
7
LTC1747
1747fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Averaged 8192 Point 2-Tone FFT,
5.2MHz and 5.7MHz Inputs,
–7dB, 3.2V Range
SFDR vs 20MHz Input Level
SFDR vs 50MHz Input Level
SFDR vs 70MHz Input Level
SFDR vs Input Frequency and
Amplitude, 3.2V Range,
2nd or 3rd Harmonic
Shorted Input Histogram,
3.2V Range
FREQUENCY (MHz)
0
AMPLITUDE
(dBFS)
–60
–30
–20
40
1747 G16
–70
–80
–120
10
20
30
5
15
25
35
–100
0
–10
–40
–50
–90
–110
TA = 25°C
Averaged 8192 Point 2-Tone FFT,
25.2MHz and 30.2MHz Inputs,
–7dB, 3.2V Range
FREQUENCY (MHz)
0
AMPLITUDE
(dBFS)
–60
–30
–20
40
1747 G17
–70
–80
–120
10
20
30
5
15
25
35
–100
0
–10
–40
–50
–90
–110
TA = 25°C
Averaged 8192 Point 2-Tone FFT,
65.2MHz and 70.2MHz Inputs,
–7dB, 3.2V Range
FREQUENCY (MHz)
0
AMPLITUDE
(dBFS)
–60
–30
–20
40
1747 G18
–70
–80
–120
10
20
30
5
15
25
35
–100
0
–10
–40
–50
–90
–110
TA = 25°C
INPUT LEVEL (dBFS)
–80
SFDR
(dBc
AND
dBFS)
60
90
100
0
1747 G19
50
40
0
–60
–40
–20
–70
–50
–30
–10
20
120
110
dBFS
dBc
80
70
30
10
TA = 25°C
INPUT LEVEL (dBFS)
–80
SFDR
(dBc
AND
dBFS)
60
90
100
0
1747 G20
50
40
0
–60
–40
–20
–70
–50
–30
–10
20
120
110
dBFS
dBc
80
70
30
10
TA = 25°C
INPUT LEVEL (dBFS)
–80
SFDR
(dBc
AND
dBFS)
60
90
100
0
1747 G21
50
40
0
–60
–40
–20
–70
–50
–30
–10
20
120
110
dBFS
dBc
80
70
30
10
TA = 25°C
INPUT FREQUENCY (MHz)
0
SFDR
(dBFS)
75
80
85
60
100
1748 G26
70
65
60
20
40
80
90
95
100
–20dB
–10dB
–6dB
–1dB
TA = 25°C
SFDR vs Input Frequency and
Amplitude, 2V Range,
2nd or 3rd Harmonic
INPUT FREQUENCY (MHz)
0
SFDR
(dBFS)
75
80
85
60
100
1747 G23
70
65
60
20
40
80
90
95
100
–20dB
–10dB
–6dB
–1dB
TA = 25°C
CODE
2035
03
0
COUNT
500
1500
2000
2500
2037
3985
2039
0
4500
1747 G24
1000
2036
2038
108
3000
3500
4000