AD7949 Просмотр технического описания (PDF) - Analog Devices
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AD7949 Datasheet PDF : 32 Pages
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AD7949
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 2.5 V to 5.5 V, VREF = 2.5 V to 5 V, VIO = 2.3 V to VDD, unless otherwise noted.
1.0
1.0
Data Sheet
0.5
0.5
0
0
–0.5
–0.5
–1.0
0
4,096
8,192
CODES
12,288
16,384
Figure 5. Integral Nonlinearity vs. Code, VREF = VDD = 5 V
300k
250k
261,120
VREF = VDD = 5V
200k
150k
100k
50k
0
0
1FFC
0
0
1
0
0
1FFD 1FFE 1FFF 2000 2001
CODE IN HEX
0
2002
0
2003
Figure 6. Histogram of a DC Input at Code Center
0
–20
VffSINR=E=F251=09Vk.9SDkPDHSz= 5V
SNR = 85.3dB
–40
SINAD = 85.2dB
THD = –100dB
–60
SFDR = 103dB
SECOND HARMONIC = –110dB
THIRD HARMONIC = –103dB
–80
–100
–120
–140
–160
0
25
50
75
100
125
FREQUENCY (kHz)
Figure 7. 20 kHz FFT, VREF = VDD = 5 V
–1.0
0
4,096
8,192
CODES
12,288
16,384
Figure 8. Differential Nonlinearity vs. Code, VREF = VDD = 5 V
300k
250k
259,473
VREF = VDD = 2.5V
200k
150k
100k
50k
0
0
0 955
693
0
1FFC 1FFD 1FFE 1FFF 2000 2001
CODE IN HEX
0
2002
0
2003
0
2004
Figure 9. Histogram of a DC Input at Code Center
0
–20
VffsINR=E=2F01=09kV.9SDkPDHSz= 2.5V
–40
SNR = 84.2dB
SINAD = 82.4dB
–60
THD = –84dB
SFDR = 85dB
SECOND HARMONIC = –100dB
–80
THIRD HARMONIC = –85dB
–100
–120
–140
–160
–180
0
25
50
75
100
FREQUENCY (kHz)
Figure 10. 20 kHz FFT, VREF = VDD = 2.5 V
Rev. F | Page 10 of 32
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