0
50
Frequency (Hz)
0
-
20
-
40
-
60
-
80
-
180
Amplitude (dB)
100
150
500
250
350
450
200
300
400
-
100
-
120
-
140
-
160
8192-Point FFT
20mV
SNR = 124.2dB
DC
10
20
Input Frequency (Hz)
-
-
-
-
-
-
-
100
105
110
115
120
125
130
T
otal Harmonic Distortion (dB)
30
40
100
60
80
50
70
90
V
= 0.5dBFS
IN
-
THD Limited by
Signal Generator
PGA = 1
PGA = 8
0
50
Frequency (Hz)
0
-
20
-
40
-
60
-
80
-
180
Amplitude (dB)
100
150
500
250
350
450
200
300
400
-
100
-
120
-
140
-
160
8192-Point FFT
V
= 0.5dBFS, 31.25Hz
PGA = 16
THD = 122.4dB
IN
-
-
0
50
Frequency (Hz)
0
-
20
-
40
-
60
-
80
-
180
Amplitude (dB)
100
150
500
250
350
450
200
300
400
-
100
-
120
-
140
-
160
8192-Point FFT
Shorted Input
SNR = 124.0dB
0
50
Frequency (Hz)
0
-
20
-
40
-
60
-
80
-
180
Amplitude (dB)
100
150
500
250
350
450
200
300
400
-
100
-
120
-
140
-
160
8192-Point FFT
V
= 0.5dBFS, 31.25Hz
PGA = 1
THD = 124.0dB
IN
-
-
0
50
Frequency (Hz)
0
-
20
-
40
-
60
-
80
-
180
Amplitude (dB)
100
150
500
250
350
450
200
300
400
-
100
-
120
-
140
-
160
8192-Point FFT
V
= 20dBFS, 31.25Hz
PGA = 1
THD = 120.1dB
IN
-
-
SBAS418I – SEPTEMBER 2007 – REVISED MARCH 2015
8 Typical Characteristics
At +25°C, AVDD = +2.5V, AVSS = –2.5V, f
CLK
= 4.096MHz, VREFP = +2.5V, VREFN = –2.5V, DVDD = +3.3V, PGA = 1,
CAPN – CAPP = 10nF, and f
DATA
= 1000SPS, unless otherwise noted.
Figure 1. Output Spectrum
Figure 2. Output Spectrum
Figure 3. Output Spectrum
Figure 4. Output Spectrum
Figure 5. Output Spectrum
Figure 6. THD vs Input Frequency
Copyright © 2007–2015, Texas Instruments Incorporated
7
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