Datasheet

7
LTC1744
1744f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Averaged, 8192 Point FFT, Input
Frequency = 51MHz, –20dB,
2V Range
Averaged, 8192 Point FFT, Input
Frequency = 70MHz, –1dB,
2V Range
FREQUENCY (MHz)
024681012141618202224
25.37
AMPLITUDE (dBFS)
1744 G20
0.5
–10.0
–20.0
–30.0
–40.0
–50.0
–60.0
–70.0
–80.0
–90.0
–100.0
–110.0
–120.0
T
A
= 25°C
T
A
= 25°C
FREQUENCY (MHz)
024681012141618202224
25.37
AMPLITUDE (dBFS)
1744 G21
0.5
–10.0
–20.0
–30.0
–40.0
–50.0
–60.0
–70.0
–80.0
–90.0
–100.0
–110.0
–120.0
Averaged, 8192 Point FFT, Input
Frequency = 70MHz, –6dB,
2V Range
Averaged, 8192 Point FFT, Input
Frequency = 70MHz, –20dB,
2V Range
SNR vs Sample Rate, Input
Frequency = 5MHz, –1dB
T
A
= 25°C
FREQUENCY (MHz)
024681012141618202224
25.37
AMPLITUDE (dBFS)
1744 G22
0.5
–10.0
–20.0
–30.0
–40.0
–50.0
–60.0
–70.0
–80.0
–90.0
–100.0
–110.0
–120.0
T
A
= 25°C
FREQUENCY (MHz)
024681012141618202224
25.37
AMPLITUDE (dBFS)
1744 G23
0.5
–10.0
–20.0
–30.0
–40.0
–50.0
–60.0
–70.0
–80.0
–90.0
–100.0
–110.0
–120.0
SAMPLE RATE (Msps)
020
40 60 80 100
SNR (dBFS)
1744 G24
78
77
76
75
74
73
72
71
70
69
68
2V RANGE
3.2V RANGE
T
A
= 25°C
SFDR vs Sample Rate, Input
Frequency = 5MHz, –1dB
SAMPLE RATE (Msps)
020
40 60 80 100
SFDR (dBc)
1744 G25
100
95
90
85
80
75
70
65
60
55
50
2V RANGE
3.2V RANGE
T
A
= 25°C
(Note 5)
Grounded Input Histogram
CODE
8152 8153 8154 8155 8156 8157 8158
COUNT
1744 G09
40000
35000
30000
25000
20000
15000
10000
5000
0
T
A
= 25°C
SNR vs Input Frequency and
Amplitude, 3.2V Range
INPUT FREQUENCY (MHz)
1
SNR (dBc)
80
75
70
65
60
55
50
10 100
1744 G31
–1dBFS
–6dBFS
–20dBFS
T
A
= 25°C
INPUT FREQUENCY (MHz)
1
SNR (dBc)
75
70
65
60
55
50
10 100
1744 G30
–1dBFS
–6dBFS
–20dBFS
T
A
= 25°C
T
A
= 25°C
SNR vs Input Frequency and
Amplitude, 2V Range