ADS1218_14 Datasheet, PDF (11/45 Pages) Texas Instruments – 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory

ADS1218
www.ti.com
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
TYPICAL CHARACTERISTICS
AV_DD = +5V, DV_DD = +5V, f_OSC = 2.4576MHz, PGA = 1, R_DAC = 150kΩ, V_REF ≡ (REF IN+) – (REF IN–) = +2.5V, and
f_DATA = 10Hz, unless otherwise specified.
22
21
20
19
18
17
16
15
14
13
12
0
EFFECTIVE NUMBER OF BITS
vs DECIMATION RATIO
PGA1 PGA2 PGA4 PGA8
PGA16 PGA32
PGA64
PGA128
Sinc³ Filter
500
1000
1500
Decimation Ratio = ^fMOD
f_DATA
Figure 1.
2000
EFFECTIVE NUMBER OF BITS
vs DECIMATION RATIO
22
PGA1 PGA2
21
PGA4
PGA8
20
19
18
17
16
15
14
13
12
0
PGA16 PGA32
PGA64
PGA128
Sinc³ Filter, Buffer ON
500
1000
1500
Decimation Ratio = ^fMOD
f_DATA
2000
Figure 2.
22
21
20
19
18
17
16
15
14
13
12
0
EFFECTIVE NUMBER OF BITS
vs DECIMATION RATIO
PGA1 PGA2 PGA4 PGA8
PGA16 PGA32
PGA64
PGA128
Sinc³ Filter, V_REF = 1.25V, Buffer OFF
500
1000
1500
Decimation Ratio = ^fMOD
f_DATA
Figure 3.
2000
EFFECTIVE NUMBER OF BITS
vs DECIMATION RATIO
22
PGA1 PGA2
21
PGA4
PGA8
20
19
18
17
16
15
14
13
12
0
PGA32
PGA64
PGA128
PGA16
Sinc³ Filter, V_REF = 1.25V, Buffer ON
500
1000
1500
Decimation Ratio = ^fMOD
f_DATA
2000
Figure 4.
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