Datasheet

Data Sheet AD5444/AD5446
Rev. E | Page 11 of 28
04588-057
10k 100k 1M 10M
100M
FREQUENCY
(Hz)
3
–9
0
GAIN (dB)
T
A
= 25°C
V
DD
= 5V
–6
–3
V
REF
=
±2
V,
AD8038 C
COMP
= 1pF
V
REF
=
±
2
V
,
AD8038 C
COMP
= 1.5pF
V
REF
=
±
15
V
,
AD8038 C
COMP
= 1pF
V
REF
=
±
15
V
,
AD8038 C
COMP
= 1.5pF
V
REF
=
±
15
V
, AD8038 C
COMP
= 1.8pF
Figure 24. Reference Multiplying Bandwidth vs. Frequency
and Compensation Capacitor
04588-058
50 200 225
250
TIME (ns)
0.08
–0.06
OUTPUT VOLTAGE (V)
–0.02
175100 125 15075
0.06
0.04
0.02
0
–0.04
T
A
= 25°C
V
REF
= 0V
AD8038 AMP
C
COMP
= 1.8pF
V
DD
= 5V
0x7FF TO 0x800
NRG = 2.154nV-s
V
DD
= 3V
0x7FF TO 0x800
NRG = 1.794nV-s
V
DD
= 5V
0x800 TO 0x7FF
NRG = 0.694nV-s
V
DD
= 5V
0x800 TO 0x7FF
NRG = 0.694nV-s
Figure 25. Midscale Transition, V
REF
= 0 V
50 200 225 250
TIME (ns)
–1.66
–1.80
OUTPUT VOLTAGE (V)
–1.76
175100 125 15075
–1.68
–1.70
–1.72
–1.74
–1.78
T
A
= 25°C
V
REF
= 3.5V
AD8038
AMP
C
COMP
= 1.8pF
V
DD
=
5V
0x7FF
TO 0x800
NRG = 2.154n
V
-s
V
DD
= 3V
0x7FF T
O 0x800
NRG = 1.794nV
-s
V
DD
= 5
V
0x800 T
O 0x7FF
NRG = 0.694nV-s
V
DD
= 5
V
0x800
TO 0x7FF
NRG = 0.694nV -s
04588-059
Figure 26. Midscale Transition, V
REF
= 3.5 V
04588-060
1 10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
10
–100
–90
–70
–50
–30
–10
PSRR (dB)
T
A
= 25°C
V
DD
= 3V
AD8038
AMPLIFIER
–80
–60
–40
–20
0
FUL
L SCALE
ZERO SCALE
Figure 27. Power Supply Rejection Ratio vs. Frequency
04588-061
THD + N (dB)
T
A
= 25°
C
V
DD
= 5V
V
REF
=
±3.5V
100 1k 10k 100k
FREQUENCY (Hz)
–60
–90
–85
–75
–65
–80
–70
Figure 28. THD + Noise vs. Frequency
04588-062
0 50
f
OUT
(kHz)
100
0
SFDR (dB)
40
20 30 4010
80
60
20
T
A
= 25°C
V
REF
= 3.5V
AD8038 AMP
MCLK = 500kHz
MCLK = 1MHz
MCLK = 200kHz
Figure 29. Wideband SFDR vs. f
OUT
Frequency