Datasheet

 
 
SBAS323GJUNE 2004 − REVISED OCTOBER 2007
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18
TYPICAL CHARACTERISTICS (Continued)
AV
DD
= +5V, DV
DD
= +5V, f
OSC
= 8MHz, PGA = 1, f
MOD
= 15.625kHz, Bipolar, filter = Sinc
3
, Buffer ON, and V
REF
(REF IN+) − (REF IN−) = +2.5V, unless otherwise
specified.
15
10
5
0
5
10
15
ADC INTEGRAL NONLINEARITY
vs INPUT SIGNAL
V
IN
(V)
2.5
2
1
0.5
1.5 0 0.5 1 1.5 2 2.5
ADC INL (ppm of FS)
40
_
C
+25
_
C
+125
_
C
+85
_
C
AV
DD
=5V
V
REF
=2.5V
Buffer ON
15
10
5
0
5
10
15
ADC INTEGRAL NONLINEARITY
vs INPUT SIGNAL
V
IN
(V)
2.5
1.0
0.5 1.00.5 2.0 2.5
1.5
2.0 0 1.5
ADC INL (ppm of FS)
AV
DD
=5V
V
REF
=2.5V
Buffer OFF
+125
_
C
+85
_
C
+25
_
C
55
_
C
40
_
C
30
20
10
0
10
20
30
ADC INTEGRAL NONLINEARITY
vs INPUT SIGNAL
V
IN
(V)
V
IN
=
V
REF
0V
IN
=+V
REF
V
REF
=AV
DD
Buffer OFF
ADC INL (ppm of FS)
35
30
25
20
15
10
5
0
ADC INTEGRAL NONLINEARITY
vs V
REF
V
REF
(V)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
ADC INL (ppm of FS)
Buffer OFF
AV
DD
=3V
AV
DD
=5V
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
ANALOG SUPPLY CURRENT
vs ANALOG SUPPLY VOLTAGE
Analog Supply Voltage (V)
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Analog Supply Current (mA)
PGA = 128, ADC ON,
Brownout Detect ON,
All VDACs ON = FFFFh,
VDACs REF = AV
DD
40
_
C
+25
_
C
+85
_
C
+125
_
C
900
800
700
600
500
400
300
200
100
0
ADC CURRENT vs PGA
PGA Setting
01 824 3216 12864
AV
DD
= 5V, Buffer = ON
AV
DD
= 3V, Buffer = ON
Buffer = OFF
Buffer = OFF
I
ADC
(µA)