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ADS1240, 1241
7
SBAS173F
www.ti.com
TYPICAL CHARACTERISTICS
All specifications AVDD = +5V, DVDD = +5V, fOSC = 2.4576MHz, PGA = 1, fDATA = 15Hz, and VREF ≡ (REF IN+) – (REF IN–) = +2.5V, unless otherwise specified.
22
21
20
19
18
17
16
15
EFFECTIVE NUMBER OF BITS vs PGA SETTING
PGA Setting
ENOB
(rms)
1
2
4
8
16
128
64
32
DR = 10
DR = 00
DR = 01
Buffer ON
21.5
21.0
20.5
20.0
19.5
19.0
18.5
18.0
17.5
17.0
EFFECTIVE NUMBER OF BITS vs PGA SETTING
PGA Setting
1
2
4
8
16
128
64
32
ENOB
(rms)
Buffer OFF
DR = 10
DR = 01
DR = 00
20.5
20.0
19.5
19.0
18.5
18.0
17.5
17.0
16.5
16.0
EFFECTIVE NUMBER OF BITS vs PGA SETTING
PGA Setting
1
2
4
8
16
64
128
32
ENOB
(rms)
Buffer OFF, V
REF = 1.25V
DR = 10
DR = 00
DR = 01
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
NOISE vs INPUT SIGNAL
V
IN (V)
–2.5
–1.5
0.5
–0.5
1.5
2.5
Noise
(rms,
ppm
of
FS)
140
120
100
80
60
40
20
0
COMMON-MODE REJECTION RATIO
vs FREQUENCY
Frequency of Power Supply (Hz)
1
10
100
1k
10k
100k
CMRR
(dB)
Buffer ON
POWER SUPPLY REJECTION RATIO
vs FREQUENCY
Frequency of Power Supply (Hz)
110
1k
100
10k
100k
PSRR
(dB)
140
120
100
80
60
40
20
0
Buffer ON