參數(shù)資料
型號(hào)： LT5554IUH#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 5/32頁(yè)
文件大?。?/td> 0K
描述： IC VGA DIG CONTROL 32-QFN
標(biāo)準(zhǔn)包裝： 73
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： 管件
產(chǎn)品目錄頁(yè)面： 1322 (CN2011-ZH PDF)
LT5554
13
5554f
PIN FUNCTIONS
GND (Pins 1, 2, 7, 8, 10, 13, 15, 16, 19, 22, 25, 26, 28,
31): Ground Pins.
DEC (Pins 3, 6): Decoupling Pin for the Internal DC Bias
Voltage for the Differential Inputs, IN+ and IN–. It is also
connected to the ‘virtual ground’ of the input resistive
attenuator. Capacitive de-coupling to ground is recom-
mended in order to preserve linearity performance when
IN+, IN– inputs are driven with up to 3dB imbalance.
IN+ (Pin 4):
Positive Signal Input Pin with Internal DC
Bias to 2V.
IN– (Pin 5):
Negative Signal Input Pin with Internal DC
Bias to 2V.
PG5 (Pin 9): 4dB Step Amplier Programmable Gain Con-
trol Input Pin. Input levels are controlled by MODE pin.
PG6 (Pin 11): 8dB Step Amplier Programmable Gain
Control Input Pin. Input levels are controlled by the
MODE pin.
PG0 (Pin 12): 0.125dB Step Amplier Programmable
Gain Control Input Pin. Input levels are controlled by
MODE pin.
STROBE (Pin 14): Strobe Pin for the Programmable Gain
Control Inputs (PGx). With STROBE in Low-state, the
Amplier Gain is not changed by PGx state changes (latch
mode). With STROBE in High-state, the Amplier Gain is
asynchronously set by PGx inputs transitions (transpar-
ent-mode). A positive STROBE transition updates the
PGx state. Low-state and High-state depends on MODE
pin level (Table1).
VCC (Pins 17, 24): Power Supply Pins. These pins are
internally connected together.
MODE (Pin 18): PGx and STROBE Functionality and Level
Control Pin. When MODE is higher than VCC – 0.4V, the
PGx and STROBE are DC-coupled. When the MODE pin
is lower than 0.6V, the PGx and STROBE are AC-coupled.
2dB-Step Response (PG4)
120MHz Signal
8dB-Step Response (PG6)
120MHz Signal
8dB-Step Response (PG6)
120MHz Pulse Signal
TYPICAL PERFORMANCE CHARACTERISTICS (R
OUT = 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), maximum gain, unless otherwise noted.
8dB-Step (PG6) 120MHz Pulse
Signal for 8dB Overdrive
8dB-Step (PG6) 120MHz
Sinusoidal Signal for 2dB
Overdrive
8dB-Step (PG6) 120MHz
Sinusoidal Signal for 8dB
Overdrive
MODE = HIGH
1V/DIV
5554 G49
5ns/DIV
MODE = HIGH
1V/DIV
5554 G50
5ns/DIV
MODE = HIGH
1V/DIV
5554 G51
10ns/DIV
MODE = HIGH
0.1V/DIV
5554 G46
10ns/DIV
MODE = HIGH
0.1V/DIV
5554 G47
10ns/DIV
MODE = HIGH
0.2V/DIV
5554 G48
5ns/DIV
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參數(shù)描述
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