ADS8028 Datasheet, PDF (9/34 Pages) Texas Instruments – 12-Bit, 1-MSPS, 8-Channel, SAR ADC

ADS8028
www.ti.com
SBAS549B – MAY 2011 – REVISED MARCH 2012
TYPICAL CHARACTERISTICS (continued)
All plots at T_A = +25°C, AVDD = 3.0 V, DVDD = 3.0 V,
f_SAMPLE = 1 MHz, f_SCLK = 20 MHz, and V_REF = 2.5 V internal, unless otherwise noted.
V_REF vs CURRENT LOAD
3
75
SINAD vs V_REF
2.5
2
1.5
1
0.5
0
−11 −9 −7 −5 −3 −1 1 3 5 7 9 11
Current Load (mA)
G007
Figure 8.
72
69
66
63
AVDD = 5 V
DVDD = 5 V
External Reference Mode
60
1 1.5 2 2.5 3 3.5 4 4.5 5
Reference Voltage (V)
G011
Figure 9.
SINAD vs INPUT FREQUENCY FOR VARIOUS SOURCE
IMPEDANCES
74
73
72
71
70
1k
R_IN = 200Ω
R_IN = 100Ω
R_IN = 50Ω
R_IN = 33Ω
R_IN = 0Ω
10k
100k
Input Frequency (dB)
Figure 10.
500k
G012
THD vs INPUT FREQUENCY FOR VARIOUS SOURCE
IMPEDANCES
−70
R_IN = 200Ω
R_IN = 100Ω
R_IN = 50Ω
−75
R_IN = 33Ω
R_IN = 0Ω
−80
−85
−90
1k
10k
100k
Input Frequency (dB)
Figure 11.
500k
G013
PSRR vs POWER-SUPPLY RIPPLE FREQUENCY
−80
CROSSTALK vs INPUT REQUENCY
120
110
−100
100
90
−120
80
−140
1k
10k
100k
1M
10M
Supply Ripple Frequency (Hz)
Figure 12.
100M
G014
70
0
50 100 150 200 250 300 350 400 450 500
Input Frequency (dB)
G015
Figure 13.
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