TYPICAL CHARACTERISTICS
All specifications V
DD
= +5V, f
OSC
= 2.4576MHz, PGA = 1, f
DATA
= 15Hz, and V
REF
≡
(REF IN+) – (REF IN–) = +2.5V, unless otherwise specified.
EFFECTIVE NUMBER OF BITS vs PGA SETTING
21.5
21.0
20.5
ENOB (rms)
EFFECTIVE NUMBER OF BITS vs PGA SETTING
22
21
DR = 10
DR = 01
ENOB (rms)
DR = 10
20
19
DR = 01
18
DR = 00
17
Buffer ON
16
15
20.0
19.5
19.0
DR = 00
18.5
18.0
Buffer OFF
17.5
17.0
1
2
4
8
16
32
64
128
PGA Setting
1
2
4
8
16
32
64
128
PGA Setting
EFFECTIVE NUMBER OF BITS vs PGA SETTING
20.5
20.0
19.5
DR = 10
2.0
1.8
NOISE vs INPUT SIGNAL
Noise (rms, ppm of FS)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
ENOB (rms)
19.0
18.5
18.0
17.5
17.0
16.5
16.0
1
2
4
8
16
32
Buffer OFF, V
REF
= 1.25V
DR = 00
DR = 01
64
128
0
–2.5
–1.5
–0.5
V
IN
(V)
0.5
1.5
2.5
PGA Setting
COMMON-MODE REJECTION RATIO
vs FREQUENCY
140
120
100
POWER SUPPLY REJECTION RATIO
vs FREQUENCY
140
120
100
PSRR (dB)
CMRR (dB)
80
60
40
20
Buffer ON
0
1
10
100
1k
10k
100k
Frequency of Power Supply (Hz)
80
60
40
20
Buffer ON
0
1
10
100
1k
10k
100k
Frequency of Power Supply (Hz)
ADS1242, 1243
SBAS235H
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