FN7386.6 July 7, 2009 determine if load conditions or package types need to be modified to assure operation of the amplifier in a safe operatin" />
參數(shù)資料
型號(hào): EL5156ISZ-T7
廠商: Intersil
文件頁數(shù): 3/17頁
文件大?。?/td> 0K
描述: IC AMP VFA 600MHZ SGL 8-SOIC
標(biāo)準(zhǔn)包裝: 1
放大器類型: 電壓反饋
電路數(shù): 1
轉(zhuǎn)換速率: 700 V/µs
增益帶寬積: 210MHz
-3db帶寬: 600MHz
電流 - 輸入偏壓: 400nA
電壓 - 輸入偏移: 500µV
電流 - 電源: 6mA
電流 - 輸出 / 通道: 140mA
電壓 - 電源,單路/雙路(±): 4.5 V ~ 12 V,±2.25 V ~ 6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: EL5156ISZ-T7DKR
11
FN7386.6
July 7, 2009
determine if load conditions or package types need to be
modified to assure operation of the amplifier in a safe
operating area.
The maximum power dissipation allowed in a package is
determined according to Equation 2:
Where:
TJMAX = Maximum junction temperature
TAMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
The maximum power dissipation actually produced by an IC
is the total quiescent supply current times the total power
supply voltage, plus the power in the IC due to the load, or:
For sourcing:
For sinking:
Where:
VS = Supply voltage
ISMAX = Maximum quiescent supply current
VOUT = Maximum output voltage of the application
RLOAD = Load resistance tied to ground
ILOAD = Load current
N = number of amplifiers (max = 2)
By setting the two PDMAX equations equal to each other, we
can solve the output current and RLOAD to avoid the device
overheat.
Power Supply Bypassing Printed Circuit Board
Layout
As with any high frequency device, a good printed circuit
board layout is necessary for optimum performance. Lead
lengths should be as short as possible. The power supply
pin must be well bypassed to reduce the risk of oscillation.
For normal single supply operation, where the VS- pin is
connected to the ground plane, a single 4.7F tantalum
capacitor in parallel with a 0.1F ceramic capacitor from VS+
to GND will suffice. This same capacitor combination should
be placed at each supply pin to ground if split supplies are to
be used. In this case, the VS- pin becomes the negative
supply rail. See Figure 37 for a complete tuned power supply
bypass methodology.
Printed Circuit Board Layout
For good AC performance, parasitic capacitance should be
kept to a minimum. Use of wire wound resistors should be
avoided because of their additional series inductance. Use
of sockets should also be avoided if possible. Sockets add
parasitic inductance and capacitance that can result in
compromised performance. Minimizing parasitic capacitance
at the amplifier's inverting input pin is very important. The
feedback resistor should be placed very close to the
inverting input pin. Strip line design techniques are
recommended for the signal traces.
PDMAX
TJMAX TAMAX
Θ
JA
---------------------------------------------
=
(EQ. 2)
PDMAX
VS ISMAX
VS VOUTi
()
i1
=
n
VOUTi
RLi
-----------------
×
+
×
=
(EQ. 3)
PDMAX
VS ISMAX
VOUTi VS
()
i1
=
n
ILOADi
×
+
×
=
(EQ. 4)
EL5156, EL5157, EL5256, EL5257
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