MCP4822-E/SN

Overview

The MCP4822-E/SN is a dual-channel, 12-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 internal 2.048V voltage reference with a typical temperature coefficient of 50 ppm/°C. The device utilizes a resistive string architecture and communicates via an SPI-compatible serial interface supporting clock frequencies up to 20 MHz. Key electrical specifications include a typical settling time of 4.5 µs, integral non-linearity (INL) of ±2 LSB, and differential non-linearity (DNL) of ±0.75 LSB. It supports selectable unity or 2x gain outputs, allowing full-scale ranges of 2.048V or 4.096V respectively.

Feature Summary

• Dual-channel architecture with simultaneous latching capability using the LDAC pin for synchronized output updates.
• Rail-to-rail output amplifiers providing high drive capability and low noise performance.
• Integrated power-on reset circuitry ensuring reliable startup states.
• Individual channel shutdown modes that reduce power consumption by disconnecting internal circuits.

Applications

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

Procurement Notes

Verify the specific suffix 'E' indicates automotive qualification standards if required by your design specifications. Confirm the 'SN' suffix corresponds to the SOIC-8 package dimensions and thermal characteristics. Ensure the ordering quantity matches the manufacturer's tube packaging requirements. Cross-reference the datasheet revision number to confirm compatibility with your system's timing constraints.

Selection Notes

Select this component when dual-channel synchronization is critical for minimizing transient glitches between outputs. The internal reference simplifies board layout compared to external reference designs. Consider the 20 MHz SPI speed for high-throughput applications. Evaluate the 4.5 µs settling time against your system's update rate requirements. Verify that the 2.7V minimum supply voltage aligns with your available power rails.

Part Context

The MCP4822-E/SN belongs to the MCP48X2 product family, which includes 8-bit (MCP4802) and 10-bit (MCP4812) variants. These devices share identical pinouts, interfaces, and general electrical characteristics, differing primarily in resolution and associated linearity errors. Single-channel versions are available as the MCP4821. This family is designed for cost-sensitive consumer and industrial applications requiring moderate precision.

Replacement Considerations

Direct functional substitutes within the same family include the MCP4812-E/SN (10-bit) and MCP4802-E/SN (8-bit). For higher resolution needs, consider the MCP4922 series, though it requires an external voltage reference. Ensure any replacement maintains the SOIC-8 footprint and SPI compatibility without altering the control register bit definitions.

FAQ

How does the LDAC pin affect output synchronization?

The LDAC pin transfers data from the input registers to the DAC output registers. When held low, both channels update simultaneously. If tied to ground, updates occur on the rising edge of the CS pin, ensuring synchronized changes across both channels.

What is the impact of the Shutdown mode on the output impedance?

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, effectively disconnecting the output from the active signal path.

Can the MCP4822 operate with an external voltage reference?

No, the MCP4822 uses an internal 2.048V voltage reference. External reference options are available in the MCP49XX series, which feature dedicated VREF pins for external reference inputs.