ADS5281 Datasheet, PDF (29/41 Pages) Texas Instruments – 12-Bit Octal-Channel ADC Family Up to 65MSPS

ADS5281
ADS5282
www.ti.com
SBAS397E – DECEMBER 2006 – REVISED JANUARY 2008
TYPICAL CHARACTERISTICS (continued)
At T_A = +25°C, AVDD = +3.3V, LVDD = 1.8V, clock frequency = 65MSPS, differential clock mode, 1V_PP clock amplitude, 50%
clock duty cycle, input frequency = 10MHz, –1dBFS differential analog input, 0dB digital gain setting, 1.5V analog input
common-mode, low-frequency noise suppression = off, internal reference mode, I_SET resistor = 56.2kΩ, and LVDS buffer
current setting = 3.5mA, unless otherwise noted.
INTEGRAL NONLINEARITY
0.75
0.55
f_S = 65MSPS
f_IN = 5MHz
DIFFERENTIAL NONLINEARITY
0.35
f_S = 65MSPS, f_IN = 5MHz
0.25
0.35
0.15
0.15
0.05
-0.05
-0.05
-0.25
-0.15
-0.45
-0.25
-0.65
0
512 1024 1536 2048 2560 3072 3584 4096
Code (LSB)
Figure 28.
-0.35
0
512 1024 1536 2048 2560 3072 3584 4096
Code (LSB)
Figure 29.
AVDD AND LVDD POWER-SUPPLY CURRENTS
vs CLOCK FREQUENCY
170
Zero Input on All Channels
150 ^{Internal Reference Mode}
IAVDD
130
110
90
ILVDD
70
50
30
5
15
25
35
45
55
65
75
Clock Frequency (MSPS)
Figure 30.
OVERLOAD RECOVERY AT 50MSPS
0.70
0.68
0.66
f_S = 50MSPS
f_IN = 5MHz
Standard Deviation of
2nd Point After Overload
0.64
0.62
0.60
0.58
0.56
0.54
0.52
0.50
0
Standard Deviation of
1st Point After Overload
1
2
3
4
5
6
Overload Signal Amplitude (dBFS)
Figure 31.
OVERLOAD RECOVERY AT 65MSPS
0.64
0.62
f_S = 65MSPS
f_IN = 5MHz
Standard Deviation of
1st Point After Overload
0.60
0.58
0.56
0.54
0.52
0
Standard Deviation of
2nd Point After Overload
1
2
3
4
5
Overload Signal Amplitude (dBFS)
Figure 32.
16384 tS (Group 1)
First point after overload (Set 1)
Second point after overload (Set 1)
+FS
Set 1, Point 1 (of 16)
tS
Set 1, Point 2 (of 16)
Overload
Amplitude
-FS
Second point after overload (Set 2)
First point after overload (Set 2)
NOTES:
Input sine wave phase is repetitive over 16384 clock cycles.
16 such repetitive groups (of 16384 clock cycles) are captured–a total of 262,144 points.
Standard deviation of every set of first and second points after overload are analyzed over the 16 groups.
6
Worst case of all such standard deviations are plotted in the graphs.
Figure 33. Overload Recovery
Copyright © 2006–2008, Texas Instruments Incorporated
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