Datasheet

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TYPICAL CHARACTERISTICS
22
21
20
19
18
17
16
15
14
13
12
Decimation Ratio =
f
MOD
f
DATA
0 500 1000 1500 2000
PGA4
ENOB (rms)
PGA1
PGA2
PGA16
PGA8
PGA32 PGA64 PGA128
Sinc
3
Filter
22
21
20
19
18
17
16
15
14
13
12
0 500 1000 1500 2000
ENOB (rms)
PGA4
PGA8
PGA1
PGA2
PGA16
PGA32 PGA64 PGA128
Decimation Ratio =
f
MOD
f
DATA
Sinc
3
Filter, Buffer ON
22
21
20
19
18
17
16
15
14
13
12
Decimation Ratio =
f
MOD
f
DATA
0 500 1000 1500 2000
PGA4
ENOB (rms)
PGA1
PGA2
PGA16
PGA8
PGA32
PGA64
PGA128
Sinc
3
Filter, V
REF
= 1.25V, Buffer OFF
22
21
20
19
18
17
16
15
14
13
12
0 500 1000 1500 2000
ENOB (rms)
PGA4
PGA8
PGA1
PGA2
PGA16
PGA32 PGA64
PGA128
Decimation Ratio =
f
MOD
f
DATA
Sinc
3
Filter, V
REF
= 1.25V, Buffer ON
ADS1218
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
AV
DD
= +5V, DV
DD
= +5V, f
OSC
= 2.4576MHz, PGA = 1, R
DAC
= 150k Ω , V
REF
≡ (REF IN+) – (REF IN–) = +2.5V, and
f
DATA
= 10Hz, unless otherwise specified.
EFFECTIVE NUMBER OF BITS EFFECTIVE NUMBER OF BITS
vs DECIMATION RATIO vs DECIMATION RATIO
Figure 1. Figure 2.
EFFECTIVE NUMBER OF BITS EFFECTIVE NUMBER OF BITS
vs DECIMATION RATIO vs DECIMATION RATIO
Figure 3. Figure 4.
11