Analog Devices Inc./Maxim Integrated MX7820LCWP

Overview

MX7820LCWP from Maxim Integrated is a 12-bit, 8-channel successive-approximation analog-to-digital converter (ADC) with internal track/hold and reference, housed in a 20-pin SOIC package operating from 0°C to +70°C. It supports single-ended inputs, ±5V analog input range, and serial interface output compatible with SPI/QSPI/MICROWIRE protocols. It is used in industrial data acquisition systems requiring moderate-speed precision conversion.

For engineers reviewing the MX7820LCWP datasheet, MX7820LCWP pinout, MX7820LCWP application, or MX7820LCWP equivalent, key selection considerations include its 12-bit resolution, 100 kSPS sampling rate, on-chip 2.5V reference, unipolar/bipolar input configuration support, and SOIC-20 RoHS-compliant packaging for space-constrained PCB layouts.

Technical Context

The MX7820LCWP implements a successive-approximation register (SAR) architecture with integrated sample-and-hold and voltage reference, eliminating external components for basic operation. It uses a serial 3-wire interface for data readout and control, supporting both MSB-first and LSB-first modes with programmable clock polarity and phase.

It features internal clock generation, allowing operation with a single external clock source or crystal oscillator. Input channel selection is controlled via three address bits (A2–A0), enabling multiplexed access to eight analog inputs without external MUX hardware.

Key Specifications

Pinout & Package

MX7820LCWP is packaged in a 20-pin SOIC (Small Outline Integrated Circuit), 0.300-inch body width, RoHS-compliant, with standard JEDEC MO-002AC footprint and thermal pad omitted.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, multi-channel SAR ADC applications.

Compared with ADS7822U and MAX11126ETE+, the MX7820LCWP offers balanced performance with integrated reference and track/hold in a mature SOIC package - ideal for cost-sensitive, space-constrained industrial upgrades where layout reuse matters.

Availability

MX7820LCWP is available at Aetrix Electronics and suitable for industrial sensor interface, process control monitoring, and embedded data logger applications requiring stable component supply and long-term manufacturability.

Supply support for MX7820LCWP 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MX7820 family was designed for general-purpose, medium-speed data acquisition in commercial-grade instrumentation and control systems - emphasizing integration, ease of use, and robustness across varied analog signal sources.

FAQ

What is the maximum sampling rate of the MX7820LCWP?

The MX7820LCWP achieves a maximum sampling rate of 100 kSPS under specified conditions (V_DD = +5V, T_A = 0°C to +70°C). This rate assumes optimal serial clock timing and minimal inter-conversion delay. The MX7820LCWP maintains full 12-bit accuracy at this speed, making it suitable for monitoring slowly varying physical parameters such as temperature, pressure, and position in industrial environments.

Does the MX7820LCWP require an external reference voltage?

No, the MX7820LCWP includes an internal 2.5V reference with ±0.5% initial accuracy and 25 ppm/°C temperature drift, sufficient for 12-bit linearity without external components. However, the MX7820LCWP allows optional use of an external reference applied to the V_REF pin if higher precision or custom scaling is needed. The internal reference remains enabled by default unless overridden.

Which microcontrollers are compatible with the MX7820LCWP serial interface?

The MX7820LCWP supports SPI, QSPI, and MICROWIRE-compatible serial protocols with programmable clock polarity and phase, enabling direct connection to most ARM Cortex-M, PIC, AVR, and MSP430 microcontrollers featuring standard SPI peripherals. Its 3-wire interface (CS, DIN, DOUT, CLK) requires no protocol translation, and the MX7820LCWP operates reliably with clock frequencies up to 2.5 MHz.

Can the MX7820LCWP operate in bipolar input mode?

Yes, the MX7820LCWP supports bipolar input operation (±5V full-scale) by grounding the REF pin and supplying –5V to V_SS. In this configuration, the MX7820LCWP digitizes differential inputs centered around 0V. The device retains its 12-bit resolution and monotonicity across the full range, making it suitable for applications like motor current sensing and audio-level monitoring where bidirectional signals occur.

Is the MX7820LCWP RoHS-compliant?

The MX7820LCWP is not RoHS-compliant in its base configuration, as indicated by the absence of '+' suffix in the part number. RoHS-compliant versions include MX7820LCWP+ and MX7820LCWP+T. The MX7820LCWP uses leaded solder finish and contains lead per exemption 7a (high-melting-temperature solder), consistent with commercial-grade SOIC packaging standards prior to full RoHS enforcement.