Datasheet

11
21421012fa
LTC2142-12/
LTC2141-12/LTC2140-12
LTC2141-12: 64k Point FFT,
f
IN
= 140MHz, –1dBFS, 40Msps
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2141-12: 64k Point FFT,
f
IN
= 30MHz, –1dBFS, 40Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
5 101520
21421012 G19
FREQUENCY (MHz
)
0
5
1
0
1
5
2
0
21421012
G
1
9
LTC2141-12: 64k Point FFT,
f
IN
= 70MHz, –1dBFS, 40Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
5 101520
21421012 G20
FREQUENCY (MHz
)
0
5
10
15
20
2
1421012
G
2
0
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
5 101520
21421012 G21
LTC2141-12: 64k Point 2-Tone
FFT, f
IN
= 69MHz, 70MHz,
–7dBFS, 40Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
5 101520
21421012 G22
FREQUENCY
(M
Hz)
0
5
10
1
5 2
0
21421012
G
2
2
OUTPUT CODE
2043 2044
2000
0
6000
4000
COUNT
8000
10000
18000
16000
14000
12000
2045 2046 2047
21421012 G23
LTC2141-12: Shorted Input
Histogram
INPUT FREQUENCY (MHz)
0
69
68
72
71
70
SNR (dBFS)
50 100 150 200 250 300
21421012 G24
SINGLE-ENDED
ENCODE
DIFFERENTIAL
ENCODE
LTC2141-12: SNR
vs Input Frequency, –1dBFS,
40Msps, 2V Range
0 50 100 150 200 250 300
INPUT FREQUENCY (MHz)
90
85
80
75
70
65
100
95
2ND AND 3RD HARMONIC (dBFS)
21421012 G25
2ND
3RD
LTC2141-12: 2nd, 3rd Harmonic
vs Input Frequency, –1dBFS,
40Msps, 2V Range
0 50 100 150 200 250 300
INPUT FREQUENCY (MHz)
90
85
80
75
70
65
100
95
2ND AND 3RD HARMONIC (dBFS)
21421012 G26
2ND
3RD
LTC2141-12: 2nd, 3rd Harmonic
vs Input Frequency, –1dBFS,
40Msps, 1V Range
LTC2141-12: SFDR vs Input Level,
f
IN
= 70MHz, 40Msps, 2V Range
INPUT LEVEL (dBFS)
–80
40
30
20
10
0
60
50
SFDR (dBc AND dBFS)
70
80
110
100
90
–70 –60 –50 –40 –30 –20 –10 0
21421012 G27
dBFS
dBc