TYPICAL CHARACTERISTICS (Cont.)
AVDD = +5V, DVDD = +5V, fOSC = 2.4576MHz, PGA = 1, RDAC = 150kΩ, fDATA = 10Hz, VREF ≡ (REF IN+) – (REF IN–) = +2.5V, unless otherwise specified.
CURRENT vs TEMPERATURE
ADC CURRENT vs PGA
250
200
150
100
50
900
800
700
600
500
400
300
200
100
0
AVDD = 5V, Buffer = ON
Buffer = OFF
IDIGITAL
IANALOG
IANALOG
AVDD = 3V, Buffer = ON
Buffer = OFF
IDIGITAL
0
–50
–30
–10
10
30
50
70
90
0
1
2
4
8
16
32
64
128
Temperature (°C)
PGA Setting
DIGITAL CURRENT
HISTOGRAM OF OUTPUT DATA
4500
4000
3500
3000
2500
2000
1500
1000
500
400
350
300
250
200
150
100
50
Normal
fOSC = 4.91MHz
SPEED = 0
Normal
SLEEP
fOSC = 4.91MHz
fOSC = 2.45MHz
Power
Down
SLEEP
fOSC = 2.45MHz
0
0
–2
–1.5
–1
–0.5
0
0.5
1
1.5
2
3.0
4.0
5.0
ppm of FS
VDD (V)
OFFSET DAC - OFFSET vs TEMPERATURE
VREFOUT vs LOAD CURRENT
200
170
140
110
80
2.55
2.50
2.45
50
20
–10
–40
–70
–100
–50
–30
–10
10
30
50
70
90
–0.5
0
0.5
1.0
1.5
2.0
2.5
Temperature (°C)
VREFOUT Current Load (mA)
ADS1218
10
SBAS187
BB [ BURR-BROWN CORPORATION ]
