Datasheet

13
21454312fa
LTC2145-12/
LTC2144-12/LTC2143-12
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2143-12: Shorted Input
Histogram
LTC2143-12: 64k Point 2-Tone FFT,
f
IN
= 69MHz, 70MHz, –7dBFS,
80Msps
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
10 20 30 40
21454312 G37
FRE
Q
UEN
C
Y (M
Hz)
0
10
20
30
40
21454312
G37
OUTPUT CODE
2050 2051
2000
0
6000
4000
COUNT
8000
10000
18000
16000
14000
12000
2052 2053 2054
21454312 G38
INPUT FREQUENCY (MHz)
0
69
68
72
71
70
SNR (dBFS)
50 100 150 200 250 300
21454312 G39
SINGLE-ENDED
ENCODE
DIFFERENTIAL
ENCODE
LTC2143-12: SNR vs Input
Frequency, –1dBFS, 80Msps,
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 G40
2ND
3RD
LTC2143-12: 2nd, 3rd Harmonic vs
Input Frequency, –1dBFS, 80Msps,
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 G41
2ND
3RD
LTC2143-12: 2nd, 3rd Harmonic vs
Input Frequency, –1dBFS, 80Msps,
1V Range
LTC2143-12: SFDR vs Input Level,
f
IN
= 70MHz, 80Msps, 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 G42
dBFS
dBc
LTC2143-12: I
VDD
vs Sample
Rate, 5MHz, –1dBFS Sine Wave
Input on Each Input
SAMPLE RATE (Msps)
0
65
50
45
55
60
40
70
I
VDD
(mA)
20 40 60 80
21454312 G43
CMOS OUTPUTS
LVDS OUTPUTS
LTC2143-12: IO
VDD
vs Sample
Rate, 5MHz, –1dBFS, Sine Wave
on Each Channel
LTC2143-12: SNR vs SENSE,
f
IN
= 5MHz, –1dBFS
SAMPLE RATE (Msps)
10
20
0
60
50
30
40
IOV
DD
(mA)
21454312 G44
0 20406080
3.5mA LVDS
1.75mA LVDS
1.8V CMOS
1.2V 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
21454312 G45