9 measurement bridge and 10-bit adc – Rainbow Electronics AT73C246 User Manual
Page 20
20
11050A–PMAAC–07-Apr-10
AT73C246
9.9
Measurement Bridge and 10-bit ADC
Notes: 1. The 10-bit ADC is supplied from the regulated V
DDC
voltage (1.8V) which is generated from V
INSYS
.
2. Please refer to Atmel Data Converter Terminology literature
Table 9-10.
Measurement Bridge and 10-bit ADC Electrical Characteristics
Symbol
Parameter
Comments
Min
Typ
Max
Units
V
IN
Operating Supply Voltage
V
INSYS
2.9
3.6
5.5
V
I
DD
Supply Current
OFF
-
-
1
µA
ON
-
-
2
mA
V
REF
Reference Voltage
Internally connected to
VDDC pin.
1.75
1.8
1.85
V
INL
Integral Non Linearity
End Point Method
-2
-
+2
LSB
DNL
Differential Non Linearity
End Point Method
-1
-
+1
LSB
Offset
Offset Error
-2
+2
LSB
GAIN
Gain Error
-2
+2
LSB
F
S
Sampling Rate
300
kS/s
T
ACQ
Track and Hold Acquisition Time
500
ns
V
MEAS
Measured Input Voltage Range
External inputs ANA{0,1,2,3}
0.4
V
INSYS
V
V
DD{0,1,2,3,4}
inputs
0.4
4
V
V
INSYS
input
0.4
5.5
V
ATT
MEAS
Measured Input Scaling Factor
External inputs ANA{0,1,2,3}
-1%
0.25
+1%
V/V
V
DD{0,1,2,3,4,5}
inputs
-1%
0.4
+1%
V/V
V
INSYS
input
-1%
0.25
+1%
V/V
R
IN_NOM
ANA{0,1,2,3} Input resistance
T
j
= 25C
96
120
144
k
Ω
R
IN_TEMP
R
IN
deviation with temperature
T
J
[-40 ; +25]. Relative to
R
IN_NOM
+ 20
%
T
J
[25 ; 125]. Relative to
R
IN_NOM
-16
C
IN
ANA{0,1,2,3} Input capacitance
15
pF