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參數(shù)資料
型號: LT5554IUH#PBF
廠商: Linear Technology
文件頁數(shù): 8/32頁
文件大小: 0K
描述: IC VGA DIG CONTROL 32-QFN
標(biāo)準(zhǔn)包裝: 73
應(yīng)用: 可變增益(VGA)
電路數(shù): 1
-3db帶寬: 1GHz
電流 - 電源: 200mA
電壓 - 電源,單路/雙路(±): 4.75 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 32-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 32-QFN 裸露焊盤(5x5)
包裝: 管件
產(chǎn)品目錄頁面: 1322 (CN2011-ZH PDF)
LT5554
16
5554f
DEFINITION OF SPECIFICATIONS
Amplier Impedance and Gain Denitions
(Differential)
RS
Input source resistor. Input matching is assumed:
RS = RIN
RIN
LT5554 input resistance (internal, 50Ω)
CIN
LT5554 input capacitance (internal)
RO
LT5554 output resistance (internal, 400Ω)
CO
LT5554 output capacitance (internal)
RLOAD
Load resistance as seen by LT5554
output pins
CLOAD
Load capacitance as seen by LT5554
output pins
ROUT
Total output resistance at LT5554 open-collec-
tors outputs (used in GV, GP gain calculation):
ROUT = RO || RLOAD
COUT
Total output capacitance at LT5554 output
(used in gain calculation):
COUT = CLOAD + CO
GM
LT5554 differential transconductance:
G=
I
V
M
OUT
IN
GV
LT5554 differential voltage gain:
G
V
GR
V
OUT
IN
M
OUT
=
=
()
20
log
in dB
GP
LT5554 differential power gain:
GP = 10log(RIN GM2 ROUT) in dB
PIN
Power available at LT5554 input, RS = RIN =
50Ω input matching:
P
V
RmW
IN
=
()
10
2
1
2
log
in dBm
V is peak value
IN
,
-
POUT
Total power delivered by LT5554 open-collec-
tor outputs:
P
V
RmW
OUT
=
()
10
2
1
2
log
OUT
in dBm
V
is peak value
,
-
Figure 2. Output Equivalent Circuit and Impedance Denitions
INTERNAL
EXTERNAL
5554 F02
OUT+
OUT
CLOAD
CO
1.9pF
IDC
RO
400Ω
RO
400Ω
IOUT = GM VIN
ROUT
RLOAD
ROUT
RLOAD
VOUT = IOUT ROUT
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