AD7911/AD7921
Rev. A | Page 14 of 28
1.0
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
0 4096358430722560204815361024512
04350-0-013
CODE
INL ERROR (LSB)
V
DD
= 2.7V
F
SAMP
= 250kSPS
TEMPERATURE = 25°C
Figure 14. AD7921 INL Performance
1.0
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
0 4096358430722560204815361024512
04350-0-014
CODE
DNL ERROR (LSB)
V
DD
= 2.7V
F
SAMP
= 250kSPS
TEMPERATURE = 25°C
Figure 15. AD7921 DNL Performance
–95
–85
–75
–65
–55
–35
–25
–45
10 100 1k
04350-0-015
FREQUENCY (kHz)
THD (dB)
R
IN
= 1k
Ω
R
IN
= 500
Ω
R
IN
= 100
Ω
R
IN
= 50
Ω
R
IN
= 10
Ω
R
IN
= 0
Ω
V
DD
= 3.6V
Figure 16. THD vs. Analog Input Frequency for Various Source Impedances
–74
–76
–78
–80
–82
–84
–86
–88
10 100 1k
04350-0-016
FREQUENCY (kHz)
THD (dB)
V
DD
= 2.35V
V
DD
= 3.6V
V
DD
= 5.25V
V
DD
= 4.75V
V
DD
= 2.7V
Figure 17. THD vs. Analog Input Frequency for Various Supply Voltages
180
160
0
20
40
60
80
100
120
140
2.0 5.55.04.54.03.53.02.5
04350-0-017
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (nA)
TEMPERATURE = +25°C
TEMPERATURE = +85°C
TEMPERATURE = –40°C
Figure 18. Shutdown Current vs. Supply Voltage
