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6.5
FFT Spectrum With –60 dBFS Tone
Reference voltage is 2 Vrms. FFT size 16k.
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This spectrum corresponds to a dynamic range of 104-dB A-weighted. SNR measures to 104 dB
A-weighted, <12 µVrms. 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 µVrms.
6.6
Idle Noise FFT Spectrum
Reference voltage is 2 Vrms. FFT size 16k.
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SLOU215 – January 2008
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2k
4k
6k
8k
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Figure 14. FFT Spectrum With –60-dBFS Tone
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10k
20k
30k
Figure 15. Idle Noise FFT Spectrum (BTL)
10k
14k
16k
12k
f - Frequency - Hz
40k
50k
60k
70k
f - Frequency - Hz
DRV601EVM Performance
18k
22k
20k
80k
90k
DRV601EVM
13
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