MicroConverter® Multichannel
24-/16-Bit ADCs with Embedded 62 kB
Flash and Single-Cycle MCU
Data Sheet
ADuC845/ADuC847/ADuC848
Power
FEATURES
High resolution Σ-Δ ADCs
2 independent 24-bit ADCs on the ADuC845
Single 24-bit ADC on the ADuC847 and
single 16-bit ADC on the ADuC848
Normal: 4.8 mA max @ 3.6 V (core CLK = 1.57 MHz)
Power-down: 20 µA max with wake-up timer running
Specified for 3 V and 5 V operation
Package and temperature range:
Up to 10 ADC input channels on all parts
24-bit no missing codes
52-lead MQFP (14 mm × 14 mm), −40°C to +125°C
56-lead LFCSP (8 mm × 8 mm), −40°C to +85°C
22-bit rms (19.5 bit p-p) effective resolution
Offset drift 10 nV/°C, gain drift 0.5 ppm/°C chop enabled
APPLICATIONS
Multichannel sensor monitoring
Memory
Industrial/environmental instrumentation
Weigh scales, pressure sensors, temperature monitoring
Portable instrumentation, battery-powered systems
Data logging, precision system monitoring
62-kbyte on-chip Flash/EE program memory
4-kbyte on-chip Flash/EE data memory
Flash/EE, 100-year retention, 100 kcycle endurance
3 levels of Flash/EE program memory security
In-circuit serial download (no external hardware)
High speed user download (5 sec)
FUNCTIONAL BLOCK DIAGRAM
AVDD
2304 bytes on-chip data RAM
ADuC845
AVCO
IEXC1
IEXC2
CURRENT
SOURCE
8051-based core
AIN1
8051-compatible instruction set
High performance single-cycle core
32 kHz external crystal
PRIMARY
24-BIT S-D ADC
BUF
PGA
12-BIT
DAC
DAC
BUF
MUX
AGND
On-chip programmable PLL (12.58 MHz max)
3 × 16-bit timer/counter
AIN10
DUAL 16-BIT
S-D DAC
PWM0
PWM1
AUXILIARY
24-BIT S-D ADC
AINCOM
MUX
TEMP
SENSOR
DUAL 16-BIT
PWM
24 programmable I/O lines, plus 8 analog or
digital input lines
REFIN2+
REFIN2–
11 interrupt sources, two priority levels
Dual data pointer, extended 11-bit stack pointer
REFIN–
REFIN+
EXTERNAL
VREF
DETECT
INTERNAL
BAND GAP
VREF
SINGLE-CYCLE 8061-BASED MCU
RESET
DVDD
62 kBYTES FLASH/EE PROGRAM MEMORY
4 kBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
POR
On-chip peripherals
Internal power-on reset circuit
12-bit voltage output DAC
DGND
PLL AND PRG
CLOCK DIV
3 × 16 BIT TIMERS
BAUD RATE TIMER
POWER SUPPLY MON
WATCHDOG TIMER
WAKE-UP/
RTC TIMER
UART, SPI, AND I 2
SERIAL I/O
C
4 × PARALLEL
PORTS
OSC
Dual 16-bit Σ-Δ DACs
On-chip temperature sensor (ADuC845 only)
Dual excitation current sources (200 µA)
Time interval counter (wake-up/RTC timer)
UART, SPI®, and I2C® serial I/O
XTAL1 XTAL2
Figure 1. ADuC845 Functional Block Diagram
High speed dedicated baud rate generator (incl. 115,200)
Watchdog timer (WDT)
Power supply monitor (PSM)
Rev. C
Document Feedback
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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2004–2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com