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REV. 0
AD5426/AD5432/AD5443
–9–
FREQUENCY (Hz)
I
D
3.5
0
100M
3.0
2.0
1.5
1.0
0.5
2.5
10M
1M
100k
10k
1k
100
10
1
T
= 25 C
AD5443
LOADING 010101010101
V
CC
= 5V
V
CC
= 3V
TPC 19. Supply Current vs.
Update Rate
–9.00
–6.00
–3.00
0.00
3.00
10k
100k
1M
10M
100M
FREQUENCY (Hz)
T
A
= 25 C
V
= 5V
AD8038 AMPLIFIER
V
REF
= 2V, AD8038 C
C
1.47pF
V
REF
= 2V, AD8038 C
C
1pF
V
REF
= 0.15V, AD8038 C
C
1pF
V
REF
= 0.15V, AD8038 C
C
1.47pF
V
REF
= 3.51V, AD8038 C
C
1.8pF
G
TPC 22. Reference Multiplying
Bandwidth vs. Frequency and
Compensation Capacitor
–120
–100
–80
–60
0
20
1
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
–40
–20
T
A
= 25 C
V
= 3V
AMP = AD8038
FULL SCALE
ZERO SCALE
P
TPC 25. Power Supply Rejection vs.
Frequency
–102
–66
–72
–78
–54
–60
–42
–48
–30
–36
–18
–24
–6
6
0
1
10
100
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
G
T
A
= 25 C
LOADING
ZS TO FS
–12
–84
–90
–96
T
A
= 25 C
V
= 5V
V
REF
= 3.5V
INPUT
C
= 1.8pF
AD8038 AMPLIFIER
ALL ON
DB11
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
ALL OFF
TPC 20. Reference Multiplying
Bandwidth vs. Frequency and Code
TIME (ns)
O
0.060
–0.020
0.050
0.020
0.010
0.000
–0.010
0.040
0.030
300
250
200
150
100
50
0
T
A
= 25 C
V
REF
= 0V
AD8038 AMP
C
COMP
= 1.8pF
AD5443
V
DD
3V, 0V REF
NRG = 0.088nVs
800H TO 7FFH
V
5V, 0V REF
NRG = 0.119nVs,
800H TO 7FFH
V
DD
3V, 0V REF
NRG = 1.877nVs
7FFH TO 800H
V
DD
5V, 0V REF
NRG = 2.049nVs
7FFH TO 800H
TPC 23. Midscale Transition
V
REF
= 0 V
–90
–85
–80
–65
–60
1
10
100
FREQUENCY (Hz)
1k
10k
100k
1M
–75
–70
T
A
= 25 C
V
DD
= 3V
V
REF
= 3.5V p-p
T
TPC 26. THD and Noise vs.
Frequency
–0.8
–0.6
–0.4
–0.2
0
0.2
1
10
100
1k
10k 100k 1M
100M
FREQUENCY (Hz)
T
A
= 25 C
V
DD
= 5V
V
REF
= 3.5V
C
= 1.8pF
AD8038 AMPLIFIER
10M
G
TPC 21. Reference Multiplying
Bandwidth—All Ones Loaded
TIME (ns)
O
–1.700
–1.760
300
–1.710
–1.720
–1.730
–1.740
–1.750
250
200
150
100
50
0
T
A
= 25 C
V
= 3.5V
AD8038 AMP
C
= 1.8pF
AD5443
V
DD
3V, 3.5V REF
NRG = 0.647nVs
800H TO 7FFH
V
5V, 3.5V REF, NRG = 0.364nVs,
800H TO 7FFH
V
3V, 3.5V REF
NRG = 1.433nVs
7FFH TO 800H
V
DD
5V, 3.5V REF
NRG = 1.184nVs
7FFH TO 800H
TPC 24. Midscale Transition
V
REF
= 3.5 V
TEMPERATURE ( C)
C
0.7
0
120
0.6
0.4
0.3
0.2
0.1
0.5
100
80
60
40
20
0
–20
–40
V
DD
= 5V
V
DD
= 3V
ALL 1s
ALL 0s
TPC 27. Supply Current
vs. Temperature
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