SBAS356A – JUNE 2007 – REVISED SEPTEMBER 2007
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TYPICAL CHARACTERISTICS: V
DD
= +5V (continued)
At T
A
= 25°C, V
REF
= 2.5V, f
SAMPLE
= 250kHz, f
CLK
= 24
×
f
SAMPLE
, unless otherwise noted.
SPURIOUS-FREE DYNAMIC RANGE
AND TOTAL HARMONIC DISTORTION
vs INPUT FREQUENCY
120
115
110
105
SFDR (dB)
EFFECTIVE NUMBER OF BITS
vs INPUT FREQUENCY
-120
15.0
14.5
14.0
13.5
13.0
12.5
12.0
1
10
Frequency (kHz)
100
200
-115
-110
-105
THD (dB)
ENOB (Bits)
SFDR
100
95
90
85
80
75
70
65
1
NOTE: (1) First nine harmonics of the input frequency.
10
Frequency (kHz)
100
200
THD
(1)
-100
-95
-90
-85
-80
-75
-70
-65
Figure 14.
CHANGE IN SIGNAL-TO-NOISE + DISTORTION
vs TEMPERATURE
0.7
0.6
0.5
Delta from +25
°
C (LSB)
Figure 15.
CHANGE IN SIGNAL-TO-NOISE + DISTORTION
vs INPUT LEVEL
100
90
80
f
IN
= 1.98364kHz
f
IN
= 1.98364kHz,
-0.2dB
0.4
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-50
-25
0
25
50
75
100
Temperature (
°
C)
SINAD (dB)
0.3
70
60
50
40
30
20
10
-80
-70
-60
-50
-40
-30
-20
-10
0
Input Level (dB)
Figure 16.
PEAK-TO-PEAK NOISE FOR A DC INPUT
vs REFERENCE VOLTAGE
100
V
DD
= 5V
Peak-to-Peak Noise (LSB)
Figure 17.
OUTPUT CODE HISTOGRAM FOR A DC INPUT
(8192 Conversions)
4835
10
1673
1608
34
42
FFFF
0000
Code (Hex)
0001
0002
1
0.1
Reference Voltage (V)
1
2
2.5
FFFE
Figure 18.
Figure 19.
12
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