參數(shù)資料
型號(hào)： LT1228IN8#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 音頻／視頻放大
英文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDIP8
封裝： 0.300 INCH, PLASTIC, DIP-8
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 401K
代理商： LT1228IN8#TR
18
LT1228
1228fc
Voltage Controlled State Variable Filter
TYPICAL APPLICATIO S
U
The state variable filter has both lowpass and bandpass
outputs. Each LT1228 is configured as a variable integra-
tor whose frequency is set by the attenuators, the capaci-
tors and the set current. Because the integrators have both
positive and negative inputs, the additional op amp nor-
mally required is not needed. The input attenuators set the
circuit up to handle 3VP–P signals.
The set current is generated with a simple circuit that gives
logarithmic voltage to current control. The two PNP tran-
sistors should be a matched pair in the same package for
best accuracy. If discrete transistors are used, the 51k
resistor should be trimmed to give proper frequency
response with VC equal zero. The circuit generates 100A
for VC equal zero volts and doubles the current for every
additional volt. The two 3k resistors divide the current
between the two LT1228s. Therefore the set current of
each amplifier goes from 50
A to 800A for a control
voltage of 0V to 4V. The resulting filter is at 100kHz for VC
equal zero, and changes it one octave/V of control input.
LT1228 TA18
–
+
–
+
gm
CFA
LOWPASS
OUTPUT
8
3
2
1k
4
1
6
100
18pF
–5V
3.3k
7
5
–
+
–
+
gm
CFA
BANDPASS
OUTPUT
8
3
2
1k
4
1
6
100
18pF
–5V
3.3k
7
5
100
VIN
5V
3k
–
+
100pF
LT1006
1k
180
10k
VC
51k
–5V
2N3906
3.3k
fO = 100kHz AT VC = 0V
fO = 200kHz AT VC = 1V
fO = 400kHz AT VC = 2V
fO = 800kHz AT VC = 3V
fO = 1.6MHz AT VC = 4V
相關(guān)PDF資料
PDF描述
LT1228IS8#TR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
LT1228MJ8#PBF 1 CHANNEL, VIDEO AMPLIFIER, CDIP8
LT1228MJ8#TRPBF 1 CHANNEL, VIDEO AMPLIFIER, CDIP8
LT1228MJ8#TR 1 CHANNEL, VIDEO AMPLIFIER, CDIP8
LT1304CS8-3.3#PBF 1.2 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO8
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