Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
EE Times-Asia > Controls/MCUs

ADI MicroConverters rev processing capacity

Posted: 29 Apr 2003 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? flash microcontroller? 8052 microcontroller? micrconverter? aduc844?

Analog Devices Inc. has launched three additions to its MicroConverter family, devices that pair precision data converters with 8-bit 8052 flash microcontrollers for intelligent-sensor applications.

The AduC844, AduC845, and AduC846 offer higher resolution and 12 times greater processing capacity than their predecessors, ADI said. They incorporate 16- and 24-bit ADCs, whereas earlier versions were based on 12-bit converters. The products' 8052 core has been optimized to run at one clock cycle per instruction cycle instead of 12 clocks per instruction, said Brian O'Mara, applications manager for MicroConverter and instrumentation converter products at ADI, here.

O'Mara said MicroConverters are used in applications that call for precise measurement of low-frequency signals with a wide dynamic range. Examples include intelligent-sensor calibration and conditioning, smart transmitters, weigh scales, temperature and pressure transducers, 4mA to 20mA control loops, patient-monitoring equipment, and portable test-and-measurement gear.

The single-cycle 8052 flash microcontroller core common to all three new MicroConverters runs at up to 12.58MIPS and offers 8051 instruction-set compatibility. The memory section consists of on-chip code flash/EE memory space for in-circuit reprogrammability, a non-volatile R/W block of data memory space with security enhancements and 2,304 bytes of RAM.

The ADuC844 includes a 24-bit primary and a 16-bit auxiliary sigma-delta ADC while the AduC846 includes two 16-bit sigma-delta converters. The two offer 105Hz maximum A/D throughput. The AduC845 includes two 24-bit sigma-delta ADCs and a 10-channel (five-differential-channel) input mux. Its maximum throughput is 1.3kHz.

All three devices include a temperature sensor; a programmable-gain amplifier on the primary ADC to allow direct measurement of low-level signals; a 12-bit voltage output DAC; and dual PWM outputs. Two current sources, a reference and an oscillator are on board, and a phase-locked loop generates the 12.58MHz clock from a 32kHz crystal. UART, SPI, and I?C communications ports are included.

Chopping scheme

O'Mara noted that the primary and auxiliary ADCs in all three MicroConverters implement a patented chopping scheme that improves dc offset and offset-drift specifications.

Support tools available for the MicroConverters include QuickStart, an entry-level system for developing, debugging, and testing applications in assembly, and QuickStart Plus, which includes a C compiler, macro assembler, simulator, and real-time emulator.

The ADuC844 and ADuC846 are sampling now, while the ADuC845 is to sample in July. In 1,000-piece quantities, smaller-memory versions of the trio are priced at $8.45, $7.17, and $9.24, respectively. Each is available in an 8-by-8mm, 56-lead CSP and a 52-pin PQFP. QuickStart is priced at $75 and QuickStart Plus at $299.

EE Times

Article Comments - ADI MicroConverters rev processing c...
*? You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.

Back to Top