
5
LTC1408
1408fa
SINAD, ENOBs vs Frequency
SFDR vs Input Frequency
VDD = 3V, TA = 25°C
THD, 2nd and 3rd
vs Input Frequency
TYPICAL PERFOR A CE CHARACTERISTICS
UW
98kHz Unipolar Sine Wave 4096
Point FFT Plot, 100 ksps
98kHz Bipolar Sine Wave 4096
Point FFT Plot, 100 ksps
SNR vs Input Frequency
THD, 2nd and 3rd
vs Input Frequency
FREQUENCY (MHz)
56
SINAD
(dB)
ENOBS
(bits)
59
62
65
68
71
74
77
1
10
100
1408 G01
53
9
9.5
10
10.5
11
11.5
12
12.5
8.5
0.1
UNIPOLAR SINGLE
ENDED
BIPOLAR
DIFFERENTIAL
FREQUENCY (MHz)
–98
THD
(dB)
–92
–74
–80
–86
–68
–62
–56
–50
–44
1
10
100
1408 G02
–104
0.1
5 HARMONIC THD
UNIPOLAR SINGLE ENDED
2nd
3rd
FREQUENCY (MHz)
–98
THD
(dB)
–92
–74
–80
–86
–68
–62
–56
–50
–44
1
10
100
1408 G03
–104
0.1
5 HARMONIC THD
BIPOLAR SINGLE ENDED
VCM = 1.5V
2nd
3rd
FREQUENCY (MHz)
50
SFDR
(dB)
56
74
68
62
80
86
92
98
104
1
10
100
1408 G04
44
0.1
UNIPOLAR SINGLE ENDED
BIPOLAR DIFFERENTIAL
FREQUENCY (MHz)
65
SNR
(dB)
66
69
68
67
70
71
72
75
74
73
76
1
10
100
1408 G05
64
0.1
UNIPOLAR
SINGLE ENDED
BIPOLAR
DIFFERENTIAL
FREQUENCY(kHz)
0
–120
OUTPUT
MAGNITUDE
(dB)
–80
–90
–100
–110
–40
–60
–70
–50
0
–10
–20
–30
10
30
20
1408 G06
40
50
FREQUENCY(kHz)
0
–120
OUTPUT
MAGNITUDE
(dB)
–80
–90
–100
–110
–40
–60
–70
–50
0
–10
–20
–30
10
30
20
1408 G07
40
50
591kHz Bipolar Differential Sine
Wave 4096 Point FFT Plot,
100 ksps
101kHz Unipolar Single Ended
Sine Wave 4096 Point FFT Plot,
625 ksps
FREQUENCY(kHz)
0
–120
OUTPUT
MAGNITUDE
(dB)
–80
–90
–100
–110
–40
–60
–70
–50
0
–10
–20
–30
10
30
20
1408 G08
40
50
FREQUENCY(kHz)
0
–120
OUTPUT
MAGNITUDE
(dB)
–80
–90
–100
–110
–40
–60
–70
–50
0
–10
–20
–30
62.5
188
125
1408 G09
250
313