AD1855

–11–

REV. B

TYPICAL PERFORMANCE

Figures 12 through 15 illustrate the typical analog performance

sion System Two. Signal-to-Noise and THD+N performance

are shown under a range of conditions. Figure 16 shows the

power supply rejection performance of the AD1855. Figure 17

shows the noise floor of the AD1855. The digital filter transfer

function is shown in Figure 18. The two-tone test in Figure 19

is per the SMPTE Standard for Measuring Intermodulation

Distortion.

020

2468

10

12

14

16

18

0

–10

–90

–50

–60

–70

–80

–30

–40

–20

–100

–110

–120

–130

–140

FREQUENCY – kHz

–150

–160

Figure 12. 1 kHz Tone at –0.5 dBFS (8K-Point FFT)

0

20

246

8

10

12

14

16

18

–40

–45

–85

–65

–70

–75

–80

–55

–60

–50

–100

–105

FREQUENCY – kHz

22

–110

–90

–95

–40

–45

–50

–55

–60

–65

–70

–75

–80

–85

–90

–95

–100

–105

–110

Figure 13. THD+N vs. Frequency at –0.5 dBFS

020

2

4

6

8

10

12

14

16

18

0

–10

–90

–50

–60

–70

–80

–30

–40

–20

–100

–110

–120

–130

–140

FREQUENCY – kHz

–150

–160

0

–10

–90

–50

–60

–70

–80

–30

–40

–20

–100

–110

–120

–130

–140

–150

–160

Figure 14. Dynamic Range: 1 kHz at –60 dB

–120

0

–110 –100 –90 –80 –70 –60 –50 –40 –30

0

–60

–80

–40

–20

–100

–120

AMPLITUDE – dBFS

–20 –10

0

–20

–40

–60

–80

–100

–120

Figure 15. THD+N vs. Amplitude at 1 kHz