Microchip Technology MCP4822T-E/SN

Overview

MCP4822T-E/SN from Microchip Technology is a dual 12-bit buffered voltage-output DAC with internal 2.048V reference, rail-to-rail output amplifiers, and SPI interface supporting up to 20 MHz clock. It delivers ±4 LSb INL (typ), 4.5 µs settling time, and selectable 1x/2x gain for full-scale ranges of 2.048V or 4.096V. Used in precision sensor calibration and portable instrumentation requiring stable, low-noise analog outputs.

For engineers reviewing the MCP4822T-E/SN datasheet, MCP4822T-E/SN pinout, MCP4822T-E/SN application, or MCP4822T-E/SN equivalent, key selection criteria include guaranteed monotonicity, extended temperature operation (–40°C to +125°C), simultaneous dual-DAC latching via LDAC, software shutdown capability, and MSOP-8 package compatibility with SOIC-8 and PDIP-8 footprints.

Technical Context

The MCP4822T-E/SN employs a resistive string DAC architecture ensuring low DNL (±0.25 LSb typ), low ratio-metric temperature coefficient, and fast settling. Its double-buffered registers enable synchronous updates of both DAC outputs using the LDAC pin, while Power-on Reset (POR) ensures reliable initialization at VDD > 1.85V.

Each channel features independent software-controllable shutdown mode (3.3–6 µA typical shutdown current), programmable gain (1x or 2x via GA bit), and rail-to-rail output swing (0.01 V to VDD – 0.04 V). The internal 2.048V reference exhibits 125 ppm/°C max tempco over –40°C to 0°C and 45 ppm/°C over 0°C to +85°C.

Key Specifications

Pinout & Package

Package: 8-pin MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), also available in SOIC-8 and PDIP-8. Pin-compatible across MCP48X2 family.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel DAC applications.

Compared with MCP4822-E/SN, the MCP4822T-E/SN offers identical performance in tape-and-reel format for volume SMT production; versus MCP4922-E/SN, it trades external reference flexibility for integrated simplicity and lower BOM count in cost-sensitive, space-constrained designs.

Availability

MCP4822T-E/SN is available at Aetrix Electronics and suitable for sensor calibration, portable instrumentation, and optical communication calibration requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for MCP4822T-E/SN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and connectivity solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP48X2 family-including MCP4822T-E/SN-is designed for precision analog output in embedded systems where integration, low power, and extended temperature reliability are critical, especially in industrial sensing and calibration.

FAQ

What is the maximum SPI clock frequency supported by the MCP4822T-E/SN?

The MCP4822T-E/SN supports SPI clock frequencies up to 20 MHz at +25°C, compliant with SPI Modes 0,0 and 1,1. At extended temperatures (–40°C to +125°C), timing margins remain sufficient for robust operation at this rate, with minimum clock high/low times specified at 15 ns. This allows high-speed configuration in real-time control loops without bottlenecking the host MCU's SPI peripheral.

Does the MCP4822T-E/SN require an external reference voltage?

No, the MCP4822T-E/SN includes a factory-trimmed internal 2.048V voltage reference with 50 ppm/°C typical temperature coefficient. It does not require an external reference unless the application demands a different full-scale voltage or superior stability-e.g., when using the MCP4922-E/SN variant, which lacks internal VREF and relies on external sources.

How does the LDAC pin function in the MCP4822T-E/SN?

The LDAC (Latch DAC) pin on the MCP4822T-E/SN controls synchronous updating of both DAC outputs. When pulled low, it transfers data from the input latch registers to the output DAC registers, causing simultaneous VOUTA and VOUTB transitions. If tied to VSS, updates occur automatically at the rising edge of CS; if driven by an MCU, it enables precise timing control for phase-aligned dual-channel operation.

What is the output impedance of the MCP4822T-E/SN in shutdown mode?

In software shutdown mode, each DAC channel (VOUTA or VOUTB) presents a known high-resistance load of 500 kΩ (typical) to the external circuit. This behavior is explicitly defined in the datasheet and ensures predictable, non-intrusive disconnection-unlike floating outputs-which prevents loading or interference with downstream circuitry during power-saving states.

Can the MCP4822T-E/SN operate from a 3.3V supply?

Yes, the MCP4822T-E/SN is fully specified for operation from 2.7V to 5.5V, including standard 3.3V logic rails. At 3.3V, its rail-to-rail output swing remains functional (0.01 V to 3.26 V), and the internal 2.048V reference maintains accuracy. Full-scale output with 2x gain is 4.096V-but since that exceeds VDD, the actual maximum output is clamped to VDD – 0.04 V (≈3.26 V), preserving safe operation.