Datasheet

LTC2258-14
LTC2257-14/LTC2256-14
12
225814fc
For more information www.linear.com/LTC2258-14For more information www.linear.com/LTC2258-14
Typical perForMance characTerisTics
LTC2257-14: 8k Point FFT,
f
IN
= 69MHz, –1dBFS, 40Msps
LTC2257-14: 8k Point FFT,
f
IN
= 139MHz, –1dBFS, 40Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
10
20
225814 G25
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
10
20
225814 G26
LTC2257-14: 8k Point 2-Tone FFT,
f
IN
= 68MHz, 69MHz, –1dBFS,
40Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
10
20
225814 G27
LTC2257-14: I
VDD
vs Sample Rate,
5MHz Sine Wave Input, –1dB
LTC2257-14: I
OVDD
vs Sample
Rate, 5MHz Sine Wave Input,
–1dB, 5pF on Each Data Output
LTC2257-14: Shorted Input
Histogram
LTC2257-14: SFDR vs Input Level,
f
IN
= 70MHz, 2V Range, 40Msps
OUTPUT CODE
8198
1000
0
3000
2000
COUNT
4000
5000
6000
8200
8202 8204 8206
225814 G28
SAMPLE RATE (Msps)
0
30
20
25
15
35
I
VDD
(mA)
20 40
225814 G33
LVDS OUTPUTS
CMOS OUTPUTS
SAMPLE RATE (Msps)
25
10
15
20
5
0
45
30
35
40
I
OVDD
(mA)
225814 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
225814 G32
dBFS
dBc
INPUT FREQUENCY (MHz)
0
72
71
70
69
68
67
66
74
73
SNR (dBFS)
50
100 150 200 250 300 350
225814 G29
INPUT FREQUENCY (MHz)
0
90
85
80
75
70
65
95
SFDR (dBFS)
50
100 150 200 250 300 350
225814 G30
LTC2257-14: SNR vs Input
Frequency, –1dB, 2V Range,
40Msps
LTC2257-14: SFDR vs Input
Frequency, –1dB, 2V Range,
40Msps