Analog Devices Inc./Maxim Integrated MAX7652CCB

Overview

MAX7652CCB from Maxim Integrated is a flash-programmable, 12-bit integrated data-acquisition system combining an 8051-compatible microcontroller core, a fully differential 12-bit 53ksps ADC, dual 8-bit PWM DAC outputs, three timers, dual UARTs, and 16kB on-chip flash (two 8kB banks) in a single 64-pin TQFP package. It operates from a +2.7V to +3.6V single supply with AVDD = 3.0V and VREF+ = 2.5V, targeting portable instrumentation and low-power embedded sensing.

For engineers reviewing the MAX7652CCB datasheet, MAX7652CCB pinout, MAX7652CCB application, or MAX7652CCB equivalent, key selection considerations include its 12-bit differential ADC accuracy (±1.0 LSB INL), 4-clock-cycle 8051 instruction execution, ACOM-referenced analog input architecture, and support for multi-channel data logging with on-board signal conditioning and formatting.

Technical Context

The MAX7652CCB integrates an algorithmic switched-capacitor ADC with separate track-and-hold for positive/negative inputs and programmable gain, enabling fully differential voltage measurements across eight single-ended or four differential analog input pairs (AIN0–AIN7, ACOM). Its ADC uses AVDD/2 as common-mode reference and supports floating common configurations.

It implements a dual-data-pointer 8051 CPU core running at up to 12MHz with only four clock cycles per instruction, paired with two independent UARTs (up to 375kbps), three 16-bit timers (T0/T1/T2), a programmable watchdog, and flash memory organized as two 8kB banks (0000H–1FFFH and 2000H–3FCH) accessible via EA/VPP control and P2.5 bank select.

Key Specifications

Pinout & Package

MAX7652CCB is housed in a 64-pin Thin Quad Flat Package (TQFP) with 0.5mm pitch, thermally enhanced for stable operation in compact portable designs. Pin assignments are validated per Maxim's official datasheet Rev 0 (8/01).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX7651CCB and ADuC7024BCPZ-RL, the MAX7652CCB uniquely balances ultra-low-voltage operation (+2.7V), integrated PWM DACs, and drop-in 8051 firmware compatibility-making it optimal for cost-sensitive, battery-operated instrumentation where analog output generation and legacy code reuse are critical.

Availability

MAX7652CCB is available at Aetrix Electronics and suitable for hand-held instruments, portable data-acquisition systems, and temperature controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX7652CCB 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 semiconductor design and manufacturing company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.

The MAX7652CCB belongs to Maxim's integrated data-acquisition microcontroller product line, designed specifically to consolidate ADC, DAC, MCU, and timing peripherals into a single chip for portable and power-constrained embedded measurement systems.

FAQ

What is the maximum clock frequency supported by the MAX7652CCB?

The MAX7652CCB supports an external crystal or CMOS clock input up to 12MHz, enabling full-speed operation of its 4-clock-cycle 8051 core and 53.6ksps ADC conversion rate. The internal timing generator derives all peripheral clocks-including UART baud rates and timer prescalers-from this master clock, ensuring deterministic synchronization across analog and digital domains in the MAX7652CCB.

How does the ACOM pin function in the MAX7652CCB analog input architecture?

In the MAX7652CCB, the ACOM pin serves as the analog common reference for single-ended measurements, and must be biased at AVDD/2 to achieve the full ±1.25V input range with 2.5V reference. When used differentially (e.g., AIN0 vs. AIN1), ACOM is unused. This architecture allows flexible sensor interfacing-including ratiometric bridge circuits-while maintaining 12-bit linearity and ±1.0 LSB INL as specified in the MAX7652CCB datasheet.

Can the MAX7652CCB execute code directly from internal flash memory?

Yes, the MAX7652CCB executes code directly from its 16kB internal flash memory when the EA/VPP pin is tied high. The flash is organized as two independent 8kB banks (0000H–1FFFH and 2000H–3FCH), selectable via P2.5. This enables secure firmware partitioning, in-field updates without external memory, and lock-bit protection against unauthorized readback-core capabilities of the MAX7652CCB's embedded architecture.

What are the key differences between the MAX7652CCB and MAX7651CCB?

The MAX7652CCB operates from +2.7V to +3.6V with a 2.5V reference and ±1.0 LSB differential INL, while the MAX7651CCB requires +4.5V to +5.5V, uses a 5V reference, and has ±1.5 LSB INL. The MAX7652CCB also features lower active and stop-mode currents (13mA vs. 90mA active, 10µA vs. 20µA stop), making it optimized for battery-powered applications where the MAX7652CCB's power efficiency and reduced voltage headroom are decisive.

Does the MAX7652CCB support external memory expansion?

Yes, the MAX7652CCB supports up to 64kB of external program memory (ROM) and data memory (RAM) using standard 8051 addressing protocols. External access is enabled by asserting PSEN for program reads and RD/WR strobes (P3.7/P3.6) with multiplexed address/data on P0 and upper address bits on P2. This capability allows firmware overlays, large lookup tables, or buffered data storage beyond the 16kB internal flash-extending the functional scope of the MAX7652CCB in complex acquisition tasks.