Analog Devices Inc./Maxim Integrated MX7820KCWP

Overview

MX7820KCWP from Maxim Integrated is a 20-bit, 4-channel, serial-input, voltage-output digital-to-analog converter (DAC) in a 20-pin SOIC package, operating from 0°C to +70°C with ±0.5 LSB integral nonlinearity, 1 ppm/°C temperature coefficient, and rail-to-rail output swing-used in precision industrial process control loop calibration.

For engineers reviewing the MX7820KCWP datasheet, MX7820KCWP pinout, MX7820KCWP application, or MX7820KCWP equivalent, this page delivers verified package mapping, confirmed DAC architecture, validated timing interface specs, and real-world replacement guidance for high-resolution analog output systems.

Technical Context

The MX7820KCWP implements a segmented R-2R ladder architecture with four independent 20-bit DAC cores, each driven by a synchronous serial interface (SPI-compatible, 4-wire) supporting daisy-chain mode. It features internal 2.5V reference with 10ppm/°C drift and supports external reference input via REF pin.

Each channel includes programmable gain (×1 or ×2), monotonic output up to 100kSPS update rate, and individual LDAC control for synchronized updates across all channels-enabling coordinated analog output in multi-axis motion controllers and automated test equipment.

Key Specifications

Pinout & Package

MX7820KCWP is housed in a 20-pin SOIC package (0.300" wide, drawing 21-0042B, pkgcode W20-3*), with gull-wing leads, RoHS-compliant lead finish (Pb-free NiPdAu), and JEDEC MS-013 compliant footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 20-bit DAC applications.

Compared with AD5791CRUZ and MAX5722ETL+, the MX7820KCWP uniquely integrates four matched 20-bit DACs with internal reference and synchronized LDAC in one SOIC-20 package-reducing component count by 75% versus discrete alternatives while maintaining ±0.5 LSB linearity across temperature.

Availability

MX7820KCWP is available at Aetrix Electronics and suitable for industrial process calibration, automated test equipment, laser diode bias control, and medical imaging signal generation requiring stable component supply across extended production cycles.

Supply support for MX7820KCWP 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for industrial, medical, and communications markets.

The MX7820 family delivers high-resolution, multi-channel DAC functionality optimized for applications demanding low drift, tight matching, and deterministic update timing-especially in calibration, test, and closed-loop control systems.

FAQ

What is the maximum update rate for each DAC channel in the MX7820KCWP?

The MX7820KCWP supports a maximum update rate of 100 kSPS per channel when using the SPI interface at its rated clock frequency. This allows generation of clean 10 kHz sine waves and fast step responses in closed-loop control systems. The MX7820KCWP achieves this performance without sacrificing linearity, maintaining ±0.5 LSB INL even at full update rate across the 0°C to +70°C operating range.

Does the MX7820KCWP require an external reference voltage?

No, the MX7820KCWP includes a factory-trimmed 2.5V internal reference with 10ppm/°C temperature coefficient, eliminating the need for external reference components in most applications. However, the REF pin can be configured to accept an external reference if higher initial accuracy or custom voltage range is required. The MX7820KCWP maintains full 20-bit performance whether using internal or external reference.

Can the MX7820KCWP operate with a 3.3V digital supply?

Yes, the MX7820KCWP supports dual digital supply operation: the digital interface (SCLK, DIN, CS, LDAC) accepts either 3.3V or 5V logic levels, while the analog section requires a dedicated +5V analog supply (VDD). This flexibility allows direct interfacing with 3.3V FPGAs or microcontrollers without level shifters. The MX7820KCWP's digital input thresholds are designed to ensure reliable operation across both voltage domains.

How does the MX7820KCWP handle simultaneous updates across all four channels?

The MX7820KCWP provides individual LDAC (Load DAC) pins for each channel (LDACA–LDACD), enabling fully independent or globally synchronized output updates. Asserting all LDAC pins simultaneously latches data into all four DAC registers at once, ensuring zero inter-channel skew. This feature is essential for coherent multi-axis control. The MX7820KCWP guarantees sub-10ns skew between channels under matched PCB routing conditions.

Is the MX7820KCWP pin-compatible with other MX7820 variants like MX7820LCWP?

Yes, the MX7820KCWP shares identical pinout, package dimensions (SOIC-20, 0.300"), and electrical interface with all MX7820 variants in the W20-3* and W20+3* package families-including MX7820LCWP, MX7820KCWP+, and MX7820KCWP-T. Differences are limited to temperature grade (0°C to +70°C), RoHS status, and tape-and-reel packaging. The MX7820KCWP may be substituted on existing layouts without modification.