Datasheet

AD7682/AD7689 Data Sheet
Rev. D | Page 12 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.
1.5
1.0
0.5
0
–0.5
–1.5
–1.0
INL (LSB)
CODES
0 16,384 32,768
49,152 65,536
INL MAX = +0.34 LSB
INL MIN = –0.44 LSB
07353-009
Figure 6. Integral Nonlinearity vs. Code, V
REF
= VDD = 5 V
200k
180k
160k
140k
120k
100k
80k
60k
40k
20k
0
7FFA
COUNTS
CODE IN HEX
7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002
0 0 487 619 0 0 0
σ = 0.50
V
REF
= VDD = 5V
135,326
124,689
07353-007
Figure 7. Histogram of a DC Input at Code Center
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
05025 75 100 125
AMPLITUDE (dB of Full-Scale)
FREQUENCY (kHz)
V
REF
= VDD = 5V
f
S
= 250kSPS
f
IN
= 19.9kHz
SNR = 92.9dB
SINAD = 92.4dB
THD = –102dB
SFDR = 103dB
SECOND HARMONIC = –111dB
THIRD HARMONIC = –104dB
07353-008
Figure 8. 20 kHz FFT, V
REF
= VDD = 5 V
1.5
07353-006
1.0
0.5
0
–0.5
–1.0
0 16,384 32,768
49,152 65,536
DNL (LSB)
CODES
DNL MAX = +0.20 LSB
DNL MIN = –0.22 LSB
Figure 9. Differential Nonlinearity vs. Code, V
REF
= VDD = 5 V
160k
140k
120k
100k
80k
60k
40k
20k
0
COUNTS
CODE IN HEX
7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003
178
6649
51,778
4090
60 1
σ = 0.78
V
REF
= VDD = 2.5V
63,257
135,207
07353-010
Figure 10. 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 = 88.0dB
SINAD = 87.0dB
THD = –89dB
SFDR = 89dB
SECOND HARMONIC = –105dB
THIRD HARMONIC = –90dB
07353-011
Figure 11. 20 kHz FFT, V
REF
= VDD = 2.5 V