
LTC2255/LTC2254
9
22554fa
LTC2254: IOVDD vs Sample Rate,
5MHz Sine Wave Input, –1dB,
OVDD = 1.8V
LTC2254: IVDD vs Sample Rate,
5MHz Sine Wave Input, –1dB
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LTC2254: SFDR vs Input Level,
fIN = 70MHz, 2V Range, 105Msps
LTC2254: SNR vs Input Level,
fIN = 70MHz, 2V Range, 105Msps
INPUT LEVEL (dBFS)
–70
SNR
(dBc
AND
dBFS)
70
–40
22554 G28
40
20
–60
–50
–30
10
0
80
dBFS
dBc
60
50
30
–20
–10
0
INPUT LEVEL (dBFS)
–80
SFDR
(dBc
AND
dBFS)
60
90
100
0
22554 G29
50
40
0
–60
–40
–20
–70
–50
–30
–10
20
110
dBFS
dBc
80
70
30
10
SAMPLE RATE (Msps)
0
I VDD
(mA)
80
75
90
95
100
105
80
22554 G30
85
40
20
100
60
120
110
115
120
2V RANGE
1V RANGE
SAMPLE RATE (Msps)
0
I OVDD
(mA)
1
3
4
5
7
22554 G31
2
6
40
120
100
20
60
80
LTC2254: SNR vs SENSE,
fIN = 5MHz, –1dB
SENSE PIN (V)
0.4
64
SNR
(dBFS)
65
67
68
69
74
71
0.6
0.8
0.9
22554 G33
66
72
73
70
0.5
0.7
1.0
1.1
LTC2254: SFDR vs Input Frequency,
–1dB, 2V Range, 105Msps
LTC2254: SNR and SFDR vs
Sample Rate, 2V Range,
fIN = 5MHz, –1dB
INPUT FREQUENCY (MHz)
0
85
90
100
150
250
22554 G26
80
75
50
100
200
300
350
70
65
95
SFDR
(dBRS)
SAMPLE RATE (Msps)
0
50
SNR
AND
SFDR
(dBFS)
60
70
80
90
20
40
60
80
22554 G27
100
120
140
SFDR
SNR