The MAX7651/MAX7652 are complete 12-bit data-acquisition systems featuring an algorithmic, switched-capacitor, analog-to-digital converter (ADC), a pulse- width-modulated digital-to-analog converter (DAC), three timer/counters, and an industry-standard 8051 microprocessor core with a variety of I/O peripherals. Power-down capability and full functionality with supply voltages as low as +3V make the MAX7651/MAX7652 suitable for portable and power-sensitive applications. The MAX7651/MAX7652 perform fully differential voltage measurements with 12-bit resolution, programmable gain, and separate track-and-hold for both positive and negative inputs. The converter accepts versatile input modes consisting of four 2-channel signal pairs or eight 1-channel signals relative to a floating common. The MAX7651/MAX7652 microprocessor systems feature a CPU, 256 bytes of RAM, two 8kB flash memory, four 8-bit I/O ports, two UARTs, an interrupt controller, and a watchdog timer. Only four clock cycles are required to complete each microprocessor instruction. The MAX7651/MAX7652 are available in 64-pin TQFP packages. Applications * Data Logging * Handheld Instruments (PDAs, Palmtops) * Multi-Channel Data-Acquisition with Data Formatting * Portable Data-Acquisition Systems * Smart Transmitters * Temperature Control * 12-Bit 53ksps ADC with Fully Differential Inputs * Dual 8-Bit PWM DAC Outputs * Three Timers * 4-Clock Cycle 8051-Compatible Instruction Set with Dual Data Pointers * Programmable Watchdog Supervisor * Four Parallel I/O Ports * Dual Serial I/O Ports (up to 375kb) * +3V or +5V Single-Supply Operation * DC to 12MHz Clock Speed * 64-Pin TQFP Package