Datasheet

AD7666
Rev. 0 | Page 14 of 28
03034-0-017
13.0
13.5
14.0
14.5
15.0
15.5
ENOB (Bits)
87
88
89
90
92
SNR, S/[N+D] (dB)
–55 –35 –15 5 25 45 65 85 105 125
SNR
S/[N+D]
ENOB
TEMPERATURE (°C)
91
Figure 17. SNR, S/(N+D), and ENOB vs. Temperature
03034-0-018
–115
–110
–105
–100
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
THD, HARMONICS (dB)
THD
SECOND
HARMONIC
THIRD
HARMONIC
Figure 18. THD and Harmonics vs. Temperature
03034-0-019
0.001
0.01
0.1
10
100
1000
10000
100000
10 100 1k 10k 100k 1M
SAMPLING RATE (SPS)
OPERATING CURRENTS (µA)
1
DVDD
OVDD
AVDD
PDREF = PDBUF = HIGH
Figure 19. Operating Current vs. Sample Rate
03034-0-020
FULL-SCALE
ERROR
ZERO ERROR
–6
–5
–4
–3
–2
–1
0
1
2
3
4
5
6
ZERO ERROR, FULL-SCALE ERROR (LSB)
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
Figure 20. Zero Error, Full-Scale Error without Reference vs. Temperature
03034-0-021
2.4994
2.4996
2.4998
2.5000
2.5002
2.5004
2.5006
2.5008
2.5010
2.5012
2.5014
2.5016
–40 –20 0 20 40 60 80 100 120
T
E
M
P
E
R
A
T
U
R
E
(
°
C
)
VREF (V)
Figure 21.Typical Reference Voltage Output vs. Temperature (2 Units)
03034-0-039
0
5
10
15
20
25
NUMBER OF UNITS
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
REFERENCE DRIFT (ppm/°C)
7
.
5
8.0
Figure 22. Reference Voltage Temperature Coefficient Distribution (93 Units)