Datasheet

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SBAS312B − JANUARY 2005 − REVISED AUGUST 2007
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10
TYPICAL CHARACTERISTICS (continued)
AV
DD
= 5V, BV
DD
= 3V, CH x+ = 0.5V to 4.5V, CH x− = 2.5V, REFIN = REFOUT = internal +2.5V, CLKIN = 20MHz, and 16-bit Sinc
3
filter with
decimation by 256, unless otherwise noted.
Figure 14
SPURIOUS FREE DYNAMIC RANGE AND
TOTAL HARMONIC DISTORTION vs TEMPERATURE
(CLKIN = 20MHz)
60−40 −20 20 400
THD
SFDR
80 100
Temperature (
_
C)
SFDR (dB)
105
103
101
99
97
95
93
91
89
87
85
THD (dB)
−105
−103
−
101
−
99
−97
−95
−
93
−
91
−89
−87
−
85
4V
PP
5kHz
Figure 15
SPURIOUS FREE DYNAMIC RANGE AND
TOTAL HARMONIC DISTORTION vs TEMPERATURE
(CLKIN = 32MHz)
60−40 −20 20 400
THD
SFDR
80 100
Temperature (_C)
SFDR (dB)
THD (dB)
105
103
101
99
97
95
93
91
89
87
85
−105
−103
−101
−99
−97
−
95
−
93
−
91
−89
−87
−85
4V
PP
5kHz
Figure 16
SIGNAL−TO−NOISE AND DISTORTION AND
SIGNAL−TO−NOISE RATIO vs INPUT FREQUENCY
(CLKIN = 20MHz)
100 1k 100k
Input Frequency (kHz)
SINAD and SNR (dB)
100
98
96
94
92
90
88
86
84
82
80
SINAD
SNR
OSR = 256
Sinc
3
Filter
Figure 17
SIGNAL−TO−NOISE AND DISTORTION AND
SIGNAL−TO−NOISE RATIO vs INPUT FREQUENCY
(CLKIN = 32MHz)
100 1k 10k 100k
Input Frequency (kHz)
SINAD and SNR (dB)
100
95
90
85
80
SNR
SINAD
OSR = 256
Sinc
3
Filter
Figure 18
SPURIOUS FREE DYNAMIC RANGE AND
TOTAL HARMONIC DISTORTION vs INPUT FREQUENCY
(CLKIN = 20MHz)
10k100 1k 100k
Input Frequency (Hz)
SFDR (dB)
THD (dB)
120
110
100
90
80
−120
−11 0
−100
−90
−80
THD
SFDR
OSR = 256
Sinc
3
Filter
Figure 19
SPURIOUS FREE DYNAMIC RANGE AND
TOTAL HARMONIC DISTORTION vs INPUT FREQUENCY
(CLKIN = 32MHz)
10k100 1k 100k
Input Frequency (Hz)
SFDR (dB)
THD (dB)
120
110
100
90
80
−120
−11 0
−100
−
90
−80
THD
SFDR
OSR = 256
Sinc
3
Filter