verify that the MSOP package dimensions fit the available PCB space compared to PDIP or SOIC alternatives.

Digital To Analog Converters Part Context

This part belongs to the MCP4802/4812/4822 product family, which shares identical pinouts and functional interfaces but varies in resolution. The MCP4802 specifically provides 8-bit resolution, whereas the MCP4812 offers 10-bit and the MCP4822 provides 12-bit resolution. All members utilize a resistive string architecture and feature the same internal 2.048V reference and SPI communication protocol.

Digital To Analog Converters Replacement Considerations

MCP4802T-E/MS: Identical functionality with tape-and-reel packaging instead of tube.

Digital To Analog Converters FAQ

How does the Power-on Reset (POR) circuit affect the initial state of the DAC outputs?

The POR circuit ensures that upon power-up, the DAC outputs remain in a high-impedance state until a valid write command is received and the LDAC pin meets the input low threshold, preventing unintended analog output transitions.

What is the behavior of the output amplifier during Shutdown mode?

In Shutdown mode, most internal circuits are turned off to save power. The output amplifier is configured to present a known high-resistance load, typically 500 kΩ, to the external circuit.

Can the two DAC channels be updated simultaneously?

Yes, the device includes double-buffered registers and an LDAC pin. Driving the LDAC pin low transfers the contents of the input latch registers to the output DAC registers simultaneously for both channels.