Analog Devices Inc./Maxim Integrated MAX7652ECB

Overview

MAX7652ECB from Maxim Integrated is a flash-programmable, 12-bit integrated data-acquisition system combining an 8051-compatible microcontroller core, a fully differential 12-bit 53 ksps ADC, dual 8-bit PWM DAC outputs, three timers, two UARTs, and 16 kB on-chip flash (dual 8 kB banks) in a single 64-pin TQFP package. It operates from a +2.7V to +3.6V single supply and supports industrial temperature range (–40°C to +85°C), making it suitable for portable smart transmitters and multi-channel data loggers requiring low-voltage, mixed-signal autonomy.

For engineers reviewing the MAX7652ECB datasheet, MAX7652ECB pinout, MAX7652ECB application, or MAX7652ECB equivalent, key selection considerations include its 12-bit ADC differential linearity (±1.0 LSB INL), dual PWM DAC output capability, 4-clock-cycle 8051 instruction execution, internal flash memory architecture with lock-bit security, and analog/digital supply separation (AVDD/DVDD/PWMV).

Technical Context

The MAX7652ECB integrates an algorithmic switched-capacitor ADC with programmable gain, separate track-and-hold for positive/negative inputs, and configurable input modes (four 2-channel differential pairs or eight single-ended channels referenced to ACOM). Its ADC uses AVDD/2 as common-mode reference and accepts ±2.5V differential input range when VREF+ = +2.5V and VREF− = 0V.

The microcontroller subsystem features dual data pointers, four 8-bit I/O ports, interrupt controller, watchdog timer, and two serial ports supporting up to 375 kbps. Flash memory is organized into two independent 8 kB banks (0000H–1FFFH and 2000H–3FCH), each individually erasable and programmable via external hardware programming mode using P2.5–P2.7 control signals.

Key Specifications

Pinout & Package

MAX7652ECB is housed in a 64-pin Thin Quad Flat Package (TQFP) with exposed thermal pad (package code: ECB), optimized for surface-mount assembly and thermal dissipation in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar integrated data-acquisition microcontroller applications.

Compared with MAX7651ECB, MAX7652ECB delivers superior ADC linearity (±1.0 vs. ±1.5 LSB) and lower operating current, while ADuC7024 offers higher sampling speed but requires external components to replicate PWM functionality - making MAX7652ECB optimal for cost-sensitive, self-contained 8051-based control systems.

Availability

MAX7652ECB is available at Aetrix Electronics and suitable for portable data-acquisition systems, smart industrial transmitters, and battery-powered temperature controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX7652ECB 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 power-management ICs for industrial, medical, and communications applications, emphasizing integration, reliability, and low-power operation.

The MAX765x family was engineered as monolithic data-acquisition SoCs targeting portable and power-constrained instrumentation - merging high-resolution ADCs, programmable DACs, and enhanced 8051 cores to replace multi-chip solutions in smart sensors and edge controllers.

FAQ

What is the maximum clock frequency supported by MAX7652ECB?

The MAX7652ECB supports an external crystal or CMOS clock input up to 12 MHz, as confirmed in the Electrical Characteristics table under "External Clock Frequency." At this frequency, the 4-clock-cycle 8051 core achieves an effective instruction rate of 3 million instructions per second (MIPS), enabling tight real-time control loops. Operation above 12 MHz is not characterized or guaranteed.

Does MAX7652ECB support true differential ADC input mode?

Yes, MAX7652ECB supports fully differential input mode across AIN0–AIN7, with four dedicated 2-channel differential pairs (e.g., AIN0+/AIN1−, AIN2+/AIN3−). The ADC performs simultaneous track-and-hold on both inputs, and differential linearity is specified at ±1.0 LSB - verified in the Electrical Characteristics table under "Relative Accuracy (Differential)" for MAX7652.

How is flash memory organized in MAX7652ECB?

MAX7652ECB contains 16 kB of on-chip flash memory split into two independent 8 kB banks: lower bank (0000H–1FFFH) and upper bank (2000H–3FCH). Each bank can be erased and programmed separately using external hardware programming mode controlled by P2.5–P2.7 pins, enabling robust firmware update schemes without disrupting active code execution.

What are the supply voltage requirements for analog and digital sections of MAX7652ECB?

MAX7652ECB requires three separate supply rails: AVDD (+2.7V to +3.6V) for the ADC and analog circuitry, DVDD (+2.7V to +3.6V) for the digital core and I/O, and PWMV (+2.7V to +3.6V) for the PWM DAC outputs. All three must be within the same voltage range and are internally isolated to minimize noise coupling - per the Absolute Maximum Ratings and Electrical Characteristics tables.

Can MAX7652ECB operate from a single 3.3V supply?

Yes, MAX7652ECB is fully functional with a single 3.3V supply applied to AVDD, DVDD, and PWMV simultaneously. The datasheet specifies operation from +2.7V to +3.6V, and typical performance (e.g., 53.6 ksps conversion rate, ±1.0 LSB INL) is characterized at AVDD = DVDD = PWMV = +3.0V - confirming robustness across the 3.3V nominal rail with margin for variation.