Precision analog microcontrollers simplify optical module design

Analog Devices has introduced a pair of precision analog microcontrollers featuring on-chip memory, data converters, and other analog peripherals that the company claims combine to deliver the highest level of programmability and smallest package size.

Effective for digital diagnostics in optical transceivers and modules based on both fixed and tunable frequency lasers, the ADuC7023 and ADuC7122 precision analog microcontrollers use an ARM7 processor with up to 126 KB of flash memory to ensure the accurate control of optical drivers and diagnostics.

The new microcontrollers feature on-chip 12-bit ADCs (analog-to-digital converters) and DACs (digital-to-analog converters), which reduce the size of the overall solution by up to 75 percent 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 32-bit ARM7TDMI processor core operating at 41.78 MHz with 8 KB of on-chip SRAM and 128 KB 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 14-channel, 12-bit, 1-MSPS SAR (successive-approximation register) ADC, 12 buffered 12-bit DACs, a programmable gain amplifier and an on-chip temperature sensor. The 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 IC 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 7 mm x 7 mm 108-ball BGA (ball grid array) package.

For fixed frequency optical transceivers in SFP, SFP+, XFP and GPON, the ADuC7023 offers 8 KB of SRAM, 62 KB of flash/EEPROM memory, 19 general-purpose I/O (input/output) pins, three general-purpose timers and 16 programmable-logic elements. Analog peripherals include a 12-channel, 12-bit, 1-MSPS ADC, a 16-bit, 6-channel PWM and four buffered 12-bit DACs. All of this functionality is provided in a tiny 5 mm x 5 mm 32-lead LFCSP (lead frame chip scale package).

Features and Pricing

Product ADC DAC Memory Available Temp
Price Each
Per 1,000
ADuC7122 13-ch 12-bit ADC 12 buff. 12-bit DAC 8 KB SRAM;
126 KB Flash EE
NOW -10 to +95 degrees C $8.90
ADuC7023 12-ch 12-bit ADC 4 buff. 12-bit DAC 8 KB SRAM;
62 KB Flash EE
NOW -10 to +125 degrees C $3.65

Complementary components include the ADN2526 laser diode driver; ADP121 CMOS linear regulator; ADP2108 step-down DC-to-DC converter; ADP3050 switching regulator; and ADP3335 voltage regulator and ADIsimPower power management design tool.

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Analog Devices’ analog microcontrollers

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