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參數(shù)資料
| 型號： | LT1228IS8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CRNT FEEDBK AMP 100MHZ 8SOIC |
| 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： | -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-SO |
| 包裝： | 管件 |
LT1228
18
1228fd
TYPICAL APPLICATIONS
Voltage Controlled State Variable Filter
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
The state variable filter has both lowpass and bandpass
outputs.EachLT1228isconfiguredasavariableintegrator
whose frequency is set by the attenuators, the capacitors
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
transistors 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 50A 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.
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