Datasheet

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SBAS317E − APRIL 2004 − REVISED MAY 2006
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17
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.
11
10
9
8
7
6
5
4
3
DIGITAL SUPPLY CURRENT
vs DIGITAL SUPPLY VOLTAGE
Digital Supply Voltage (V)
2.5 3.5 4.5 5.53.0 4.0 5.0
Digital Supply Current (mA)
−
55
_
C
−
40
_
C
+25
_
C
+85
_
C
+125
_
C
PGA = 128
DV
DD
=AV
DD
V
REF
=1.25V
ADCNORMALIZEDGAIN
vs PGA
PGA Setting
Normalized Gain (%)
1421681286432
101
100
99
98
97
96
95
External Reference
Buffer ON
External Reference
Buffer OFF
40
35
30
25
20
15
10
5
0
VOLTAGE REFERENCE INPUT CURRENT
vs PGA SETTING
PGA Gain
112824 8163264
Input Current (
µ
A)
V
REF
=2.5V
f
MOD
=62.5kHz
V
REF
=1.25V
f
MOD
=62.5kHz
V
REF
=2.5V
f
MOD
= 15.6kHz
V
REF
= 1.25V
f
MOD
= 15.6kHz
101.0
100.8
100.6
100.4
100.2
100.0
99.8
99.6
99.4
99.2
99.0
VOLTAGE REFERENCE CHANGE
vs ANALOG SUPPLY VOLTAGE
Analog Supply Voltage (V)
2.5 2.75 3.0 3.25 3.5 3.75 4.0 4.25 4.5 4.75 5.0 5.25
V
REF
Change (%)
2.5V
1.25V
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
INTERNAL OSCILLATOR LOW−FREQUENCY MODE
vs TEMPERATURE
Temperature (
_
C)
−
60 0 20 8060 120 140
−
20
−
40 40 100
IO Frequency (MHz)
5.25V
2.7V
3.3V
4.75V
32
31
30
29
28
27
26
INTERNAL OSCILLATOR HIGH−FREQUENCY MODE
vs TEMPERATURE
Temperature (
_
C)
−
60 0 20 8060 120 140
−
20
−
40 40 100
IO Frequency (MHz)
5.25V
4.75V