ADS7881 Datasheet, PDF (13/26 Pages) Texas Instruments – 12-BIT, 4-MSPS LOW POWER SAR ANALOG-TO-DIGITAL CONVERTER

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TYPICAL CHARACTERISTICS⁽¹⁾
ADS7881
SLAS400 − SEPTEMBER 2003
HISTOGRAM
(DC CODE SPREAD AT THE CENTER OF CODE)
140000
120000
+VA = 5 V,
+VBD = 5 V,
Code = 2048,
TA = 255C
Count = 130879
100000
EFFECTIVE NUMBER OF BITS
vs
FREE-AIR TEMPERATURE
12
fi = 100 kHz,
11.9 +VA = 5 V,
+VBD = 5 V
11.8
11.7
80000
11.6
11.5
60000
11.4
40000
20000
0
Count
=0
2046
Count
=1
2047
2048
Code
Figure 13
Count
= 192
2049
Count
=0
2050
11.3
11.2
11.1
11
−40 −20 0
20
40
60
80
TA − Free-Air Temperature − °C
Figure 14
SIGNAL-TO-NOISE AND DISTORTION
vs
FREE-AIR TEMPERATURE
72
fi = 100 kHz,
+VA = 5 V,
+VBD = 5 V
71.8
71.6
71.4
71.2
71
−40 −20
0
20
40
60
80
TA − Free-Air Temperature − °C
Figure 15
72
71.9
71.8
71.7
71.6
71.5
71.4
71.3
71.2
71.1
71
−40
SIGNAL-TO-NOISE RATIO
vs
FREE-AIR TEMPERATURE
fi = 100 kHz,
+VA = 5 V,
+VBD = 5 V
−20 0
20
40
60
80
TA − Free-Air Temperature − °C
Figure 16
(1) _{At sample rate = 4 MSPS, Vref = 2.5 V external, unless otherwise specified.}
13