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6.5 FFT Spectrum With –60 dBFS Tone
0
22k2k 4k 6k
8k
10k
12k
14k 16k 18k
20k
f-Frequency-Hz
-150
0
-140
-130
-120
-110
-100
-90
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-60
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-40
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-10
Amplitude-dB
6.6 Idle Noise FFT Spectrum
0 90k10k 20k 30k 40k 50k 60k 70k 80k
f-Frequency-Hz
-150
0
-140
-130
-120
-110
-100
-90
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Amplitude-dB
DRV601EVM Performance
Reference voltage is 2 Vrms. FFT size 16k.
Figure 14. FFT Spectrum With –60-dBFS Tone
This spectrum corresponds to a dynamic range of 104-dB A-weighted. SNR measures to 104 dB
A-weighted, <12 µ Vrms. This noise floor is dominated by the feedback resistor network impedance level.
This can be improved by lowering the impedance level, a 10x lower impedance level lowers the noise floor
to 110 dB, <6 µ Vrms.
Reference voltage is 2 Vrms. FFT size 16k.
Figure 15. Idle Noise FFT Spectrum (BTL)
SLOU215 – January 2008 DRV601EVM 13
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