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Analogue MCUs pack 126Kb flash memory

Posted: 10 Feb 2010     Print Version  Bookmark and Share

Keywords:microcontroller  MCU  analogue  processor 

Analog Devices Inc. has revealed a pair of highly-integrated precision analogue microcontrollers, the ADuC7023 and ADuC7122 which use an ARM7 processor with up to 126KB of flash memory to ensure the accurate control of optical drivers and diagnostics.

Effective for digital diagnostics in optical transceivers and modules based on both fixed and tunable frequency lasers, the ADuC7023 and ADuC7122 precision analogue MCUs feature on-chip memory, data converters and other analogue peripherals that combine to deliver the highest level of programmability in the smallest package size. The new microcontrollers feature on-chip 12bit ADCs and DACs, which reduce the size of the overall solution by up to 75 per cent compared to competing discrete solutions. The devices support interrupt nesting and up to 16 levels of interrupt priority, and retain DAC and GPIO outputs during a software or watchdog reset, which are of particular benefit to optical module designers.

The ADuC7122 includes a 32bit ARM7TDMI processor core operating at 41.78MHz with 8KB of on-chip SRAM and 128KB of on-chip EEPROM memory with software-triggered in-circuit re-programmability. While competing devices use pulse-width modulators (PWMs) and lower performance ADCs to perform monitoring and control functions, the ADuC7122 microcontroller features a 13-channel, 12bit, 1-MSPS SAR (successive-approximation register) ADC, 12 buffered 12bit DACs, a programmable gain amplifier and an on-chip temperature sensor. This high level of precision component integration allows for the robust monitoring and control of key parameters in tunable optical modules, resulting in higher overall system performance. The integration and precision of the ADuC7122 eases the task for the system engineer, while versatile programmability allows multiple systems to use the same component.

The ADuC7122 also features five timers, including a wake-up timer and watchdog timer, as well as two I²C interfaces, one SPI, one UART and 32 GPIO signal pins that can be independently configured as inputs, outputs or open drain. All of this functionality is provided in a tiny 7mm x 7mm 108-ball BGA package.

For fixed-frequency optical transceivers in SFP, SFP+, XFP and GPON, the ADuC7023 offers 8KB of SRAM, 62KB of flash/EEPROM memory, 19 GPIO pins, three general-purpose timers and 16 programmable-logic elements. Analogue peripherals include a 12-channel, 12bit, 1-MSPS ADC, a 16bit, six-channel PWM and four buffered 12bit DACs. All of this functionality is provided in a tiny 5mm x 5mm 32-lead LFCSP.

The 13-channel ADuC7122, which operates at -10°C to +96°C is available for $8.90 each in 1,000-unit quantities. The 12-channel ADuC7023, which operates at -10°C to +125°C is available for Rs.168.55 ($3.65) each in 1,000-unit quantities.

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