THS4541 Datasheet, PDF (48/62 Pages) Texas Instruments – Fully Differential Amplifier

THS4541
SLOS375 – AUGUST 2014
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Typical Applications (continued)
is shown in Figure 81, where the jumper is placed from pins 2 to 3. The reported SNR of 70.09 dBFs is only a
slight reduction from the tested ADC-only performance of 70.42 dBFs, showing the value of the interstage noise
bandwidth limiting filter. The exceptionally low harmonic distortion for the THS4541 also shows up in the very low
SFDR and THD shown in Figure 81. This 96-dB SFDR and 92.83-dB THD are comparable to the ADC-only test
results.
10.2.2.3 Application Curve
0
-10
SNR = 70.1 dBFS
SFDR = 96 dBFS
-20
THD = 92.83 dBFS
-30
ENOB = 11.35 bits
-40
-50
-60
-70
-80
-90
-100
-110
0
5
10
15
20
25
Frequency (MHz)
D066
SNR = 70.1 dBFS, SFDR = 96 dBFS, THD = 92.83 dBFS, ENOB = 11.35 bits
Figure 81. 5-MHz FFT, 50-MSPS Test for the Gain of 2 Interface in Figure 80
48
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