Datasheet

AD7949 Data Sheet
Rev. D | Page 10 of 32
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 2.5 V to 5.5 V, V
REF
= 2.5 V to 5 V, VIO = 2.3 V to VDD, unless otherwise noted.
1.0
0.5
0
–0.5
–1.0
0 4,096 8,192
12,288 16,384
INL (LSB)
CODES
07351-005
Figure 5. Integral Nonlinearity vs. Code, V
REF
= VDD = 5 V
300k
250k
200k
150k
100k
50k
0
1FFC
COUNTS
CODE IN HEX
1FFD 1FFE 1FFF 2000 2001 2002 2003
00010000
V
REF
= VDD = 5V
261,120
07351-006
Figure 6. Histogram of a DC Input at Code Center
0
–20
–40
–60
–80
–100
–120
–140
–160
05025 75 100 125
AMPLITUDE (dB of Full-Scale)
FREQUENCY (kHz)
V
REF
= VDD = 5V
f
S
= 250kSPS
f
IN
= 19.9kHz
SNR = 85.3dB
SINAD = 85.2dB
THD = –100dB
SFDR = 103dB
SECOND HARMONIC = –110dB
THIRD HARMONIC = –103dB
07351-007
Figure 7. 20 kHz FFT, V
REF
= VDD = 5 V
DNL (LSB)
CODES
0 4,096 8,192
12,288 16,384
1.0
0.5
0
–0.5
–1.0
07351-008
Figure 8. Differential Nonlinearity vs. Code, V
REF
= VDD = 5 V
COUNTS
CODE IN HEX
259,473
300k
250k
200k
150k
100k
50k
0
1FFC
1FFD 1FFE 1FFF 2000 2001 2002 2003 2004
000
955 693
000
V
REF
= VDD = 2.5V
07351-009
Figure 9. Histogram of a DC Input at Code Center
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
05025 75 100
AMPLITUDE (dB of Full-Scale)
FREQUENCY (kHz)
V
REF
= VDD = 2.5V
f
s
= 200kSPS
f
IN
= 19.9kHz
SNR = 84.2dB
SINAD = 82.4dB
THD = –84dB
SFDR = 85dB
SECOND HARMONIC = –100dB
THIRD HARMONIC = –85dB
07351-010
Figure 10. 20 kHz FFT, V
REF
= VDD = 2.5 V