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Maxim MAX5865 Bedienungsanleitung Seite 8

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Seitenansicht 7
MAX5865
Ultra-Low-Power, High-Dynamic-
Performance, 40Msps Analog Front End
8 _______________________________________________________________________________________
-80
-75
-70
-65
-60
-55
-50
-45
-40
0 25 50 75 100 125
ADC TOTAL HARMONIC DISTORTION
vs. ANALOG INPUT FREQUENCY
MAX5865 toc07
ANALOG INPUT FREQUENCY (MHz)
THD (dB)
50
55
60
65
70
75
80
0 25 50 75 100 125
ADC SPURIOUS-FREE DYNAMIC RANGE
vs. ANALOG INPUT FREQUENCY
MAX5865 toc08
ANALOG INPUT FREQUENCY (MHz)
SFDR (dBc)
40
45
50
55
65
50
75
70
80
0 25 50 75 100 125
ADC SPURIOUS-FREE DYNAMIC RANGE
vs. ANALOG INPUT FREQUENCY
MAX5865 toc09
ANALOG INPUT FREQUENCY (MHz)
SFDR (dBc)
SINGLE-ENDED
0
10
20
IA
QA
30
50
40
60
-24 -20 -16 -12 -8 -4 0
ADC SIGNAL-TO-NOISE RATIO
vs. ANALOG INPUT POWER
MAX5865 toc10
ANALOG INPUT POWER (dBFS)
SNR (dB)
f
IN
= 10.0732MHz
0
10
20
30
50
40
60
-24 -20 -16 -12 -8 -4 0
ADC SIGNAL-TO-NOISE AND DISTORTION RATIO
vs. ANALOG INPUT POWER
MAX5865 toc11
ANALOG INPUT POWER (dBFS)
SINAD (dB)
f
IN
= 10.0732MHz
-80
-75
-70
-65
-35
-40
-45
-55
-60
-50
-30
-24 -20 -16 -12 -8 -4 0
ADC TOTAL HARMONIC DISTORTION
vs. ANALOG INPUT POWER
MAX5865 toc12
ANALOG INPUT POWER (dBFS)
THD (dB)
f
IN
= 10.0732MHz
Typical Operating Characteristics (continued)
(V
DD
= DV
DD
= 3V, OV
DD
= 1.8V, internal reference (1.024V), C
L
≈ 10pF on all digital outputs, f
CLK
= 40MHz 50% duty cycle, ADC
input amplitude = -0.5dBFS, DAC output amplitude = 0dBFS, differential ADC input, differential DAC output, C
REFP
= C
REFN
=
C
COM
= 0.33µF, Xcvr mode, T
A
= +25°C, unless otherwise noted.)
-110
-70
-90
-30
-50
-10
-80
-100
-40
-60
-20
0
048121620
ADC CHANNEL-QA TWO-TONE FFT PLOT
MAX5865 toc04
FREQUENCY (MHz)
AMPLITUDE (dBFS)
f
CLK
= 40MHz
f
1
= 1.8MHz
f
2
= 2.2MHz
A
IA
= -7dBFS PER TONE
8192-POINT DATA RECORD
f
2
f
1
46.0
46.5
47.0
47.5
48.0
48.5
IA
QA
49.0
49.5
50.0
0 25 50 75 100 125
ADC SIGNAL-TO-NOISE RATIO
vs. ANALOG INPUT FREQUENCY
MAX5865 toc05
ANALOG INPUT FREQUENCY (MHz)
SNR (dB)
46.0
46.5
47.0
47.5
48.0
48.5
IA
QA
49.0
49.5
50.0
0 25 50 75 100 125
ADC SIGNAL-TO-NOISE AND DISTORTION RATIO
vs. ANALOG INPUT FREQUENCY
MAX5865 toc06
ANALOG INPUT FREQUENCY (MHz)
SINAD (dB)
Seitenansicht 7
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