MicroConverter 12-Bit ADCs and DACs with
Embedded High Speed 62 kB Flash MCU
Pin compatible upgrade of ADuC812/ADuC831/ADuC832
Single-cycle 20 MIPS 8052 core
High speed 420 kSPS 12-bit ADC
Up to 62 kBytes on-chip Flash/EE program memory
4 kBytes on-chip Flash/EE data memory
Flash/EE, 100 year retention, 100 kCycle endurance
2304 bytes on-chip data RAM
8 mm × 8 mm chip scale package
52-lead PQFP—pin-compatible upgrade
8-channel, 420 kSPS high accuracy, 12-bit ADC
On-chip, 15 ppm/°C voltage reference
DMA controller, high speed ADC-to-RAM capture
Two 12-bit voltage output DACs1
Dual output PWM ∑-∆ DACs
On-chip temperature monitor function
8052 based core
8051 compatible instruction set (20 MHz max)
High performance single-cycle core
32 kHz external crystal, on-chip programmable PLL
12 interrupt sources, 2 priority levels
Dual data pointers, extended 11-bit stack pointer
Time interval counter (TIC)
UART, I2C®, and SPI® Serial I/O
Watchdog timer (WDT)
Power supply monitor (PSM)
Normal: 4.5 mA @ 3 V (core CLK = 2.098 MHz)
Power-down: 10 µA @ 3 V2
Low cost, comprehensive development system
incorporating nonintrusive single-pin emulation,
IDE based assembly and C source debugging
Optical networking—laser power control
Base station systems
Precision instrumentation, smart sensors
Transient capture systems
DAS and communications systems
1 ADuC841/ADuC842 only.
2 ADuC842/ADuC843 only, ADuC841 driven directly by external crystal.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
FUNCTIONAL BLOCK DIAGRAM
20 MIPS 8052 BASED MCU WITH ADDITIONAL
62 kBYTES FLASH/EE PROGRAM MEMORY
4 kBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
3 × 16 BIT TIMERS POWER SUPPLY MON
1 × REAL TIME CLOCK WATCHDOG TIMER
4 × PARALLEL
UART, I2C, AND SPI
The ADuC841/ADuC842/ADuC8431 are complete smart
transducer front ends, that integrates a high performance self-
calibrating multichannel ADC, a dual DAC, and an optimized
single-cycle 20 MHz 8-bit MCU (8051 instruction set compatible)
on a single chip.
The ADuC841 and ADuC842 are identical with the exception
of the clock oscillator circuit; the ADuC841 is clocked directly
from an external crystal up to 20 MHz whereas the ADuC842
uses a 32 kHz crystal with an on-chip PLL generating a
programmable core clock up to 16.78 MHz.
The ADuC843 is identical to the ADuC842 except that the
ADuC843 has no analog DAC outputs.
The microcontroller is an optimized 8052 core offering up to
20 MIPS peak performance. Three different memory options
are available offering up to 62 kBytes of nonvolatile Flash/EE
program memory. Four kBytes of nonvolatile Flash/EE data
memory, 256 bytes RAM, and 2 kBytes of extended RAM are
also integrated on-chip.
1 Protected by U.S. Patent No. 5,969,657.
(continued on page 23)
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