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1.00010
1.00006
1.00002
0.99998
0.99994
0.99990
0.99986
Temperature (

C)
−
50
−
30 10
−
10 30 50 70 90
Gain (Normalized)
10
8
6
4
2
0
−
2
−
4
−
6
−
8
−
10
V
IN
(V)
−
2.5
−
2
−
1
−
0.5
−
1.5 0 0.5 1 1.5 2 2.5
INL (ppm of FS)
−40

C
+25

C
+85

C
250
200
150
100
50
0
Current (
µ
A)
I
ANALOG
I
ANALOG
I
DIGITAL
I
DIGITAL
Temperature (

C)
−
50
−
30 10
−
10 30 50 70 90
900
800
700
600
500
400
300
200
100
0
PGA Setting
0 1 82 4 3216 12864
I
ADC
(
µ
A)
AV
DD
= 5V, Buffer = ON
AV
DD
= 3V, Buffer = ON
Buffer = OFF
Buffer = OFF
400
350
300
250
200
150
100
50
0
V
DD
(V)
3.0 4.0 5.0
Current (
µ
A)
Normal
f
OSC
= 4.91MHz
SLEEP
f
OSC
= 4.91MHz
SPEED = 0
SLEEP
f
OSC
= 2.45MHz
Power
Down
Normal
f
OSC
= 2.45MHz
4500
4000
3500
3000
2500
2000
1500
1000
500
0
ppm of FS
−
2
Number of Occurrences
−
1.5
−
1
−
0.5 0 0.5 1 1.5 2
ADS1218
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
TYPICAL CHARACTERISTICS (continued)
AV
DD
= +5V, DV
DD
= +5V, f
OSC
= 2.4576MHz, PGA = 1, R
DAC
= 150k Ω , V
REF
≡ (REF IN+) – (REF IN–) = +2.5V, and
f
DATA
= 10Hz, unless otherwise specified.
GAIN vs TEMPERATURE INTEGRAL NONLINEARITY vs INPUT SIGNAL
Figure 11. Figure 12.
CURRENT vs TEMPERATURE ADC CURRENT vs PGA
Figure 13. Figure 14.
DIGITAL CURRENT HISTOGRAM OF OUTPUT DATA
Figure 15. Figure 16.
13