Datasheet

9
21576512f
LTC2157-12/
LTC2156-12/LTC2155-12
LTC2157-12:
Shorted Input Histogram
LTC2157-12: I
OVDD
vs Sample Rate,
15MHz Sine Wave Input, –1dBFS
LTC2157-12: SNR vs Input Level,
f
IN
= 70MHz, 1.5V Range, 250Msps
LTC2157-12: SFDR vs Input
Frequency, –1dBFS, 1.5V Range,
250Msps
LTC2157-12: I
VDD
vs Sample Rate,
15MHz Sine Wave Input, –1dBFS
LTC2157-12: SFDR vs Input Level,
f
IN
= 70MHz, 1.5V Range, 250Msps
LTC2157-12: 32K Point FFT,
f
IN
= 567MHz, –1dBFS, 250Msps
LTC2157-12: 32K Point FFT,
f
IN
= 907MHz, –1dBFS, 250Msps
LTC2157-12: 32K Point 2-Tone
FFT, f
IN
= 71.0MHz and 69.0MHz,
250Msps
TYPICAL PERFORMANCE CHARACTERISTICS
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20
40 60 80
21576512 G10
100 120
–20
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20
40 60 80
21576512 G11
100 120
–20
OUTPUT CODE
2048
COUNT
12000
16000
20000
21576512 G12
8000
4000
10000
14000
18000
6000
2000
0
2052
2056
SAMPLE RATE (Msps)
0
I
OVDD
(mA)
60
70
80
200
21576512 G13
50
40
30
50
100
150
250
LVDS CURRENT 3.5mA
LVDS CURRENT 1.75mA
SAMPLE RATE (Msps)
0
I
VDD
(mA)
260
280
300
200
21576512 G14
240
220
200
50
100
150
250
AMPLITUDE (dBFS)
–90
0
SFDR (dBFS)
40
20
80
100
120
–70
–50
–40 0
21576512 G15
60
–80 –60
–30
–20
–10
dBFS
dBc
AMPLITUDE (dBFS)
0
SNR (dBFS)
10
50
40
60
70
–50
–30
0
21576512 G16
30
20
dBFS
dBc
–60 –40
–20
–10
INPUT FREQUENCY (MHz)
0
SFDR (dBFS)
50
40
60
70
800
21576512 G17
20
30
10
0
200
400
500
1000
90
80
600
100
300
900
700
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20
40 60 80
21576512 G27
100 120
–20