AD1854
TYPICAL PERFORMANCE
Figures 13 through 20 illustrate the typical analog performance
of the AD1854 as measured by an Audio Precision System Two.
Signal-to-Noise and THD+N performance are shown under a
range of conditions. Figure 14 shows the power supply rejection
–60
–65
–70
–75
–80
–85
–90
–95
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–105
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–125
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–160
0
2
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12
14
FREQUENCY – kHz
16
18
–60
–65
–70
–75
–80
–85
–90
–95
–100
–105
–110
–115
–120
–125
–130
–135
–140
–145
–150
–155
–160
20
performance of the AD1854. Figure 15 shows the noise floor of
the AD1854. The digital filter transfer function is shown in
Figure 16. The two-tone test in Figure 17 is per the SMPTE
Standard for Measuring Intermodulation Distortion.
0
0
–20
–20
–40
dBr – A
–40
dBr – B
dBr – B
dBr – A
dBr – B
–60
–60
–80
–80
–100
–100
–120
–120 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10
AMPLITUDE – dBFS
–120
0
Figure 13. THD+N at 1 kHz, –0.5 dBFS (8K-Point FFT)
Figure 16. THD+N vs. Level at 1 kHz
–40
–45
–50
–55
–60
–65
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–105
0
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14
8
FREQUENCY – kHz
16
18
–110
20
–40
–45
–50
–55
dBr – B
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–45
–50
–55
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–85
50
100
200
2k
500 1k
FREQUENCY – Hz
5k
10k
20k
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dBr – B
dBr – A
–75
–80
–85
–90
–95
dBr – A
–70
–60
–65
–70
–75
–80
–85
–90
20
–100
–105
–110
Figure 14. THD+N vs. Frequency at –0.5 dBFS
Figure 17. Power Supply Rejection to 300 mV p-p on AV
DD
0
–10
–20
–30
–40
–50
–60
dBr – A
–70
–80
–90
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
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–140
–150
–160
dBr – B
dBr – A
0
–10
–20
–30
–40
–50
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–70
–80
–90
0
–10
–20
–30
–40
–50
–60
–70
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–110
–120
–130
–140
–150
–160
–100
–110
–120
–130
–140
–150
–160
–80
–90
–100
–110
–120
–130
–140
–150
0
2
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14
FREQUENCY – kHz
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18
–160
20
0
2
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14
FREQUENCY – kHz
16
18
20
Figure 15. Dynamic Range: 1 kHz at –60 dBFS
(8K Point FFT)
REV. A
Figure 18. Noise Floor, A-Weighted (8K-Point FFT)
–11–
AD [ ANALOG DEVICES ]
