Datasheet

ADuC845/ADuC847/ADuC848 Data Sheet
Rev. C | Page 6 of 108
Parameter Min Typ Max Unit Conditions
AUXILIARY ADC ANALOG INPUTS
(ADuC845 Only)
Differential Input Voltage Ranges
5, 6
Bipolar Mode (ADC1CON.5 = 0) ±V
REF
V REFIN = REFIN(+) − REFIN(−) (or Int 1.25 V
REF
)
Unipolar Mode (ADC1CON.5 = 1) 0 – V
REF
V REFIN = REFIN(+) − REFIN(−) (or Int 1.25 V
REF
)
Average Analog Input Current 125 nA/V
Analog Input Current Drift ±2 pA/V/°C
Absolute AIN/AINCOM Voltage
Limits
2, 7
A
GND
−
0.03
AV
DD
+
0.03
V
Normal Mode Rejection 50 Hz/60 Hz
2
On AIN and REFIN
75
dB
50 Hz/60 Hz ± 1 Hz, 16.6 Hz Fadc, SF = 52H,
chop on, REJ60 on
100 dB 50 Hz ± 1 Hz, 16.6 Hz Fadc, SF = 52H, chop on
67 dB
50 Hz/60 Hz ± 1 Hz, 50 Hz Fadc, SF = 52H,
chop off, REJ60 on
100 dB 50 Hz ± 1 Hz, 50 Hz Fadc, SF = 52H, chop off
ADC SYSTEM CALIBRATION
Full-Scale Calibration Limit +1.05 × FS V
Zero-Scale Calibration Limit
−1.05 × FS
V
Input Span 0.8 × FS 2.1 × FS V
DAC
Voltage Range
0 – V
REF
V
DACCON.2 = 0
0 – AV
DD
V DACCON.2 = 1
Resistive Load 10 kΩ From DAC output to AGND
Capactive Load 100 pF From DAC output to AGND
Output Impedance 0.5 Ω
I
SINK
50 µA
DC Specifications
8
Resolution 12 Bits
Relative Accuracy ±3 LSB
Differential Nonlinearity −1 LSB Guaranteed 12-bit monotonic
Offset Error ±50 mV
Gain Error
±1
%
AV
DD
range
±1 % V
REF
range
AC Specifications
2, 8
Voltage Output Settling Time 15 µs Settling time to 1 LSB of final value
Digital-to-Analog Glitch Energy 10 nVs 1 LSB change at major carry
INTERNAL REFERENCE
ADC Reference Chop enabled
Reference Voltage
1.25 − 1%
1.25 1.25 + 1% V Initial tolerance @ 25°C, V
DD
= 5 V
Power Supply Rejection 45 dB
Reference Tempco 100 ppm/°C
DAC Reference
Reference Voltage 2.5 – 1% 2.5 2.5 + 1% ±1% V Initial tolerance @ 25°C, V
DD
= 5 V
Power Supply Rejection 50 dB
Reference Tempco ±100 ppm/°C
TEMPERATURE SENSOR
(ADuC845 Only)
Accuracy ±2 °C
Thermal Impedance
90
°C/W
MQFP
52 °C/W LFCSP
Footnotes at end of table.