
120
110
100
90
80
70
60
50
40
30
20
10
0
10.5
21
31.5
Frequency (MHz)
Amplitude
(dBFS)
fIN = 10MHz
SNR = 71.8dBFS
SINAD = 71.8dBFS
SFDR = 85.6dBc
THD = 85.25dBc
G030
68
69
70
71
50
100
150
200
Frequency (MHz)
SNR
(dBFS)
G031
66
70
74
78
82
86
90
50
100
150
200
Frequency (MHz)
SFDR
(dBc)
G032
66
67
68
69
70
71
72
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Digital Gain (dB)
SINAD
(dBFS)
fIN = 70MHz
fIN = 140MHz
G033
SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
All plots are at 25°C, AVDD18_ADC=1.8V, DVDD18_CLK=1.8V, DVDD18=1.8V, DVDD18_DAC=1.8V, AVDD3_DAC=3.0V,
AVDD3_AUX=3.0V, maximum rated clock frequency, sine wave input clock. 1.5 VPP differential clock amplitude, 50% clock
duty cycle, –1 dBFS differential analog input, 0 dB gain, LVDS output interface for AFE7225, 32k point FFT (unless otherwise
noted)
AMPLITUDE
SNR
vs
FREQUENCY
INPUT FREQUENCY
Figure 7-5. Spectrum With Decimation Filter ON
Figure 7-6. SNR vs Input Frequency
SFDR
SINAD
vs
INPUT FREQUENCY
GAIN
Figure 7-7. SFDR vs Input Frequency
Figure 7-8. SINAD Across Gain
Copyright 2011–2012, Texas Instruments Incorporated
TYPICAL CHARACTERISTICS FOR AFE7225
63