AS1543/44
Data Sheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
V
DD
= 5.25V; V
REF
= 2.5V, C
REF
= 4.7µF, RANGE=1, SE/FDN=1, T
AMB
= +25ºC (unless otherwise specified).
Figure 5. Integral Nonlinearity vs. Digital Output Code
Figure 6. Differential Nonlinearity vs. Digital Output Code
1
f
SAMPLE
= 1Msps
1
0.8
0.6
f
SAMPLE
= 1Msps
0.8
0.6
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0
1024
2048
3072
4096
DNL (LSB)
.
0.4
INL (LSB)
.
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0
1024
2048
3072
4096
Digital Output Code
Digital Output Code
Figure 7. FFT @ 50kHz; RANGE=1, SE/FDN=1
20
0
-20
f
SAMPLE
= 1Msps
N
FFT
= 32768
SNR=72.1dB
THD = -84.7dB
SFDR = 86.2dB
Figure 8. FFT @ 50kHz; RANGE=1, SE/FDN=0
20
0
-20
f
SAMPLE
= 1Msps
N
FFT
= 32768
SNR=71.0dB
THD = -85.5dB
SFDR = 86.5dB
FFT (dBc)
.
FFT (dBc)
.
-40
-60
-80
-100
-120
0
100
200
300
400
500
-40
-60
-80
-100
-120
0
100
200
300
400
500
Input Signal Frequency (kHz)
Input Signal Frequency (kHz)
Figure 9. ENOB vs. V
REFIN
; RANGE=1, SE/FDN=1
11.7
11.6
VDD = 5V
VDD = 3V
Figure 10. ENOB vs. Input Signal Frequency
11.8
11.7
11.6
VDD = 5.25V
ENOB (Bit)
.
ENOB (Bit)
.
11.5
11.4
11.3
11.2
11.1
11
11.5
11.4
11.3
11.2
11.1
11
VDD = 2.7V
VDD = 3.6V
VDD = 4.75V
1
2
3
4
5
10
100
1000
V
REFIN
(V)
Frequency (kHz)
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