Datasheet

11
21454312fa
LTC2145-12/
LTC2144-12/LTC2143-12
LTC2144-12: 64k Point FFT,
f
IN
= 140MHz, –1dBFS, 105Msps
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2144-12: 64k Point FFT,
f
IN
= 30MHz, –1dBFS, 105Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
10 20 30 40 50
21454312 G19
FREQUENCY
(
M
Hz)
0
10
20
30
40
50
214
5
4312
G19
LTC2144-12: 64k Point FFT,
f
IN
= 70MHz, –1dBFS, 105Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
10 20 30 40 50
21454312 G20
FREQUENCY (MHz
)
0
10
20
30
40
50
21454312 G2
0
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
10 20 30 40 50
21454312 G21
FREQUENCY
(
MHz
)
0
10
20
30
40
50
214
5
4312
G2
1
LTC2144-12: 64k Point 2-Tone
FFT, f
IN
= 69MHz, 70MHz,
–7dBFS, 105Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
10 20 30 40 50
21454312 G22
FREQUENCY
(
M
Hz)
0
10
20
30
40
50
21454312
G22
OUTPUT CODE
2043 2044
2000
0
6000
4000
COUNT
8000
10000
18000
16000
14000
12000
2045 2046 2047
21454312 G23
LTC2144-12: Shorted Input
Histogram
INPUT FREQUENCY (MHz)
0
69
68
72
71
70
SNR (dBFS)
50 100 150 200 250 300
21454312 G24
SINGLE-ENDED
ENCODE
DIFFERENTIAL
ENCODE
LTC2144-12: SNR vs Input
Frequency, –1dBFS, 105Msps,
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)
21454312 G25
2ND
3RD
LTC2144-12: 2nd, 3rd Harmonic
vs Input Frequency, –1dBFS,
105Msps, 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)
21454312 G26
2ND
3RD
LTC2144-12: 2nd, 3rd Harmonic
vs Input Frequency, –1dBFS,
105Msps, 1V Range
LTC2144-12: SFDR vs Input Level,
f
IN
= 70MHz, 105Msps, 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
21454312 G27
dBFS
dBc