Electronic Design

Integrated Data-Acquisition Chips Embed Flash Memories In Microcontrollers

Two new members of the MicroConverter line of system-level data-acquisition chips feature an 8-bit 8051-compatible microcontroller core, program and data flash memories, and a host of peripherals.

While the ADuC834 is a dual, 16/24-bit precision converter for demanding industrial applications, the 12-bit ADuC814 targets space-critical, low-cost designs. On-board peripherals for both chips include a temperature sensor, a precision voltage reference, a power supply monitor, a time-interval counter, a watchdog timer, timers/counters, and three serial I/O ports.

The ADuC814 includes a six-channel, 247-ksample/s, 12-bit analog-to-digital converter (ADC) and dual 12-bit voltage-output digital-to-analog converters (DACs). It has 8 kbytes of nonvolatile program flash memory, 640 bytes of data EEPROM memory, and 256 bytes of RAM.

The ADuC834 implements on-chip 16- and 24-bit ADCs with 62 kbytes of program flash memory, 4 kbytes of data EEPROM memory, and 256 bytes of data RAM ex-tendible to 2 kbytes. It also has a 12-bit voltage-output DAC and two 16-bit delta-sigma DACs.

Both devices use an on-chip phase-locked loop to generate a high-frequency clock from an external 32-kHz crystal. Implemented in 0.5-µm CMOS, the MicroConverters operate from a 3- or 5-V supply. They're supported by a Windows-based QuickStart development system. The ADuC814 is housed in a 28-lead TSSOP, and the ADuC834 comes in a 52-lead PQFP.

In 1000-piece lots, the ADuC814 costs $4.50, and the ADuC834 costs $12.50.

Analog Devices Inc., www.analog.com; (781) 937-1428, (800) 262-5643.

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