MicroConverter
®
Multichannel
24-/16-Bit ADCs with Embedded 62 kB
Flash and Single-Cycle MCU
Data Sheet
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
Up to 10 ADC input channels on all parts
24-bit no missing codes
22-bit rms (19.5 bit p-p) effective resolution
Offset drift 10 nV/°C, gain drift 0.5 ppm/°C chop enabled
Memory
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)
2304 bytes on-chip data RAM
8051-based core
8051-compatible instruction set
High performance single-cycle core
32 kHz external crystal
On-chip programmable PLL (12.58 MHz max)
3 × 16-bit timer/counter
24 programmable I/O lines, plus 8 analog or
digital input lines
11 interrupt sources, two priority levels
Dual data pointer, extended 11-bit stack pointer
On-chip peripherals
Internal power-on reset circuit
12-bit voltage output DAC
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 I
2
C® serial I/O
High speed dedicated baud rate generator (incl. 115,200)
Watchdog timer (WDT)
Power supply monitor (PSM)
Power
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:
52-lead MQFP (14 mm × 14 mm), −40°C to +125°C
56-lead LFCSP (8 mm × 8 mm), −40°C to +85°C
APPLICATIONS
Multichannel sensor monitoring
Industrial/environmental instrumentation
Weigh scales, pressure sensors, temperature monitoring
Portable instrumentation, battery-powered systems
Data logging, precision system monitoring
FUNCTIONAL BLOCK DIAGRAM
AV
DD
ADuC845
AVCO
CURRENT
SOURCE
PRIMARY
24-BIT
S-D
ADC
IEXC1
IEXC2
AIN1
BUF
PGA
12-BIT
DAC
BUF
DAC
MUX
AIN10
AINCOM
AGND
AUXILIARY
24-BIT
S-D
ADC
TEMP
SENSOR
DUAL 16-BIT
S-D
DAC
MUX
DUAL 16-BIT
PWM
PWM0
PWM1
REFIN2+
REFIN2–
REFIN–
REFIN+
EXTERNAL
V
REF
DETECT
INTERNAL
BAND GAP
V
REF
SINGLE-CYCLE 8061-BASED MCU
RESET
DV
DD
DGND
POR
PLL AND PRG
CLOCK DIV
OSC
WAKE-UP/
RTC TIMER
62 kBYTES FLASH/EE PROGRAM MEMORY
4 kBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
3
×
16 BIT TIMERS
BAUD RATE TIMER
4
×
PARALLEL
PORTS
POWER SUPPLY MON
WATCHDOG TIMER
UART, SPI, AND I
2
C
SERIAL I/O
04741-001
XTAL1
XTAL2
Figure 1. ADuC845 Functional Block Diagram
Rev. C
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.
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Tel: 781.329.4700 ©2004–2012 Analog Devices, Inc. All rights reserved.
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