ADC-207 Datasheet, PDF (5/6 Pages) List of Unclassifed Manufacturers – 7- BIT 20MHZ CMOS FLASH A/D CONVERTERS

®
®
ADC-207
120
110
100
90
80
OUTPUT ⁷⁰
CODES ₆₀
50
40
30
20
10
0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
NUMBER OF SAMPLES (X10³ )
Figure 5. Beat Frequency Test at 20MHz
120
110
100
90
80
OUTPUT ⁷⁰
CODES ₆₀
50
40
30
20
10
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5
NUMBER OF SAMPLES(X103 )
Figure 6. 10MHz Envelope Test
FFT TEST
This test actually produces an amplitude versus frequency graph (Figure 7) which indicates harmonic distortion and signal-to-noise
ratio. The theoretical rms signal-to-noise ration for a 7-bit converter is +43.8dB.
SAMSPALEMPPLUELSPUEL=S2E5WnsIDTH = 25ns
700
655
600
5555
5500
4455
4400
35
35
30
30
25
25
20
20
15
15
10
150
00
––55
––1100
00
11
22
33
6699.2.2
44
55
66
FREQUENCY (MHz)
4MHz4FMUHNzDFAUMNEDNATMAELNTAL
27.3
77
88
99
1100
Figure 7. FFT Test Using the ADC-207