ADUC845_15 Datasheet, PDF (1/108 Pages) Analog Devices – 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 I²C® serial I/O
High speed dedicated baud rate generator (incl. 115,200)
Watchdog timer (WDT)
Power supply monitor (PSM)
MicroConverter^® Multichannel
24-/16-Bit ADCs with Embedded 62 kB
Flash and Single-Cycle MCU
ADuC845/ADuC847/ADuC848
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
AIN1
AIN10
AINCOM
REFIN2+
REFIN2–
REFIN–
REFIN+
RESET
DV_DD
DGND
FUNCTIONAL BLOCK DIAGRAM
AVCO
ADuC845
AV_DD
CURRENT
SOURCE
MUX
BUF
PGA
PRIMARY
24-BIT S-D ADC
12-BIT
DAC
AGND
TEMP
SENSOR
AUXILIARY
24-BIT S-D ADC
DUAL 16-BIT
S-D DAC
DUAL 16-BIT
PWM
BUF
MUX
IEXC1
IEXC2
DAC
PWM0
PWM1
EXTERNAL
V_REF
DETECT
INTERNAL
BAND GAP
V_REF
SINGLE-CYCLE 8061-BASED MCU
POR
OSC
PLL AND PRG
CLOCK DIV
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
POWER SUPPLY MON
WATCHDOG TIMER
4 × PARALLEL
PORTS
UART, SPI, AND I ²C
SERIAL I/O
XTAL1 XTAL2
Figure 1. ADuC845 Functional Block Diagram
Rev. C
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