Rainbow-electronics MAX1121 Manual de usuario Pagina 5
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MAX1121
1.8V, 8-Bit, 250Msps Analog-to-Digital Converter
with LVDS Outputs for Wideband Applications
_______________________________________________________________________________________ 5
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
FFT PLOT (8192-POINT DATA RECORD,
COHERENT SAMPLING)
MAX1121 toc01
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
040608020 100 140120
f
SAMPLE
= 250.0057MHz
f
IN
= 11.5054MHz
A
IN
= -0.4885MHz
SNR = 48.9dB
SFDR = 71.5dBc
HD2 = -79.2dBc
HD3 = -74.6dBc
HD2
HD3
-90
-80
-60
-70
-40
-50
-30
-10
-20
0
FFT PLOT (8192-POINT DATA RECORD,
COHERENT SAMPLING)
MAX1121 toc02
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
040608020 100 140120
f
SAMPLE
= 250.0057MHz
f
IN
= 60.0294MHz
A
IN
= -0.4885MHz
SNR = 49dB
SFDR = 71.1dBc
HD2 = -79.5dBc
HD3 = -71.9dBc
HD2
HD3
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
040608020 100 140120
FFT PLOT (8192-POINT DATA RECORD,
COHERENT SAMPLING)
MAX1121 toc03
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
f
SAMPLE
= 250.0057MHz
f
IN
= 183.5064MHz
A
IN
= -0.5245MHz
SNR = 48.8dB
SFDR = 69.1dBc
HD2 = -77.2dBc
HD3 = -69.1dBc
HD2
HD3
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
FFT PLOT (8192-POINT DATA RECORD,
COHERENT SAMPLING)
MAX1121 toc04
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
040608020 100 140120
HD3
HD2
f
SAMLE
= 250.0057MHz
f
IN
= 500.516MHz
A
IN
= -0.5235MHz
SNR = 48.8dB
SFDR = 63.8dBc
HD2 = -70.8dBc
HD3 = -63.8dBc
FUNDAMENTAL
SNR vs. ANALOG INPUT FREQUENCY
(f
SAMPLE
= 250.0057MHz, A
IN
= -0.5dBFS)
MAX1121 toc05
f
IN
(MHz)
SNR (dB)
400300200100
46
49
47
48
50
45
0500
SFDR vs. ANALOG INPUT FREQUENCY
(f
SAMPLE
= 250.0057MHz, A
IN
= -0.5dBFS)
MAX1121 toc06
f
IN
(MHz)
SFDR (dBc)
400300200100
62
56
68
74
80
50
0500
HD2/HD3 vs. ANALOG INPUT FREQUENCY
(f
SAMPLE
= 250.0057MHz, A
IN
= -0.5dBFS)
MAX1121 toc07
f
IN
(MHz)
HD2/HD3 (dBc)
400300200100
-90
-80
-70
-60
-50
-100
0500
HD3
HD2
20
30
25
40
35
45
50
-30 -15 -10-25 -20 -5 0
SNR vs. ANALOG INPUT AMPLITUDE
(f
SAMPLE
= 250.0057MHz, f
IN
= 60.0294MHz)
MAX1121 toc08
ANALOG INPUT AMPLITUDE (dBFS)
SNR (dB)
30
50
40
45
35
65
60
55
70
75
-30 -15 -10-25 -20 -5 0
SFDR vs. ANALOG INPUT AMPLITUDE
(f
SAMPLE
= 250.0057MHz, f
IN
= 60.0294MHz)
MAX1121 toc09
ANALOG INPUT AMPLITUDE (dBFS)
SFDR (dBc)
Typical Operating Characteristics
(AV
CC
= OV
CC
= 1.8V, AGND = OGND = 0, f
SAMPLE
= 250.0057MHz, -0.5dBFS; see TOCs for detailed information on test condi-
tions, differential input drive, differential sine-wave clock input drive, 0.1µF capacitor on REFIO, internal reference, digital output pins
differential R
L
= 100Ω, T
A
= +25°C.)
- General Description 1
- Applications 1
- Features 1
- Pin Configuration 1
- Ordering Information 1
- ABSOLUTE MAXIMUM RATINGS 2
- ELECTRICAL CHARACTERISTICS 2
- Pin Description 8
- Pin Description (continued) 9
- Detailed Description— 10
- Theory of Operation 10
- Clock Outputs (DCLKP, DCLKN) 11
- ORP/N) and Control Input 12
- System Timing Requirements 12
- Applications Information 13
- Layout Considerations 14
- Static Parameter Definitions 16
- Dynamic Parameter Definitions 16
- Pin-Compatible Higher 16
- Resolution Versions 16
- Package Information 17
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