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.
OUTPUT SPECTRUM
High-Resolution Mode
NOISE HISTOGRAM
25k
20k
15k
10k
5k
0
High-Resolution Mode
-20 Shorted Input
Shorted Input
262,144 Points
262,144 Points
-40
-60
-80
-100
-120
-140
-160
-180
0
1
10
100
1k
10k
100k
Frequency (Hz)
Output (mV)
Figure 7.
Figure 8.
OUTPUT SPECTRUM
OUTPUT SPECTRUM
0
-20
0
Low-Power Mode
fIN = 1kHz, -0.5dBFS
32,768 Points
Low-Power Mode
fIN = 1kHz, -20dBFS
32,768 Points
-20
-40
-40
-60
-60
-80
-80
-100
-120
-140
-160
-100
-120
-140
-160
10
100
1k
10k
100k
10
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
Figure 9.
Figure 10.
OUTPUT SPECTRUM
NOISE HISTOGRAM
0
25k
Low-Power Mode
Low-Power Mode
Shorted Input
-20 Shorted Input
262,144 Points
262,144 Points
20k
15k
10k
5k
-40
-60
-80
-100
-120
-140
-160
-180
0
1
10
100
1k
10k
100k
Frequency (Hz)
Output (mV)
Figure 11.
Figure 12.
11
Copyright © 2007, Texas Instruments Incorporated
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