參數(shù)資料
型號(hào): LT1228CS8
廠商: LINEAR TECHNOLOGY CORP
元件分類(lèi): 音頻/視頻放大
英文描述: CAP 33000UF 50V ELECT TUP SERIES
中文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝: 0.150 INCH, PLASTIC, SOP-8
文件頁(yè)數(shù): 18/20頁(yè)
文件大?。?/td> 435K
代理商: LT1228CS8
LT1228
18
Voltage Controlled State Variable Filter
LT1228 TA18
+
+
g
m
CFA
LOWPASS
OUTPUT
8
3
2
1k
4
1
6
100
18pF
–5V
3.3k
7
5
+
+
g
m
CFA
BANDPASS
OUTPUT
8
3
2
1k
4
1
6
100
18pF
–5V
3.3k
7
5
100
V
IN
5V
5V
3k
3k
+
100pF
LT1006
1k
180
10k
V
C
51k
–5V
2N3906
3.3k
3.3k
f
O
= 100kHz AT V
C
= 0V
f
O
= 200kHz AT V
C
= 1V
f
O
= 400kHz AT V
C
= 2V
f
O
= 800kHz AT V
C
= 3V
f
O
= 1.6MHz AT V
C
= 4V
U
S
A
O
PPLICATI
TYPICAL
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 3V
P–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 V
C
equal zero. The circuit generates 100
μ
A
for V
C
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
μ
A to 800
μ
A for a control
voltage of 0V to 4V. The resulting filter is at 100kHz for V
C
equal zero, and changes it one octave/V of control input.
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