Datasheet

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SBAS317E − APRIL 2004 − REVISED MAY 2006
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16
TYPICAL CHARACTERISTICS: ALL DEVICES (Continued)
AV
DD
= +5V, DV
DD
= +5V, f
OSC
= 8MHz, PGA = 1, f
MOD
= 15.625kHz, ADC Bipolar Mode, Buffer ON, and V
REF
≡ (REF IN+) − (REF IN−) = +2.5V, unless
otherwise specified.
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
ANALOG SUPPLY CURRENT
vs ANALOG SUPPLY VOLTAGE
Analog Supply Voltage (V)
2.5 3.5 4.5 5.53.0 4.0 5.0
Analog Supply Current (mA)
−
55
_
C
−
40
_
C
+25
_
C
+85
_
C
+125
_
C
PGA = 128
DV
DD
=AV
DD
V
REF
= 1.25V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
ADC POWER−SUPPLY CURRENT
vs PGA
PGA Setting
1824 3216 12864
I
ADC
(
µ
A)
AV
DD
= 5V, Buffer = ON
AV
DD
= 5V, Buffer = OFF
AV
DD
= 3V, Buffer = ON
AV
DD
= 3V, Buffer = OFF
14
12
10
8
6
4
2
0
−
2
−
4
−
6
−
8
−
10
−
12
−
14
−
16
ADC OFFSET DAC:
OFFSET vs TEMPERATURE
Offset (ppm of FSR)
Temperature (
_
C)
−
60
−
40
−
20 0 +20 +40 +60 +80 +100 +120 +140
1.00008
1.00006
1.00004
1.00002
1
0.99998
0.99996
0.99994
0.99992
ADC OFFSET DAC:
GAIN vs TEMPERATURE
Normalized Gain
Temperature (
_
C)
−
60
−
40
−
20 +140+20 +40 +60 +80 +100 +1200
DIGITAL SUPPLY CURRENT
vs EXTERNAL CLOCK FREQUENCY
Clock Frequency (MHz)
Digital Supply Current (mA)
1 10 100
100
10
1
0.1
DV
DD
=5V
Normal Mode
DV
DD
=3V
Normal Mode
DV
DD
=3V
Idle Mode
DV
DD
=5V
Idle Mode
DIGITAL SUPPLY CURRENT vs CLOCK DIVIDER
Clock Frequency (MHz)
Digital Supply Current (mA)
110100
100
10
1
0.1
1024
Divider Values
2
1
4
8
16
32