Datasheet

REV. A–4–
ADuC834
Parameter ADuC834 Test Conditions/Comments Unit
INTERNAL REFERENCE
ADC Reference
Reference Voltage 1.25 ± 1% Initial Tolerance @ 25°C, V
DD
= 5 V V min/max
Power Supply Rejection 45 dBs typ
Reference Tempco 100 ppm/°C typ
DAC Reference
Reference Voltage 2.5 ± 1% Initial Tolerance @ 25°C, V
DD
= 5 V V min/max
Power Supply Rejection 50 dBs typ
Reference Tempco ± 100 ppm/°C typ
ANALOG INPUTS/REFERENCE INPUTS
Primary ADC
Differential Input Voltage Ranges
9, 10
External Reference Voltage = 2.5 V
RN2, RN1, RN0 of ADC0CON Set to
Bipolar Mode (ADC0CON3 = 0) ± 20 0 0 0 (Unipolar Mode 0 mV to 20 mV) mV
± 40 0 0 1 (Unipolar Mode 0 mV to 40 mV) mV
± 80 0 1 0 (Unipolar Mode 0 mV to 80 mV) mV
± 160 0 1 1 (Unipolar Mode 0 mV to 160 mV) mV
± 320 1 0 0 (Unipolar Mode 0 mV to 320 mV) mV
± 640 1 0 1 (Unipolar Mode 0 mV to 640 mV) mV
± 1.28 1 1 0 (Unipolar Mode 0 V to 1.28 V) V
± 2.56 1 1 1 (Unipolar Mode 0 V to 2.56 V) V
Analog Input Current
2
± 1T
MAX
= 85°CnA max
± 5T
MAX
= 125°CnA max
Analog Input Current Drift ± 5T
MAX
= 85°CpA/°C typ
± 15 T
MAX
= 125°CpA/°C typ
Absolute AIN Voltage Limits
2
AGND + 100 mV V min
AV
DD
– 100 mV V max
Auxiliary ADC
Input Voltage Range
9, 10
0 to V
REF
Unipolar Mode, for Bipolar Mode V
See Note 11
Average Analog Input Current 125 Input Current Will Vary with Input nA/V typ
Average Analog Input Current Drift
2
± 2 Voltage on the Unbuffered Auxiliary ADC pA/V/°C typ
Absolute AIN Voltage Limits
2, 11
AGND – 30 mV V min
AV
DD
+ 30 mV V max
External Reference Inputs
REFIN(+) to REFIN(–) Range
2
1V min
AV
DD
V max
Average Reference Input Current 1 Both ADCs Enabled A/V typ
Average Reference Input Current Drift ± 0.1 nA/V/°C typ
‘NO Ext. REF’ Trigger Voltage 0.3 NOXREF Bit Active if V
REF
< 0.3 V V min
0.65 NOXREF Bit Inactive if V
REF
> 0.65 V V max
ADC SYSTEM CALIBRATION
Full-Scale Calibration Limit +1.05 FS V max
Zero-Scale Calibration Limit –1.05 FS V min
Input Span 0.8 FS V min
2.1 FS V max
ANALOG (DAC) OUTPUT
Voltage Range 0 to V
REF
DACRN = 0 in DACCON SFR V typ
0 to AV
DD
DACRN = 1 in DACCON SFR V typ
Resistive Load 10 From DAC Output to AGND k typ
Capacitive Load 100 From DAC Output to AGND pF typ
Output Impedance 0.5 typ
I
SINK
50 A typ
TEMPERATURE SENSOR
Accuracy ± 2 °C typ
Thermal Impedance (
JA
)90 MQFP Package °C/W typ
52 CSP Package (Base Floating)
12
°C/W typ
SPECIFICATIONS
(continued)