ADS5294 Datasheet, PDF (23/67 Pages) Texas Instruments – Octal Channel 14-Bit, 80 MSPS High-SNR and Low-Power ADC

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ADS5294
SLAS776B – NOVEMBER 2011 – REVISED JULY 2012
TYPICAL CHARACTERISTICS (continued)
Typical values are at 25°C, AVDD = 1.8 V, LVDD = 1.8V, 50% clock duty cycle, –1 dBFS differential analog input, 14 Bit/80
MSPS, ADC is configured in the internal reference mode, unless otherwise noted.
40
0
Low Pass
SNR = 78.2 dBFS
30
Band−Pass1
−10
SINAD = 78.2 dBFS
20
Band−Pass2
−20
High Pass
Decimate by 2 Filter Enabled
−30
10
−40
0
−50
−10
−60
−20
−70
−30
−80
−40
−90
−100
−50
−110
−60
−120
−70
−130
−80
0.0
0.1
0.2
0.3
0.4
0.5
Normalized frequency (fin/fs)
−140
0
5
10
15
20
Frequency (MHz)
Figure 32. Filter Response, Decimate by 4
Figure 33. FFT for 5 MHz Input Signal, Sample
Rate = 80 MSPS with Decimation Filter = 2
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
−110
−120
−130
−140
0
SNR = 77.9 dBFS
SINAD = 77.9 dBFS
SFDR = 93.13 dBc
THD = −96 dBc
2 Channels averaged
5 10 15 20 25 30 35 40
Frequency (MHz)
Figure 34. FFT for 5 MHz Input Signal, Sample
Rate = 80 MSPS by Averaging 2 Channels
3
0
−3
−6
−9
−12
−15
−18
−21
−24
−27
−30
−33
−36
−39
−42
−45
0.02
0.1
1
Input Signal Frequency (MHz)
K=2
K=3
K=4
K=5
K=6
K=7
K=8
K=9
K=10
10 15
Figure 35. Digital High-Pass Filter Response
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