Datasheet

AD7991/AD7995/AD7999
Rev. B | Page 14 of 28
DNL ERROR (LSB)
CODE
0 500 1000 1500 2000 2500 3000 3500 4000
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
0
6461-014
V
DD
= 5V
V
REF
= 2.5V
f
SCL
= 1.7MHz
Figure 10. DNL Error, V
DD
= 5 V, V
REF
= 2.5 V, f
SCL
= 1.7 MHz
Without Clock Stretching
800
0
26
V
DD
(V)
I
DD
(μA)
345
f
SCL
= 1.7MHz
+125°C
+85°C
+25°C
–40°C
600
400
200
06461-035
Figure 11. I
DD
Supply Current vs. Supply Voltage, f
SCL
= 1.7 MHz
Without Clock Stretching, −40°C to +125°C
1000
0
26
V
DD
(V)
I
DD
(μA)
800
600
400
200
345
f
SCL
= 3.4MHz
+125°C
+85°C
+25°C
–40°C
06461-034
Figure 12. I
DD
Supply Current vs. Supply Voltage, f
SCL
= 3.4 MHz
with Clock Stretching, −40°C to +125°C
–
70
–100
1 100
INPUT FREQUENCY (kHz)
THD (dB)
–80
–90
f
SCL
= 1.7MHz
06461-031
10
V
DD
= 5V
V
DD
= 3V
Figure 13. THD vs. Input Frequency, V
REF
= 2.5 V, f
SCL
= 1.7 MHz
Without Clock Stretching
CHANNEL-TO-CHANNEL ISOL
A
TION (dB)
f
NOISE
(kHz)
V
DD
= 3V
V
DD
= 5V
V
REF
= V
DD
f
SCL
= 1.7MHz
TEMPERATURE = T
A
89
90
91
92
93
94
95
96
0102030405060708090100
0
6461-017
Figure 14. AD7991 Channel-to-Channel Isolation , f
SCL
= 1.7 MHz
Without Clock Stretching
–120
–100
–80
–60
–40
–20
0
0246810
SINAD (dB)
FREQUENCY (kHz)
06461-018
16384 POINT FFT
f
S
= 22.5kSPS
f
SCL
= 405kHz
f
IN
= 5.13kHz
SNR = 71.83dB
SINAD = 71.39dB
THD = –81.26dB
SFDR = –93.71dB
Figure 15. Dynamic Performance, f
SCL
= 405 kHz
Without Clock Stretching, V
DD
= 5 V, Full-Scale Input,
Seven-Term Blackman-Harris Window