Datasheet

AD7766
Rev. C | Page 12 of 24
–120
–116
–112
–108
–104
01900k800k700k600k500k400k300k200k100k
THD (dB)
MCLK FREQUENCY (Hz)
06449-113
M
AD7766
AD7766-1
AD7766-2
Figure 19. AD7766/AD7766-1/AD7766-2 THD vs. MCLK Frequency
06449-114
115
107
108
109
110
111
112
113
114
01M900k800k700k600k500k400k300k200k100k
SNR (dB)
MCLK FREQUENCY (Hz)
AD7766
AD7766-1
AD7766-2
Figure 20. AD7766/AD7766-1/AD7766-2 SNR vs. MCLK Frequency
150
140
130
120
110
100
0650k40k30k20k10k
PSRR (dB)
f
NOISE
(Hz)
AV
DD
DV
DD
V
DRIVE
0k
06449-117
Figure 21. AD7766 Power Supply Sensitivity vs. Supply Ripple Frequency
(f
NOISE
) with Decoupling Capacitors
120
115
110
105
100
95
90
0650k40k30k20k10k
CMRR (dB)
f
NOISE
(Hz)
0k
OPEN INPUTS
FULL-SCALE 921Hz
DYNAMIC RANGE
06449-116
Figure 22. AD7766 CMRR vs. Common-Mode Ripple Frequency (f
NOISE
)
200
160
120
80
40
180
140
100
60
20
0
OCCURRENCE
CODES
8,388,493 8,388,497 8,388,501 8,388,505 8,388,509 8,388,513 8,388,517 8,388,521 8,388,525 8,388,529 8,388,533 8,388,537 8,388,541 8,388,545 8,388,549 8,388,553 8,388,557 8,388,561 8,388,565 8,388,569 8,388,573 8,388,577 8,388,581 8,388,585 8,388,589 8,388,593 8,388,597 8,388,601 8,388,605 8,388,609 8,388,613 8,388,617 8,388,621 8,388,625 8,388,629 8,388,633 8,388,637
MAX = 8,388,637
MIN = 8,388,493
SPREAD = 145
06449-118
Figure 23. AD7766 24-Bit Histogram
250
200
150
100
50
0
OCCURRENCE
CODES
MAX = 8,388,608
MIN = 8,388,507
SPREAD = 102 CODES
8,388,508 8,388,512 8,388,516 8,388,520 8,388,524 8,388,528 8,388,532 8,388,536 8,388,540 8,388,544 8,388,548 8,388,552 8,388,556 8,388,560 8,388,564 8,388,568 8,388,572 8,388,576 8,388,580 8,388,584 8,388,588 8,388,592 8,388,596 8,388,600 8,388,604 8,388,608
06449-119
Figure 24. AD7766-1 24-Bit Histogram