Datasheet

Data Sheet ADuC845/ADuC847/ADuC848
Rev. C | Page 7 of 108
Parameter Min Typ Max Unit Conditions
TRANSDUCER BURNOUT CURRENT
SOURCES
AIN+ Current −100 nA
AIN+ is the selected positive input (AIN4 or AIN6
only) to the primary ADC
AIN− Current 100 nA
AIN− is the selected negative input (AIN5 or AIN7
only) to the primary ADC
Initial Tolerance at 25°C ±10 %
Drift 0.03 %/°C
EXCITATION CURRENT SOURCES
Output Current 200 µA Available from each current source
Initial Tolerance at 25°C ±10 %
Drift 200 ppm/°C
Initial Current Matching at 25°C ±1 % Matching between both current sources
Drift Matching
20
ppm/°C
Line Regulation (AV
DD
)
1
µA/V
AV
DD
= 5 V ± 5%
Load Regulation 0.1
µ
A/V
Output Compliance
2
AGND
AV
DD
− 0.6
V
POWER SUPPLY MONITOR (PSM)
AV
DD
Trip Point Selection Range 2.63 4.63 V Four trip points selectable in this range
AV
DD
Trip Point Accuracy ±3.0 % T
MAX
= 85°C
±4.0 % T
MAX
= 125°C
DV
DD
Trip Point Selection Range 2.63 4.63 V Four trip points selectable in this range
DV
DD
Trip Point Accuracy ±3.0 % T
MAX
= 85°C
±4.0 % T
MAX
= 125°C
CRYSTAL OSCILLATOR
(XTAL1 AND XTAL2)
Logic Inputs, XTAL1 Only
2
V
INL
, Input Low Voltage
0.8
V
DV
DD
= 5 V
0.4 V DV
DD
= 3 V
V
INH
, Input Low Voltage 3.5 V DV
DD
= 5 V
2.5 V DV
DD
= 3 V
XTAL1 Input Capacitance 18 pF
XTAL2 Output Capacitance 18 pF
LOGIC INPUTS
All inputs except SCLOCK, RESET,
and XTAL1
2
V
INL
, Input Low Voltage 0.8 V DV
DD
= 5 V
0.4
V
DV
DD
= 3 V
V
INH
, Input Low Voltage 2.0 V
SCLOCK and RESET Only
(Schmidt Triggered Inputs)
2
V
T+
1.3 3.0 V DV
DD
= 5 V
0.95 2.5 V DV
DD
= 3 V
V
T−
0.8
1.4
V
DV
DD
= 5 V
0.4 1.1 V DV
DD
= 3 V
V
T+
− V
T−
0.3 0.85 V DV
DD
= 5 V or 3 V
Input Currents
Port 0, P1.0 to P1.7, EA
±10 µA V
IN
= 0 V or V
DD
RESET ±10 µA V
IN
= 0 V, DV
DD
= 5 V
35 105 µA V
IN
= DV
DD
, DV
DD
= 5 V, internal pull-down
Port 2, Port 3 ±10 µA V
IN
= DV
DD
, DV
DD
= 5 V
−180 −660 µA V
IN
= 2 V, DV
DD
= 5 V
−20 −75 µA V
IN
= 0.45 V, DV
DD
= 5 V
Input Capacitance 10 pF All digital inputs