ADS5484_2 Datasheet, PDF (21/37 Pages) Texas Instruments – 16-Bit, 170/200-MSPS Analog-to-Digital Converters

ADS5484
ADS5485
www.ti.com ............................................................................................................................................... SLAS610C – AUGUST 2008 – REVISED OCTOBER 2009
10
f_S = 135 MSPS
8
f_IN = 30 MHz
A_IN ≤ −1 dBFS
Normalized to 1.2 VREF
6
Linear Fit: y = −9.8x + 11.8
4
2
0
−2
−4
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
Applied External VREF − V
G057
100
A_IN = −2 dBFS
95
A_IN = −1 dBFS
90
A_IN = −10 dBFS
85
A_IN = −4 dBFS
80
A_IN = −6 dBFS
A_IN = −3 dBFS
75
A_IN = −7 dBFS
70
0.5 0.6 0.7 0.8 0.9
f_S = 135 MSPS
f_IN = 30 MHz
Dither Enabled
Signal Amplitude Relative
to Adjusted Fullscale
1.0 1.1 1.2 1.3 1.4
Applied External VREF − V
G058
Figure 32. Signal Gain Adjustment versus External
Reference (VREF)
Figure 33. SFDR versus External VREF and A_IN
80
78
A_IN = −3 dBFS
A_IN = −4 dBFS
A_IN = −2 dBFS
A_IN = −1 dBFS
76
A_IN = −6 dBFS
74
72 ^{AIN = −7 dBFS}
70
68
66
f_S = 135 MSPS
f_IN = 30 MHz
64
Dither Enabled
62
Signal Amplitude Relative
A_IN = −10 dBFS to Adjusted Fullscale
60
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
Applied External VREF − V
G059
2.3
f_S = 135 MSPS
2.2
f_IN = 30 MHz
Signal Adjusted to −1 dBFS
2.1
2.0
1.9
1.8
1.7
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
Applied External VREF − V
G060
Figure 34. SNR versus External VREF and A_IN
Figure 35. Total Power Consumption versus
External VREF
3.20
3.19
3.18
3.17
3.16
3.15
3.14
3.13
3.12
3.11
3.10
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
Applied External VREF − V
G061
Figure 36. VCM Pin Output versus External VREF
Copyright © 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): ADS5484 ADS5485
Submit Documentation Feedback
21