AD1854
–11–REV. A
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
02024681012141618
–60
–65
–105
–85
–90
–95
–100
–75
–80
–70
–110
–115
–120
–125
–130
dBr – A
FREQUENCY – kHz
–135
–140
–145
–150
–155
–160
–60
–65
–105
–85
–90
–95
–100
–75
–80
–70
–110
–115
–120
–125
–130
dBr – B
–135
–140
–145
–150
–155
–160
Figure 13. THD+N at 1 kHz, –0.5 dBFS (8K-Point FFT)
0
20
2468
10 12 14 16 18
–40
–45
–85
–65
–70
–75
–80
–55
–60
–50
–100
–105
dBr – A
FREQUENCY – kHz
–110
–90
–95
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
–100
–105
–110
dBr – B
Figure 14. THD+N vs. Frequency at –0.5 dBFS
0202 4 6 8 10 12 14 16 18
0
–10
–90
–50
–60
–70
–80
–30
–40
–20
–100
–110
–120
–130
–140
dBr – A
FREQUENCY – kHz
–150
–160
0
–10
–90
–50
–60
–70
–80
–30
–40
–20
–100
–110
–120
–130
–140
dBr – B
–150
–160
Figure 15. Dynamic Range: 1 kHz at –60 dBFS
(8K Point FFT)
–120 0–110 –100 –90 –80 –70 –60 –50 –40 –30
0
–60
–80
–40
–20
–100
–120
dBr – A
AMPLITUDE – dBFS
–20 –10
0
–20
–40
–60
–80
–100
–120
dBr – B
Figure 16. THD+N vs. Level at 1 kHz
20 50 100 200 500
1k
dBr – A
2k 5k 10k 20k
FREQUENCY – Hz
–40
–45
–65
–70
–75
–80
–55
–60
–50
–85
–90
dBr – B
–40
–45
–65
–70
–75
–80
–55
–60
–50
–85
–90
Figure 17. Power Supply Rejection to 300 mV p-p on AV
DD
0202 4 6 8 10 12 14 16 18
0
–10
–90
–50
–60
–70
–80
–30
–40
–20
–100
–110
–120
–130
–140
dBr – A
FREQUENCY – kHz
–150
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
dBr – B
–160 –160
Figure 18. Noise Floor, A-Weighted (8K-Point FFT)
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.
