ADS1218_14 Datasheet, PDF (13/45 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 (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.
1.00010
GAIN vs TEMPERATURE
1.00006
1.00002
0.99998
0.99994
0.99990
0.99986
−50 −30 −10 10
30
50
70
90
Temperature (_ C)
Figure 11.
INTEGRAL NONLINEARITY vs INPUT SIGNAL
10
8
− 40_ C
6
4
+85_ C
2
0
−2
−4
+25_ C
−6
−8
−10
−2.5 −2 −1.5 −1 −0.5 0 0.5 1 1.5 2 2.5
V_IN (V)
Figure 12.
CURRENT vs TEMPERATURE
250
200
I_ANALOG
I_DIGITAL
150
100
I_DIGITAL
I_ANALOG
50
0
−50 −30 −10 10
30
50
70
90
Temperature (_C)
Figure 13.
ADC CURRENT vs PGA
900
800
AV_DD = 5V, Buffer = ON
Buffer = OFF
700
600
500
AV_DD = 3V, Buffer = ON
400
Buffer = OFF
300
200
100
0
0
1
2
4
8 16 32 64 128
PGA Setting
Figure 14.
DIGITAL CURRENT
400
SPEED = 0
350
SLEEP
Normal
f_OSC = 4.91MHz
300
f_OSC = 4.91MHz
Normal
250 _{fOSC = 2.45MHz}
200
150
100
50
0
3.0
Power
Down
SLEEP
f_OSC = 2.45MHz
4.0
5.0
V_DD (V)
Figure 15.
4500
4000
3500
3000
2500
2000
1500
1000
HISTOGRAM OF OUTPUT DATA
500
0
−2 −1.5 −1 −0.5 0 0.5 1 1.5 2
ppm of FS
Figure 16.
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