Datasheet

5
LTC1666/LTC1667/LTC1668
FREQUENCY (MHz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
SIGNAL AMPLITUDE (dBFS)
1666/7/8 G01
05
10
15 20 25
SFDR = 87dB
f
CLOCK
= 50MSPS
f
OUT
= 1.002MHz
AMPL = 0dBFS
= –8.25dBm
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Single Tone SFDR at 50MSPS 2-Tone SFDR
FREQUENCY (MHz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
SIGNAL AMPLITUDE (dBFS)
1666/7/8 G02
4.5 5.0 5.5
SFDR > 86dB
f
CLOCK
= 50MSPS
f
OUT1
= 4.9MHz
f
OUT2
= 5.09MHz
AMPL = 0dBFS
4-Tone SFDR, f
CLOCK
= 50MSPS
4-Tone SFDR, f
CLOCK
= 5MSPS
SFDR vs f
OUT
and Digital Amplitude
(dBFS) at f
CLOCK
= 5MSPS
SFDR vs f
OUT
and f
CLOCK
FREQUENCY (MHz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
SIGNAL AMPLITUDE (dBFS)
1666/7/8 G03
1 4.6 8.2 11.8 15.4 19
SFDR > 74dB
f
CLOCK
= 50MSPS
f
OUT1
= 5.02MHz
f
OUT2
= 6.51MHz
f
OUT3
= 11.02MHz
f
OUT4
= 12.51MHz
AMPL = 0dBFS
FREQUENCY (MHz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
SIGNAL AMPLITUDE (dBFS)
1666/7/8 G04
0.1 0.46 0.82 1.18 1.54 1.9
SFDR > 82dB
f
CLOCK
= 5MSPS
f
OUT1
= 0.5MHz
f
OUT2
= 0.65MHz
f
OUT3
= 1.10MHz
f
OUT4
= 1.25MHz
AMPL = 0dBFS
f
OUT
(MHz)
0.1
SFDR (dB)
100
90
80
70
60
50
1.0 10 100
1666/7/8 G05
5MSPS
25MSPS
50MSPS
DIGITAL AMPLITUDE = 0dBFS
f
OUT
(MHz)
100
95
90
85
80
75
70
65
60
55
50
SFDR (dB)
1666/7/8 G06
0 0.4
0.8
1.2 1.6 2.0
–12dBFS
–6dBFS
0dBFS
(LTC1668)
f
OUT
(MHz)
0
SFDR (dB)
4
8
10
95
90
85
80
75
70
65
60
55
50
1666/7/8 G07
26
–12dBFS
–6dBFS
0dBFS
f
OUT
(MHz)
0
SFDR (dB)
10
20
90
85
80
75
70
65
60
55
50
1666/7/8 G08
515
–12dBFS
–6dBFS
0dBFS
f
OUT
(MHz)
0
SFDR (dB)
10
95
90
85
80
75
70
65
60
55
50
1666/7/8 G09
2.5 5 7.5
DIGITAL AMPLITUDE = 0dBFS
I
OUTFS
= 2.5mA
I
OUTFS
= 5mA
I
OUTFS
= 10mA
SFDR vs f
OUT
and Digital Amplitude
(dBFS) at f
CLOCK
= 25MSPS
SFDR vs f
OUT
and Digital Amplitude
(dBFS) at f
CLOCK
= 50MSPS
SFDR vs f
OUT
and I
OUTFS
at
f
CLOCK
= 25MSPS