參數(shù)資料
型號(hào)： LT5554IUH#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 30/32頁(yè)
文件大?。?/td> 0K
描述： IC VGA DIG CONTROL 32-QFN
標(biāo)準(zhǔn)包裝： 2,500
應(yīng)用： 可變?cè)鲆妫╒GA）
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： 帶卷 (TR)
LT5554
7
5554f
FREQUENCY (MHz)
0
GAIN
(dB)
20
18
16
12
8
4
14
10
6
2
0
500
900
300
700
5554 G01
1000
400
800
200
600
100
Note 5: RTI (Referred-To-Input) stands for the total input-referred noise
voltage source. RTI is close to output noise voltage divided by voltage gain
(the exact equation is given in Denition of Specication section). The
equivalent noise source eN is twice the RTI value.
Note 6: The external loading at LT5554 OUT+/OUT– pins is RLOAD = 57Ω.
ROUT = RLOAD || RO = 50Ω.
Note 7: The IN+, IN–, DEC pins are internally biased. The time-constant
of input coupling capacitor sets the low frequency corner (LF) at input.
The output coupling capacitors or the transformer sets the low frequency
corner (LF) at the output. The LT5554 operates internally down to DC.
Note 8: The external loading at OUT+/OUT– pins is RLOAD = 133Ω.
ROUT = RLOAD || RO = 100Ω.
Note 9: Depending on the actual input matching conditions and frequency
of operation, the LT5554 steps involving the input attenuator tap change
may show less than 0.125dB change. These steps are GMAX –4dB, GMAX
–8dB, GMAX –12dB, and the code is given in the Programmable Gain Table.
The LT5554 monotonic operation for 0.125dB step resolution can still be
obtained by skipping any such code with a gain error excedding 0.125dB.
TYPICAL PERFORMANCE CHARACTERISTICS
Gain vs Frequency for
0.5dB Steps, Figure 17
Differential Gain Error vs
Frequency at –40°C
Differential Gain Error vs
Frequency at 85°C
ELECTRICAL CHARACTERISTICS
(ROUT = 50Ω) TA = 25°C. VCC = 5V, VCCO = 5V,
ENB = 3V, MODE = 5V, STROBE = 3V, VIH = 2.2V, VIL = 0.6V (Test circuit shown in Figure 16), unless otherwise noted.
FREQUENCY (MHz)
50
GAIN
ERROR
(dB)
0.3
0.2
0.1
0
–0.1
–0.2
5554 G02
200
125
175
100
150
75
12dB
4dB
8dB
FREQUENCY (MHz)
50
GAIN
ERROR
(dB)
0.3
0.2
0.1
0
–0.1
–0.2
5554 G03
200
125
175
100
150
75
12dB
4dB
8dB
Differential Gain Error vs
Attenuation at 50MHz
Differential Gain Error vs
Attenuation at 100MHz
Differential Gain Error vs
Attenuation at 200MHz
ATTENUATION (dB)
0
GAIN
ERROR
(dB)
0.3
0.2
0.1
0
–0.1
–0.2
5554 G04
–16
–4
–12
–8
–40°C
25°C
85°C
ATTENUATION (dB)
0
GAIN
ERROR
(dB)
0.3
0.2
0.1
0
–0.1
–0.2
5554 G05
–16
–4
–12
–8
–40°C
25°C
85°C
ATTENUATION (dB)
0
GAIN
ERROR
(dB)
0.3
0.2
0.1
0
–0.1
–0.2
5554 G06
–16
–4
–12
–8
–40°C
25°C
85°C
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