ADS1218_14 Datasheet, PDF (14/45 Pages) Texas Instruments – 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory

ADS1218
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
www.ti.com
TYPICAL CHARACTERISTICS (continued)
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.
V_REFOUT vs LOAD CURRENT
2.55
2.50
2.45
−0.5
0
0.5
1.0
1.5
2.0
2.5
V_REFOUT Current Load (mA)
Figure 17.
OFFSET DAC – OFFSET vs TEMPERATURE
200
170
140
110
80
50
20
−10
−40
−70
−100
−50 −30 −10 10
30
50
70
90
Temperature (_C)
Figure 18.
OFFSET DAC – GAIN vs TEMPERATURE
1.00020
1.00016
1.00012
1.00008
1.00004
1.00000
0.99996
0.99992
0.99988
0.99984
0.99980
0.99976
−50 −30 −10 10
30
50
70
90
Temperature (_C)
Figure 19.
1.000
1.000
0.999
IDAC R_OUT vs V_OUT
+85_C
+25_ C
0.999
−40_C
0.998
0
1
2
3
4
5
V_DD − V_OUT (V)
Figure 20.
IDAC NORMALIZED vs TEMPERATURE
1.01
1.005
1
0.995
0.99
0.985
−50 −30 −10 10
30
50
70
90
Temperature (_ C)
Figure 21.
IDAC MATCHING vs TEMPERATURE
3000
2000
1000
0
−1000
−2000
−3000
−4000
−5000
−6000
−50 −30 −10 10
30
50
70
90
Temperature (_C)
Figure 22.
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