Datasheet

AD7661
Rev. 0 | Page 14 of 28
86
87
88
89
90
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
SNR, S/[N+D] (dB)
13.5
14.0
14.5
15.0
15.5
ENOB (Bits)
SNR
S/
[
N+D
]
ENOB
03033-0-017
Figure 17. SNR, S/(N+D), and ENOB vs. Temperature
–120
–115
–110
–105
–100
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
THD, HARMONICS (dB)
03033-0-018
THD
SECOND
HARMONIC
THIRD
HARMONIC
Figure 18. THD and Harmonics vs. Temperature
SAMPLE RATE (SPS)
10
02965-0-036
100 10000 100000
10
1000
100
1000
10000
0.001
1
0.01
OPERATING CURRENT (µA)
AVDD
OVDD
DVDD
PDREF = PDBUF = HIGH
0.1
03033-0-019
Figure 19. Operating Current vs. Sample Rate
–6
–5
–4
–3
–2
–1
0
1
2
3
4
5
6
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
ZERO ERROR, FULL-SCALE ERROR (LSB)
FULL-SCALE ERROR
ZERO ERROR
03033-0-039
Figure 20. Zero Error, Full Scale Error with Reference vs. Temperature
–40 –20
TEMPERATURE (°C)
VREF (V)
03033-0-047
2.4980
2.4985
2.4990
2.4995
2.5000
2.5005
2.5010
2.5015
0 20 40 60 80 100 120
Figure 21.Typical Reference Voltage Output vs. Temperature (3 Units)
60
10
20
30
REFERENCE DRIFT (ppm/°C)
NUMBER OF UNITS
03033-0-046
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
50
40
Figure 22. Reference Voltage Temperature Coefficient Distribution (291 Units)