ADS1274
ADS1278
www.ti.com
SBAS367–JUNE 2007
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, High-Speed mode, AVDD = +5V, DVDD = +1.8V, IOVDD = +3.3V, fCLK = 27MHz, VREFP = 2.5V, and
VREFN = 0V, unless otherwise noted.
CHANNEL GAIN MATCH HISTOGRAM
CHANNEL OFFSET MATCH HISTOGRAM
100
90
80
70
60
50
40
30
20
10
0
70
60
50
40
30
20
10
0
High-Speed Mode
High-Speed Mode
10 Units
10 Units
Channel Gain Match (ppm)
Channel Offset Match (mV)
Figure 31.
Figure 32.
OFFSET AND GAIN
vs TEMPERATURE
VCOM VOLTAGE OUTPUT HISTOGRAM
100
50
300
250
200
150
100
50
20
18
16
14
12
10
8
Offset
AVDD = 5V
25 Units, No Load
0
-50
Gain
-100
-150
-200
-250
-300
6
0
4
-50
-100
2
0
-40 -20
0
20
40
60
80
100 120 125
Temperature (°C)
VCOM Voltage Output (V)
Figure 33.
Figure 34.
ADS1274/ADS1278
SAMPLING MATCH ERROR HISTOGRAM
ADS1274 REFERENCE INPUT DIFFERENTIAL
IMPEDANCE vs TEMPERATURE
1.36
1.34
1.32
1.30
1.28
1.26
1.24
1.22
13.6
13.4
13.2
13.0
12.8
12.6
12.4
12.2
40
35
30
25
20
15
10
5
30 units over 3 production lots,
inter-channel combinations.
ADS1278
ADS1274
High-Speed and
High-Resolution Modes
Low-Speed Mode
ADS1278
0
-40 -20
0
20
40
60
80
100 120 125
Temperature (°C)
Sampling Match Error (ps)
Figure 35.
Figure 36.
15
Copyright © 2007, Texas Instruments Incorporated
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