TYPICAL CHARACTERISTICS
All specifications, VDD = +5V, fOSC = 2.4576MHz, PGA = 1, fDATA = 15Hz, and VREF ≡ (REF IN+) – (REF IN–) = +2.5V, unless otherwise specified.
EFFECTIVE NUMBER OF BITS vs PGA SETTING
EFFECTIVE NUMBER OF BITS vs PGA SETTING
DR = 10
22
21
20
19
18
17
16
15
21.5
21.0
20.5
20.0
19.5
19.0
18.5
18.0
17.5
17.0
DR = 10
DR = 01
DR = 01
DR = 00
DR = 00
Buffer ON
Buffer OFF
1
2
4
8
16
32
64
128
1
2
4
8
16
32
64
128
PGA Setting
PGA Setting
NOISE vs INPUT SIGNAL
EFFECTIVE NUMBER OF BITS vs PGA SETTING
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
20.5
20.0
19.5
19.0
18.5
18.0
17.5
17.0
16.5
16.0
DR = 10
DR = 01
DR = 00
Buffer OFF, VREF = 1.25V
–2.5
–1.5
–0.5
0.5
1.5
2.5
1
2
4
8
16
32
64
128
VIN (V)
PGA Setting
COMMON-MODE REJECTION RATIO
vs FREQUENCY
POWER SUPPLY REJECTION RATIO
vs FREQUENCY
140
120
100
80
140
120
100
80
60
60
40
40
20
20
Buffer ON
10
Buffer ON
10
0
0
1
100
1k
10k
100k
1
100
1k
10k
100k
Frequency of Power Supply (Hz)
Frequency of Power Supply (Hz)
ADS1242, 1243
7
SBAS235B
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