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
OUTPUT SPECTRUM
0
-20
0
-20
Low-Speed Mode
Low-Speed Mode
fIN = 100Hz, -0.5dBFS
fIN = 100Hz, -20dBFS
32,768 Points
32,768 Points
-40
-40
-60
-60
-80
-80
-100
-120
-140
-160
-100
-120
-140
-160
1
10
100
1k
10k
1
10
100
1k
10k
Frequency (Hz)
Frequency (Hz)
Figure 13.
Figure 14.
OUTPUT SPECTRUM
NOISE HISTOGRAM
25k
20k
15k
10k
5k
0
Low-Speed Mode
Low-Speed Mode
-20 Shorted Input
Shorted Input
262,144 Points
262,144 Points
-40
-60
-80
-100
-120
-140
-160
-180
0
0.1
1
10
100
1k
10k
Frequency (Hz)
Output (mV)
Figure 15.
Figure 16.
TOTAL HARMONIC DISTORTION
vs FREQUENCY
TOTAL HARMONIC DISTORTION
vs INPUT AMPLITUDE
0
-20
0
-20
High-Speed Mode
VIN = -0.5dBFS
High-Speed Mode
fIN = 1kHz
-40
-40
-60
-60
-80
-80
THD+N
THD
THD+N
THD
-100
-120
-140
-100
-120
-140
10
100
1k
10k
100k
-120
-100
-80
-60
-40
-20
0
Frequency (Hz)
Input Amplitude (dBFS)
Figure 17.
Figure 18.
12
Copyright © 2007, Texas Instruments Incorporated
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