Datasheet

Data Sheet ADuCM360/ADuCM361
Rev. B | Page 7 of 24
Parameter Test Conditions/Comments Min Typ Max Unit
Average Input Current Drift
1
Buffered Mode AIN0, AIN1, AIN2, AIN3 ±5 pA/°C
AIN4, AIN5, AIN6, AIN7 ±16 pA/°C
AIN8, AIN9, AIN10, AIN11 ±9 pA/°C
Unbuffered Mode
±250
pA/V/°C
Common-Mode Rejection, DC
1
On ADC input
ADC gain = 1, AVDD < 2 V 65 100 dB
ADC gain = 1, AVDD > 2 V 80 100 dB
ADC gain = 2 to 128 80 dB
Common-Mode Rejection,
50 Hz/60 Hz
1
50 Hz/60 Hz ± 1 Hz; f
ADC
= 16.7 Hz,
chop on; f
ADC
= 50 Hz, chop off
ADC gain = 1 97 dB
ADC gain = 2 to 128 90 dB
Normal-Mode Rejection, 50 Hz/60 Hz
1
On ADC input
50 Hz/60 Hz ± 1 Hz; f
ADC
= 16.7 Hz,
chop on; f
ADC
= 50 Hz, chop off
60 80 dB
TEMPERATURE SENSOR
1
After user calibration
Voltage Output at 25°C
Processor powered down or in standby
mode before measurement
82.1 mV
Voltage Temperature Coefficient (TC) 250 µV/°C
Accuracy 6 °C
GROUND SWITCH
R
ON
3.7 10 19 Ω
Allowable Current
1
20 kΩ resistor off, direct short to ground 20 mA
VOLTAGE REFERENCE
ADC internal reference
Internal V
REF
1.2 V
Initial Accuracy Measured at T
A
= 25°C −0.1 +0.1 %
Reference Temperature Coefficient
(TC)
1, 10
−15 ±5 +15 ppm/°C
Power Supply Rejection
1
82 90 dB
EXTERNAL REFERENCE INPUTS
Input Range
Buffered Mode AGND + 0.1 AVDD − 0.1 V
Unbuffered Mode
Minimum differential voltage between
VREF+ and VREF− pins is 400 mV
0 AVDD V
Input Current
Buffered Mode −20 +10 +27 nA
Unbuffered Mode 500 nA/V
Normal-Mode Rejection
1
80
dB
Common-Mode Rejection
1
85 100 dB
Reference Detect Levels
1
400 mV
EXCITATION CURRENT SOURCES
Output Current
Available from each current source; value
programmable from 10 µA to 1 mA
10 50 1000 μA
Initial Tolerance at 25°C
1
I
OUT
≥ 50 µA ±5 %
Drift
1
Using internal reference resistor 100 400 ppm/°C
Using external 150 kΩ reference resistor
between IREF pin and AGND; resistor
must have drift specification of 5 ppm/°C
75
400
ppm/°C
Initial Current Matching at 25°C
1
Matching between both current sources ±0.5 %
Drift Matching
1
50 ppm/°C
Load Regulation, AVDD
1
AVDD = 3.3 V 0.2 %/V
Output Compliance
1
I
OUT
= 10 µA to 210 µA
AGND − 0.03
AVDD − 0.85
V
I
OUT
> 210 µA AGND − 0.03 AVDD − 1.1 V