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MCU boasts precision analog conversion

Posted: 14 Apr 2006 ?? ?Print Version ?Bookmark and Share

Keywords:ADuC7128? microcontroller? MCU? Analog Devices? ADC?

In a move to differentiate itself in the exploding ARM-based microcontroller (MCU) sweepstakes, Analog Devices Inc. (ADI) is employing its precision analog conversion technology for its newest family of application-specific MCUs.

The ADuC7128 MCU features a 44MIPS 32bit ARM7TDMI core, 12bit, 1MSPS ADC and 126Kbytes of embedded flash memory. In addition to the 6-channel pulse-width modulator (PWM) and quadrature encoder, the MCU provides I/V control, making it applicable to a variety of motor control applications. The PWMs can also be used as general purpose 16bit PWMs to provide additional DAC outputs, high frequency clocks or set point control, for example.

For smart-sensing applications, the ADuC7128 features a 32bit on-chip DDS that operates at 21MHz. This feature enables smart sensor applications with a minimum frequency range of 4.8MHz, while an integrated low pass filter ensures a clean signal. A 100-ohm driver at the DDS output is controlled by the microprocessor core and analog front end. Additionally, the ADuC7128 integrates other analog functionality, including a comparator, temperature sensor, PLA and several communications ports including two UARTs, further reducing cost, board space and development time.

"Two years ago, we addressed a strong customer demand for high-performance data converters with embedded processing power," said Mike Britchfield, product line director, precision signal processing group, ADI. "We responded with an ARM7-based family of general-purpose precision analog MCUs that met the performance, size and processing requirements of applications ranging from medical instrumentation to optical transceivers.

The ADuC7128 is sampling now with full production scheduled for late summer. The device is priced at $6.95 per unit in 1,000-unit quantities in a 9-by-9mm 64-LFCSP (lead-frame chip-scale package) and is specified over an operating temperature range of -40C to 85C. The product also comes with an 80-pin LQFP (low profile quad flat pack) option. It is offered at $7.75 in 1,000-piece quantities, and will be sampling in September.

- Marty Gold

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