ADS8578S Datasheet, PDF (46/58 Pages) Texas Instruments – 14-Bit, High-Speed, 8-Channel, Simultaneous-Sampling ADC with Bipolar Inputs on a Single Supply

ADS8578S
SBAS825 – APRIL 2017
www.ti.com
In OSR modes, the device adds a digital filter at the output of the ADC. The digital filter affects the frequency
response of the entire data acquisition system including the internal low-pass analog filter and the oversampling
digital filter. Figure 78 to Figure 83 show the frequency response curves for different OSR settings in the ±10-V
range.
50
0
-50
-100
-150
-200
-250
1
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
D068
AVDD = 5 V, DVDD = 5 V, T_A = 25°C, input range = ±10 V
Figure 78. Digital Filter Response for OSR = 2
50
0
-50
-100
-150
-200
-250
1
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
D070
AVDD = 5 V, DVDD = 5 V, T_A = 25°C, input range = ±10 V
Figure 80. Digital Filter Response for OSR = 8
50
0
-50
-100
-150
-200
-250
1
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
D072
AVDD = 5 V, DVDD = 5 V, T_A = 25°C, input range = ±10 V
Figure 82. Digital Filter Response for OSR = 32
50
0
-50
-100
-150
-200
-250
1
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
D069
AVDD = 5 V, DVDD = 5 V, T_A = 25°C, input range = ±10 V
Figure 79. Digital Filter Response for OSR = 4
50
0
-50
-100
-150
-200
-250
1
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
D071
AVDD = 5 V, DVDD = 5 V, T_A = 25°C, input range = ±10 V
Figure 81. Digital Filter Response for OSR = 16
50
0
-50
-100
-150
-200
-250
1
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
D073
AVDD = 5 V, DVDD = 5 V, T_A = 25°C, input range = ±10 V
Figure 83. Digital Filter Response for OSR = 64
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