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AD1954YSTRL Folha de dados(PDF) 8 Page - Analog Devices |
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AD1954YSTRL Folha de dados(HTML) 8 Page - Analog Devices |
8 / 36 page –8– AD1954–Typical Performance Characteristics 0 –160 0 20 2 4 6 8 14 16 18 –20 –80 –120 –40 –60 –100 –140 10 12 kHz TPC 1. FFT of Full-Scale Sine Wave (32k Points) 0 –160 0 20 2 4 6 8 14 16 18 –20 –80 –120 –40 –60 –100 –140 10 12 kHz TPC 2. FFT of –60 dB Sine Wave (32k Points) Hz 0 –20 20 10k –10 1k 100 –2 –4 –6 –8 –12 –14 –16 –18 50 200 500 5k 2k TPC 3. Frequency Response of EQ Biquad Filters 3.0 –3.0 –120 0 –100 –80 –20 0.5 –1.0 –2.0 0 –0.5 –1.5 –2.5 –60 –40 dBFS 2.5 1.5 2.0 1.0 TPC 4. Linearity Plot –2.0 –120 0 –100 –80 –20 –60 ms –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0 TPC 5. Tone-Burst Response with Compressor Threshold Set to –20 dB PERFORMANCE PLOTS The following plots demonstrate the performance achieved on the actual silicon.TPC 1 shows an FFT of a full-scale 1 kHz signal, with a THD+N of –100 dB, which is dominated by a second harmonic.TPC 2 shows an FFT of a –60 dB sine wave, demon- strating the lack of low-level artifacts.TPC 3 shows a frequency response plot with the seven equalization biquads set to an alter- nating pattern of 6 dB boosts and cuts.TPC 4 shows a linearity plot, where the measurement was taken with the same equalization curve used to make TPC 3.When the biquad filters are not in use, the signal passes through the filters with no quantization effects. TPC 4 therefore demonstrates that using double-precision math in the biquad filters has virtually eliminated any quantization artifacts.TPC 5 shows a tone-burst applied to the compressor, with the attack and recovery characteristics plainly visible.The rms detector was programmed for normal rms time constants; the hold/decay feature was not used for this plot. REV. A |
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