Datasheet

13
21421012fa
LTC2142-12/
LTC2141-12/LTC2140-12
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2140-12: Shorted Input
Histogram
LTC2140-12: 64k Point 2-Tone FFT,
f
IN
= 69MHz, 70MHz,
–7dBFS, 25Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
510
21421012 G37
F
REQUENCY
(
MHz
)
0
5
10
21421
0
12
G
3
7
OUTPUT CODE
2050 2051 2053
2000
0
6000
4000
COUNT
8000
10000
18000
16000
14000
12000
2052 2054
21421012 G38
INPUT FREQUENCY (MHz)
0
69
68
72
71
70
SNR (dBFS)
50 100 150 200 250 300
21421012 G39
SINGLE-ENDED
ENCODE
DIFFERENTIAL
ENCODE
LTC2140-12: SNR vs Input
Frequency, –1dBFS, 25Msps,
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 G40
2ND
3RD
LTC2140-12: 2nd, 3rd Harmonic
vs Input Frequency, –1dBFS,
25Msps, 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 G41
2ND
3RD
LTC2140-12: 2nd, 3rd Harmonic
vs Input Frequency, –1dBFS,
25Msps, 1V Range
LTC2140-12: SFDR vs Input Level,
f
IN
= 70MHz, 25Msps, 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 G42
dBFS
dBc
LTC2140-12: I
VDD
vs Sample
Rate, 5MHz, –1dBFS Sine Wave
Input on Each Channel
SAMPLE RATE (Msps)
0
28
22
24
26
20
30
I
VDD
(mA)
5 10152025
21421012 G43
CMOS OUTPUTS
LVDS OUTPUTS
LTC2140-12: IO
VDD
vs Sample
Rate, 5MHz, –1dBFS, Sine Wave
on Each Input
LTC2140-12: SNR vs SENSE,
f
IN
= 5MHz, –1dBFS
SAMPLE RATE (Msps)
10
20
0
60
50
30
40
IO
VDD
(mA)
21421012 G44
0 5 10 15 20 25
3.5mA LVDS
1.75mA LVDS
1.8V CMOS
SENSE PIN (V)
0.6
67
66
68
69
72
71
70
SNR (dBFS)
0.7 0.8 0.9 1.1 1.2 1.31
21421012 G45