TYPICAL CHARACTERISTICS (Cont.)
All specifications, VDD = +5V, fOSC = 2.4576MHz, PGA = 1, fDATA = 15Hz, and VREF ≡ (REF IN+) – (REF IN–) = +2.5V, unless otherwise specified.
OFFSET DAC
OFFSET vs TEMPERATURE
(Cal at 25°C)
NOISE HISTOGRAM
200
170
140
110
80
3500
3000
2500
2000
1500
1000
500
10k Readings
IN = 0V
V
50
20
–10
–40
–70
–100
0
–50
–30
–10
10
30
50
70
90
–3.5 –3.0 –2.5 –2.0 –1.5 –1 –0.5
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
Temperature (°C)
ppm of FS
OFFSET DAC
GAIN vs TEMPERATURE
(Cal at 25°C)
OFFSET DAC
NOISE vs SETTING
1.00020
1.00016
1.00012
1.00008
1.00004
1.00000
0.99996
0.99992
0.99988
0.99984
0.99980
0.99976
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50
–30
–10
10
30
50
70
90
–128 –96
–64 –32
0
32
64
96
128
Temperature (°C)
Offset DAC Setting
ADS1242, 1243
9
SBAS235B
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