Datasheet

−140
−120
−100
−80
−60
−40
−20
0
0 50 100 150 200 250 300 350 400 450 500
Input Frequency (kHz)
Amplitude (dB)
f
SAMPLE
= 1.176 MHz
f
IN
= 41.68 kHz
f
SCLK
= 20 MHz
SNR = 72.7 dB
THD = −93.6 dB
G000
−0.6
−0.4
−0.2
0
0.2
0.4
0.6
1 1.5 2 2.5 3 3.5 4 4.5 5
Maximum INL
Minimum INL
Reference Voltage (V)
Intergral Nonlinearity (LSB)
AVDD = 5 V
DVDD = 5 V
External Reference Mode
G001
−1
−0.8
−0.6
−0.4
−0.2
0
0.2
0.4
0.6
0.8
1
0 512 1024 1536 2048 2560 3072 3584 4096
ADC Output Code (LSB)
Intergral Nonlinearity (LSB)
G002
−0.6
−0.4
−0.2
0
0.2
0.4
0.6
1 1.5 2 2.5 3 3.5 4 4.5 5
Maximum DNL
Minimum DNL
Reference Voltage (V)
Differential Nonlinearity (LSB)
AVDD = 5 V
DVDD = 5 V
External Reference Mode
G003
−1
−0.8
−0.6
−0.4
−0.2
0
0.2
0.4
0.6
0.8
1
0 512 1024 1536 2048 2560 3072 3584 4096
ADC Output Code (LSB)
Differential Nonlinearity (LSB)
G004
8
9
10
11
12
1 2 3 4 5
Reference Voltage (V)
Effective Number Of Bits (ENOB)
AVDD = 5 V
DVDD = 5 V
External Reference Mode
G006
ADS8028
SBAS549B –MAY 2011–REVISED MARCH 2012 www.ti.com
TYPICAL CHARACTERISTICS
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.
TYPICAL FFT INL vs V
REF
Figure 2. Figure 3.
TYPICAL ADC INL DNL vs V
REF
Figure 4. Figure 5.
TYPICAL ADC DNL ENOB vs V
REF
Figure 6. Figure 7.
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