Datasheet

AD7686
Rev. B | Page 9 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
CODE
INL (LSB)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0 16384 32768 49152 65535
02969-007
POSITIVE INL = +0.52LSB
NEGATIVE INL = –0.38LSB
Figure 7. Integral Nonlinearity vs. Code
02969-008
COUNTS
250000
200000
150000
100000
50000
0
CODE IN HEX
802B 802C 802D 802E8026 8027 8028 8029 802A
0026 00
202719
30770
27583
22
VDD = REF = 5V
Figure 8. Histogram of a DC Input at the Code Center
02969-009
FREQUENCY (kHz)
1200 20 40 60 80 100 200 220 240140 160 180
AMPLITUDE (dB OF FULL SCALE)
0
–20
–40
–60
–80
–100
–120
–160
–140
–180
8192 POINT FFT
VDD = REF = 5V
f
S
= 500kSPS
f
IN
= 19.99kHz
SNR = 92.8dB
THD = –108.7dB
SECOND HARMONIC = –110.1dB
THIRD HARMONIC = –119.2dB
Figure 9. FFT Plot
CODE
DNL (LSB)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0 16384 32768 49152 65535
02969-010
POSITIVE DNL = +0.35LSB
NEGATIVE DNL = –0.36LSB
Figure 10. Differential Nonlinearity vs. Code
02969-011
COUNTS
160000
140000
120000
100000
60000
80000
20000
40000
0
CODE IN HEX
802B8024 80268025 8027 8028 8029 802A
0 0 1703 0 0
124164
133575
1678
VDD = REF = 5V
Figure 11. Histogram of a DC Input at the Code Transition
02969-012
INPUT LEVEL (dB)
0–10–8–6–4–2
THD (dB)
–120
–
105
–108
–111
–114
–117
SNR (dB)
95
94
93
92
91
90
SNR
THD
Figure 12. SNR and THD vs. Input Level