
LTC2258-12
LTC2257-12/LTC2256-12
12
225812fd
LTC2257-12: 8k Point FFT,
fIN = 69MHz, –1dBFS, 40Msps
LTC2257-12: 8k Point FFT,
fIN = 139MHz, –1dBFS, 40Msps
Typical perForMance characTerisTics
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE
(dBFS) –50
–30
–40
–20
–10
0
10
20
225812 G25
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE
(dBFS) –50
–30
–40
–20
–10
0
10
20
225812 G26
LTC2257-12: 8k Point 2-Tone FFT,
fIN = 68MHz, 69MHz, –1dBFS,
40Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE
(dBFS) –50
–30
–40
–20
–10
0
10
20
225812 G27
LTC2257-12: IVDD vs Sample Rate,
5MHz Sine Wave Input, –1dB
LTC2257-12: IOVDD vs Sample
Rate, 5MHz Sine Wave Input,
–1dB, 5pF on Each Data Output
LTC2257-12: Shorted Input
Histogram
LTC2257-12: SFDR vs Input Level,
fIN = 70MHz, 2V Range, 40Msps
OUTPUT CODE
2049
2000
0
6000
4000
COUNT 8000
16000
14000
12000
10000
18000
2051
2053
225812 G28
SAMPLE RATE (Msps)
0
25
30
35
20
I VDD
(mA)
20
40
225812 G33
LVDS OUTPUTS
CMOS OUTPUTS
SAMPLE RATE (Msps)
25
10
15
20
5
0
45
30
35
40
I OVDD
(mA)
225812 G34
1.75mA LVDS
1.8V CMOS
1.2V CMOS
3.5mA LVDS
0
20
40
INPUT LEVEL (dBFS)
–80
60
50
40
30
20
10
0
80
70
SFDR
(dBc
AND
dBFS)
90
100
110
–70 –60 –50 –40 –30 –20 –10
0
225812 G32
dBFS
dBc
INPUT FREQUENCY (MHz)
0
72
71
70
69
68
67
66
SNR
(dBFS)
50
100 150 200
250 300 350
225812 G29
INPUT FREQUENCY (MHz)
0
90
85
80
75
70
65
95
SFDR
(dBFS)
50
100 150 200
250 300 350
225812 G30
LTC2257-12: SNR vs Input
Frequency, –1dB, 2V Range,
40Msps
LTC2257-12: SFDR vs Input
Frequency, –1dB, 2V Range,
40Msps