Analog Devices Inc./Maxim Integrated MAX7651CCB

Overview

MAX7651CCB 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 of on-chip flash memory (two 8 kB banks). It operates from a single +3V or +5V supply and targets portable instrumentation requiring precision analog capture and embedded control.

For engineers reviewing the MAX7651CCB datasheet, MAX7651CCB pinout, MAX7651CCB application, or MAX7651CCB equivalent, this device serves as a self-contained mixed-signal SoC for battery-powered data loggers, smart transmitters, and hand-held test equipment where low-power operation, on-chip signal conditioning, and firmware-upgradable functionality are essential.

Technical Context

The MAX7651CCB integrates an algorithmic switched-capacitor ADC with programmable gain and separate track-and-hold for fully differential inputs, supporting four 2-channel differential pairs or eight single-ended channels referenced to ACOM. Its 8051 CPU executes instructions in just four clock cycles-2.5× faster than standard 8051 cores-at up to 12 MHz.

It features dual independent PWM DAC outputs (PWMA/PWMB), three 16-bit timers (T0/T1/T2) with capture/compare capability, a programmable watchdog timer, and dual serial ports supporting up to 375 kbps. Memory architecture includes 256 bytes of RAM, 16 kB flash (0000H–1FFFH lower bank, 2000H–3FCH upper bank), and external memory interface support.

Key Specifications

Pinout & Package

MAX7651CCB is housed in a 64-pin Thin Quad Flat Package (TQFP) with exposed thermal pad, optimized for compact PCB layouts and moderate power dissipation (500 mW at +70°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX7652CCB, the MAX7651CCB offers higher supply tolerance and simplified +5V design, while ADS8320IPW trades integration for resolution-making MAX7651CCB optimal for cost-sensitive, space-constrained embedded DAQ where 12-bit accuracy suffices.

Availability

MAX7651CCB is available at Aetrix Electronics and suitable for hand-held instruments, portable data-acquisition systems, and temperature controllers requiring stable component supply and long-term manufacturability.

Supply support for MAX7651CCB 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.

The MAX7651CCB belongs to Maxim's integrated data-acquisition SoC product line, engineered to replace multi-chip solutions in portable and power-sensitive measurement systems with a single flash-programmable device.

FAQ

What is the maximum clock frequency supported by the MAX7651CCB?

The MAX7651CCB supports an external crystal or clock input from 1 MHz to 12 MHz. At 12 MHz, its 4-clock-cycle 8051 core achieves approximately 3 MIPS performance. The minimum frequency for internal flash programming is 4 MHz, as specified in the datasheet timing notes.

Does the MAX7651CCB support true differential ADC operation?

Yes, the MAX7651CCB supports fully differential voltage measurements across AIN0–AIN7 with separate track-and-hold for both positive and negative inputs. It accepts four 2-channel differential pairs (e.g., AIN0/AIN1) or eight single-ended channels relative to ACOM, with ±1.5 LSB INL in differential mode per the electrical characteristics table.

Can the MAX7651CCB operate from a single +3V supply?

Yes, the MAX7651CCB supports single-supply operation at either +3V or +5V. At +3V, it uses internal regulation and biasing optimized for low-voltage analog performance-including a 2.5V reference and AVDD/2 ACOM setting-while maintaining full 12-bit ADC functionality and 53 ksps throughput.

How is flash memory organized in the MAX7651CCB?

The MAX7651CCB contains 16 kB of on-chip flash memory divided into two independent 8 kB banks: lower bank (0000H–1FFFH) and upper bank (2000H–3FCH). EA/VPP controls execution source, and P2.5 selects between banks during external programming-enabling safe in-application updates without erasing active firmware.

What are the key differences between MAX7651CCB and MAX7652CCB?

The MAX7651CCB is rated for +4.5V to +5.5V analog/digital supplies and a 0°C to +70°C temperature range, while the MAX7652CCB operates from +2.7V to +3.6V with a +2.5V reference and extends to -40°C to +85°C. Both share identical pinout, firmware compatibility, and peripheral sets-but differ in supply voltage, reference, and temperature grading.