ADC-207 Datel, Inc., ADC-207 Datasheet - Page 5

• Manufacturer Part Number: ADC-207
• Description: 20mhz, CMOS Flash ADC: 7-bit
• Manufacturer: Datel, Inc.

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.
OUTPUT
CODES
®
120
110
100
90
80
70
60
50
40
30
20
10
0
0
Figure 5. Beat Frequency Test at 20MHz
0.2
0.4
–10
–10
70
65
60
55
50
45
40
35
30
25
20
15
10
–5
70
65
60
55
50
45
40
35
30
25
20
15
10
–5
5
0
0
0.6
0
0
SAMPLE PULSE = 25ns
NUMBER OF SAMPLES (X10 )
®
0.8
SAMPLE PULSE WIDTH = 25ns
1
1
1
1.2
2
2
3
1.4
Figure 7. FFT Test Using the ADC-207
1.6
3
3
1.8
2
4
4
FREQUENCY (MHz)
69.2
69.2
5
5
OUTPUT
CODES
120
110
100
6
6
90
80
70
60
50
40
30
20
10
0
0
0.1
0.2
7
Figure 6. 10MHz Envelope Test
7
0.3
4MHz FUNDAMENTAL
0.4
4MHz FUNDAMENTAL
8
8
0.5
NUMBER OF SAMPLES(X10 )
27.3
27.3
0.6
0.7
9
9
0.8
0.9
3
10
1
10
1.1
ADC-207
1.2
1.3
1.4
1.5