ADS8331_1003 Datasheet, PDF (17/40 Pages) Texas Instruments – Low-Power, 16-Bit, 500kSPS, 4-/8-Channel Unipolar Input ANALOG-TO-DIGITAL CONVERTERS with Serial Interface

ADS8331
ADS8332
www.ti.com
SBAS363 – DECEMBER 2009
TYPICAL CHARACTERISTICS: AC Performance (continued)
At T_A = +25°C, V_REF (REF+ – REF–) = 4.096V when VA = VBD = 5V or V_REF (REF+ – REF–) = 2.5V when VA = VBD = 2.7V,
f_SCLK = 21MHz, f_SAMPLE = 500kSPS, and f_IN = 10kHz, unless otherwise noted.
EFFECTIVE NUMBER OF BITS
vs INPUT FREQUENCY
POWER-SUPPLY REJECTION RATIO
vs POWER-SUPPLY RIPPLE FREQUENCY
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
11.5
11.0
1
VA = VBD = 5.0V
V_REF = 4.096V
VA = VBD = 2.7V
V_REF = 2.500V
10
f_IN (kHz)
100
250
95
90
V_RIPPLE = 0.5V_PP
85
80
VA = VBD = 2.7V
V_REF = 2.500V
75
70
65
VA = VBD = 5.0V
60
V_REF = 4.096V
55
50
45
40
35
0.1
1
10
100
500
Ripple Frequency (kHz)
Figure 31.
Figure 32.
-95
-100
-105
-110
-115
-120
-125
-130
1
CROSSTALK
vs INPUT FREQUENCY
VA = VBD = 5.0V
V_REF = 4.096V
VA = VBD = 2.7V
V_REF = 2.500V
10
f_IN (kHz)
Figure 33.
100
250
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