參數(shù)資料
型號(hào)： LT1228CS8#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 6/22頁(yè)
文件大?。?/td> 0K
描述： IC CURRNT FEEDBK AMP 100MHZ8SOIC
標(biāo)準(zhǔn)包裝： 100
放大器類型： 電流反饋
電路數(shù)： 1
轉(zhuǎn)換速率： 3500 V/µs
-3db帶寬： 100MHz
電流 - 輸入偏壓： 10µA
電壓 - 輸入偏移： 3000µV
電流 - 電源： 6mA
電流 - 輸出 / 通道： 125mA
電壓 - 電源，單路/雙路(±)： 4 V ~ 36 V，±2 V ~ 18 V
工作溫度： 0°C ~ 70°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-SO
包裝： 管件
產(chǎn)品目錄頁(yè)面： 1318 (CN2011-ZH PDF)
LT1228
14
1228fd
Power Supplies
The LT1228 amplifiers will operate from single or split
supplies from ±2V (4V total) to ±18V (36V total). It is
not necessary to use equal value split supplies, however
the offset voltage and inverting input bias current of the
current feedback amplifier will degrade. The offset voltage
changes about 350V/V of supply mismatch, the inverting
bias current changes about 2.5A/V of supply mismatch.
Power Dissipation
The worst case amplifier power dissipation is the total of
the quiescent current times the total power supply voltage
plus the power in the IC due to the load. The quiescent
supplycurrentoftheLT1228transconductanceamplifieris
equal to 3.5 times the set current at all temperatures. The
quiescent supply current of the LT1228 current feedback
amplifier has a strong negative temperature coefficient
and at 150°C is less than 7mA, typically only 4.5mA. The
power in the IC due to the load is a function of the output
voltage, the supply voltage and load resistance. The worst
case occurs when the output voltage is at half supply, if
it can go that far, or its maximum value if it cannot reach
half supply.
APPLICATIONS INFORMATION
TYPICAL APPLICATIONS
For example, let’s calculate the worst case power dis-
sipation in a variable gain video cable driver operating on
±12V supplies that delivers a maximum of 2V into 150.
The maximum set current is 1mA.
PD = 2VS ISMAX + 3.5ISET
(
)+ VS – VOMAX
(
)
VOMAX
RL
PD = 2 12V 7mA + 3.5 1mA
(
)
+ 12V – 2V
(
)
2V
150
= 0.252 + 0.133 = 0.385W
The total power dissipation times the thermal resistance
of the package gives the temperature rise of the die above
ambient. The above example in SO-8 surface mount pack-
age (thermal resistance is 150°C/W) gives:
Temperature Rise = PDθJA = 0.385W 150°C/W
= 57.75°C
Therefore the maximum junction temperature is 70°C
+57.75°C or 127.75°C, well under the absolute maximum
junction temperature for plastic packages of 150°C.
Basic Gain Control
The basic gain controlled amplifier is shown on the front
page of the data sheet. The gain is directly proportional
to the set current. The signal passes through three stages
from the input to the output.
First the input signal is attenuated to match the dynamic
range of the transconductance amplifier. The attenuator
should reduce the signal down to less than 100mV peak.
The characteristic curves can be used to estimate how
much distortion there will be at maximum input signal.
For single ended inputs eliminate R2A or R3A.
The signal is then amplified by the transconductance
amplifier (gm) and referred to ground. The voltage gain
of the transconductance amplifier is:
gm R1 = 10 ISET R1
Lastly the signal is buffered and amplified by the current
feedback amplifier (CFA). The voltage gain of the current
feedback amplifier is:
1
+
RF
RG
The overall gain of the gain controlled amplifier is the
product of all three stages:
AV =
R3
+R3A
10 ISET R1 1+
RF
RG
More than one output can be summed into R1 because
the output of the transconductance amplifier is a current.
This is the simplest way to make a video mixer.
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