ADS5407IZAY Datasheet, PDF (24/41 Pages) Texas Instruments – Dual Channel 12-Bit 500 Msps Analog to Digital Converter

ADS5407
SLAS934A – MARCH 2013 – REVISED AUGUST 2013
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DECIMATION FILTER
Each channel has a digital filter in the data path as shown in Figure 38. The filter can be programmed as a low-
pass or a high-pass filter and the normalized frequency response of both filters is shown in Figure 39.
500 MSPS
ADC
Lowpass/
Highpass
selection
Low Latency Filter
2
250 MSPS
0, Fs/2
Figure 38.
The decimation filter response has a 0.1dB pass band ripple with approximately 41% pass-band bandwidth. The
stop-band attenuation is approximately 40dB.
10
0
-10
-20
-30
-40
-50
-60
0
Decimation Filter Response
Low Pass Filter
High Pass Filter
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Frequency (MHz)
0.1
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
0
Decimation Filter Response
Low Pass Filter
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
Frequency (MHz)
Figure 39.
24
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