Datasheet

ADS1240, 1241
7
SBAS173F
www.ti.com
TYPICAL CHARACTERISTICS
All specifications AV
DD
= +5V, DV
DD
= +5V, f
OSC
= 2.4576MHz, PGA = 1, f
DATA
= 15Hz, and V
REF
≡ (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 1286432
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 1286432
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 12832
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 1k100 10k 100k
PSRR (dB)
140
120
100
80
60
40
20
0
Buffer ON