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.
NOISE AND LINEARITY
vs INPUT COMMON-MODE VOLTAGE
NOISE vs TEMPERATURE
Low-Power Mode
14
12
10
8
14
12
10
8
12
10
8
High-Speed Mode
Noise
Low-Speed Mode
6
6
6
Linearity
4
4
4
High-Resolution Mode
2
2
2
0
0
0
-0.5
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Common-Mode Voltage (V)
-40 -20
0
20
40
60
80
100 120 125
Temperature (°C)
Figure 43.
Figure 44.
TOTAL HARMONIC DISTORTION AND NOISE
vs CLK
NOISE vs REFERENCE VOLTAGE
12
10
8
0
14
12
10
8
High-Speed
Low-Power
THD: fIN = fCLK/5120, VIN = -0.5dBFS
Noise: Shorted Input
-20
All Channels Plotted
-40
-60
Low-Speed
6
Noise
-80
6
THD
4
-100
-120
-140
4
High-Resolution
2
0
2
See Electrical Characteristics for VREF Operating Range.
0
0
0.5
1.0
1.5
VREF (V)
Figure 45.
2.0
2.5
3.0
3.5
10k
100k
1M
10M
100M
CLK (Hz)
Figure 46.
COMMON-MODE REJECTION
vs INPUT FREQUENCY
POWER-SUPPLY REJECTION
vs POWER-SUPPLY FREQUENCY
0
0
-20
-40
-20
-40
-60
-60
AVDD
-80
-80
DVDD
-100
-120
-100
-120
IOVDD
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
Input Frequency (Hz)
Power-Supply Modulation Frequency (Hz)
Figure 47.
Figure 48.
17
Copyright © 2007, Texas Instruments Incorporated
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