AD7685 Ver la hoja de datos (PDF) - Analog Devices
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AD7685 Datasheet PDF : 28 Pages
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AD7685
TYPICAL PERFORMANCE CHARACTERISTICS
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
250000
200000
POSITIVE INL = +0.33LSB
NEGATIVE INL = –0.50LSB
16384
32768
CODE
49152
Figure 7. Integral Nonlinearity vs. Code
65536
204292
VDD = REF = 5V
150000
100000
50000
29041
27755
0
0 12
20 0
0
0
80E5 80E6 80E7 80E8 80E9 80EA 80EB 80EC 80ED
CODE IN HEX
Figure 8. Histogram of a DC Input at the Code Center
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
8192 POINT FFT
VDD = REF = 5V
fS = 250kSPS
fIN = 20.45kHz
SNR = 93.3dB
THD = –111.6dB
SFDR = –113.7dB
SECOND HARMONIC = –113.7dB
THIRD HARMONIC = –117.6dB
20
40
60
80
100
120
FREQUENCY (kHz)
Figure 9. FFT Plot
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
POSITIVE DNL = +0.21LSB
NEGATIVE DNL = –0.30LSB
16384
32768
CODE
49152
Figure 10. Differential Nonlinearity vs. Code
65536
140000
120000
125055
VDD = REF = 2.5V
100000
80000
60000
60966
59082
40000
20000
0
8667
2 213
6956
179 0 0
0
804E 804F 8050 8051 8052 8053 8054 8055 8056 8057 8058
CODE IN HEX
Figure 11. Histogram of a DC Input at the Code Center
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
16384 POINT FFT
VDD = REF = 2.5V
fS = 250kSPS
fIN = 20.45kHz
SNR = 88.8dB
THD = –103.5dB
SFDR = –104.5dB
SECOND HARMONIC = –112.4dB
THIRD HARMONIC = –105.4dB
20
40
60
80
100
120
FREQUENCY (kHz)
Figure 12. FFT Plot
Rev. C | Page 10 of 28
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