參數(shù)資料
型號: LT5554IUH#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PQCC32
封裝: 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32
文件頁數(shù): 14/32頁
文件大?。?/td> 607K
代理商: LT5554IUH#TRPBF
LT5554
21
5554f
Gain Step Accuracy
LT5554 internal input signal coupling to the transcon-
ductance amplier inputs across the 4dB step attenuator
increases with frequency. The gain step error is higher
when the LT5554 gain update changes the input attenua-
tor tap (PG5, PG6 transitions) and this error is frequency
dependent.
Gain error is ‘compressive’, effectively reducing LT5554
gain range. Therefore, it is possible to skip one gain
APPLICATIONS INFORMATION
code whenever PG5, PG6 transitions are involved in or-
der to preserve high-frequency monotonic behavior for
0.125dB steps.
Linearity and Noise Performance Throughout the
Gain Range
The LT5554’s Noise and Linearity performance across
the 16dB gain range at 100MHz with ROUT = 100 and
RSADC = 50Ω is shown in Figures 10 through 13.
ATTENUATION (dB)
0
R
TI
AND
V
ONOISE
(nV
/√
Hz
)
12
6
9
3
0
NF
(dB)
24
18
12
6
0
–4
–8
–12
5554 F10
–16
RTI
NF
VONOISE
Figure 10. Noise, 140MHz, ROUT = 50Ω
ATTENUATION (dB)
0
–4
–8
–12
5554 F12
–16
IMD3
(dBc)
–70
–74
–78
–82
–86
OIP3
(dBm)
48
46
44
42
40
OIP3
Figure 12. Linearity, 70MHz, ROUT = 50Ω, 4dBm/Tone
ATTENUATION (dB)
0
–4
–8
–12
5554 F11
–16
IIP3
(dBc)
44
34
39
29
24
SFDR
(dBm/Hz)
136
132
128
124
120
SFDR
IIP3
Figure 11. Noise, 140MHz, ROUT = 50Ω
ATTENUATION (dB)
0
–4
–8
–12
5554 F12
–16
IMD3
(dBc)
–70
–74
–78
–82
–86
OIP3
(dBm)
48
46
44
42
40
OIP3
Figure 13. Linearity, 140MHz, ROUT = 50Ω, 4dBm/Tone
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