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Analog Devices Semiconductor Electronic Components Datasheet

ADUC844 Datasheet

MicroConverter/ Dual 16-Bit/24-Bit ADCs with Embedded 62kB FLASH MCU

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PRELIMINARY TECHNICAL DATA
a
MicroConverter, Dual 16-Bit/24-Bit ADCs
with Embedded 62kB FLASH MCU
Preliminary Technical Data
ADuC844
FEATURES
High Resolution Sigma-Delta ADCs
Two Independent ADCs (24-Bit and 16-Bit Resolution)
24-Bit No Missing Codes, Primary ADC
21-Bit rms (18.5 Bit p-p) Effective Resolution @ 20 Hz
Offset Drift 10 nV/°C, Gain Drift 0.5 ppm/°C
Memory
62 Kbytes On-Chip Flash/EE Program Memory
4 Kbytes On-Chip Flash/EE Data Memory
Flash/EE, 100 Year Retention, 100 Kcycles Endurance
3 Levels of Flash/EE Program Memory Security
In-Circuit Serial Download (No External Hardware)
High Speed User Download (5 Seconds)
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
26 Programmable I/O 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 S-D DACs/PWMs
On-Chip Temperature Sensor
Dual Excitation Current Sources
Time Interval Counter (Wakeup/RTC Timer)
UART, SPI®, and I2C® Serial I/O
High Speed Baud Rate Generator (incl 115,200)
Watchdog Timer (WDT)
Power Supply Monitor (PSM)
Power
Normal: 2.3mA Max @ 3.6 V (Core CLK = 1.57 MHz)
Power-Down: 20µA Max with Wakeup 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 CSP (8 mm × 8 mm), –40°C to +85°C
APPLICATIONS
Intelligent Sensors
WeighScales
Portable Instrumentation, Battery Powered Systems
4-20mA Transmitters
Data Logging
Precision System Monitoring
REV. PrB
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.
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 companies.
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The ADuC844 is a complete smart transducer front end, integrating
two high resolution sigma-delta ADCs, an 8-bit MCU, and
program/data Flash/EE memory on a single chip.
The two independent ADCs (primary and auxiliary) include a
temperature sensor and a PGA (allowing direct measurement of low
level signals). The ADCs with on-chip digital filtering and
programmable output data rates are intended for the measurement of
wide dynamic range, low frequency signals, such as those in weigh
scale, strain-gage, pressure transducer, or temperature measurement
applications.
The device operates from a 32 kHz crystal with an on-chip PLL
generating a high frequency clock of 12.58 MHz. This clock is routed
through a programmable clock divider from which the MCU core
clock operating frequency is generated. The microcontroller core is an
optimized single cycle 8052 offering up to 12.58MIPs performance
while maintaining the 8051 instruction set compatibility.
62 Kbytes of nonvolatile Flash/EE program memory, 4 Kbytes of
nonvolatile Flash/EE data memory, and 2304 bytes of data RAM are
provided on-chip. The program memory can be configured as data
memory to give up to 60 Kbytes of NV data memory in data logging
applications.
On-chip factory firmware supports in-circuit serial download and
debug modes (via UART), as well as single-pin emulation mode via
the EA pin. The ADuC844 is supported by a QuickStart™
development system featuring low cost software and hardware
development tools.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADUC844 Datasheet

MicroConverter/ Dual 16-Bit/24-Bit ADCs with Embedded 62kB FLASH MCU

No Preview Available !

PRELIMINARY TECHNICAL DATA
ADuC844 SPECIFICATIONS1 (AVDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, DVDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V,
REFIN(+) = 2.5 V, REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz
Crystal; all specifications TMIN, to TMAX unless otherwise noted.).
PARAMETER
PRIMARY ADC
Conversion Rate
No Missing Codes2
Resolution
Output Noise
Integral Non Linearity
Offset Error3
Offset Error Drift (vs. Temp)
Full-Scale Error4
Gain Error Drift5 (vs. Temp)
ADC Range Matching
Power Supply Rejection
Common Mode DC Rejection
On AIN
On AIN
Common Mode 50/60Hz Rejection
On AIN
On AIN
Normal Mode 50/60 Hz Rejection
On AIN
MIN TYP MAX
UNITS CONDITION
5.35 19.79 105
24
13.5
18.5
See Tables X and XI in ADC
Description
± 15
±3
± 10
± 10
± 0.5
±2
80
113
Hz
Bits
Bits Pk-Pk
Bits Pk-Pk
ppm of FSR
µV
nV/°C
µV
ppm/°C
µV
dBs
dBs
On Both Channels
19.79Hz Update Rate
Range = ± 20mV, 20Hz Update Rate
Range = ± 2.56V, 20Hz Update Rate
Output Noise varies with selected Update Rates
and Gain Range
1 LSB16
AIN=18mV
AIN=1V, Range=± 2.56V
AIN=7.8mV, Range=± 20mV
95
113
95
90
dBs @DC, AIN=7.8mV, Range=± 20mV
dBs @DC, AIN=1V, Range=± 2.56V
20 Hz Update Rate
dBs 50/60Hz ± 1Hz, AIN=7.8mV, Range=± 20mV
dBs 50/60Hz ± 1Hz, AIN=1V, Range=± 2.56V
60 dBs 50/60Hz ± 1Hz, 20 Hz Update Rate
PRIMARY ADC ANALOG INPUTS
Differential Input Voltage Ranges9,10
Bipolar Mode (ADC0CON.5 = 0)
Unipolar Mode (ADC0CON.5 = 1)
Analog Input Current2
Analog Input Current Drift
Absolute AIN Voltage Limits2
EXTERNAL REFERENCE INPUTS
REFIN(+) to REFIN(–) Range2
Average Reference Input Current
Average Reference Input Current Drift
‘NO Ext. REF’ Trigger Voltage
Common Mode DC Rejection
Common Mode 50/60Hz Rejection
Normal Mode 50/60 Hz Rejection
± 1.024 x VREF/GAIN
0 à 1.024 x REFIN/GAIN
±1
±5
±5
± 15
AGND + 0.1
AVDD – 0.1
1 2.5 AVDD
+/- 1
+/- 0.01
0.3 0.65
125
90
60
V
V
nA
nA
pA/°C
pA/°C
V
VREF = REFIN(+) - REFIN(-) (or Int 1.25V Ref)
GAIN = 1 to 128
VREF = REFIN(+) - REFIN(-)
GAIN=1 to 128
TMAX = 85°C
TMAX = 125°C
TMAX = 85°C
TMAX = 125°C
V
µA/V
nA/V/°C
V
dBs
dBs
dBs
Both ADCs Enabled
NOXREF bit active if VREF<0.3V
NOXREF bit Inactive if VREF>0.65
@DC, AIN=1V, Range=± 2.56V
50/60Hz ± 1Hz, AIN=1V, Range=± 2.56V
50/60Hz ± 1Hz, 59.4 Hz Update Rate
-2- REV. PrB


Part Number ADUC844
Description MicroConverter/ Dual 16-Bit/24-Bit ADCs with Embedded 62kB FLASH MCU
Maker Analog Devices
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ADUC844 Datasheet PDF






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