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参数资料
| 型号： | LT1228MJ8#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, CDIP8 |
| 封装： | 0.300 INCH, HERMETIC SEALED, LEAD FREE, CERAMIC, DIP-8 |
| 文件页数： | 3/20页 |
| 文件大小： | 401K |
| 代理商： | LT1228MJ8#TRPBF |
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compliance compatible with Pin 5 of the LT1228. There-
fore, the easiest way to digitally control the set current is
to use a voltage output DAC and a voltage-to-current
circuit. The previous voltage-to-current converter will take
the output of any voltage output DAC and drive Pin 5 with
a proportional current. The R, 2R CMOS multiplying DACs
operating in the voltage switching mode work well on both
single and split supplies with the above circuit.
Logarithmic control is often easier to use than linear
control. A simple circuit that doubles the set current for
each additional volt of input is shown in the voltage
controlled state variable filter application near the end of
this data sheet.
Transconductance Amplifier Frequency Response
The bandwidth of the transconductance amplifier is a
function of the set current as shown in the characteristic
curves. At set currents below 100
A, the bandwidth is
approximately:
–3dB bandwidth = 3 1011 ISET
The peak bandwidth is about 80MHz at 500
A. When a
resistor is used to convert the output current to a voltage,
the capacitance at the output forms a pole with the
resistor. The best case output capacitance is about 5pF
with
±15V supplies and 6pF with ±5V supplies. You must
add any PC board or socket capacitance to these values to
get the total output capacitance. When using a 1k resistor
at the output of the transconductance amp, the output
capacitance limits the bandwidth to about 25MHz.
The output slew rate of the transconductance amplifier is
the set current divided by the output capacitance, which is
6pF plus board and socket capacitance. For example with
the set current at 1mA, the slew rate would be over
100V/
s.
Transconductance Amp Small-Signal Response
ISET = 500A, R1 = 50
CURRENT FEEDBACK AMPLIFIER
The LT1228 current feedback amplifier has very high
noninverting input impedance and is therefore an excel-
lent buffer for the output of the transconductance ampli-
fier. The noninverting input is at Pin 1, the inverting input
at Pin 8 and the output at Pin 6. The current feedback
amplifier maintains its wide bandwidth for almost all
voltage gains making it easy to interface the output levels
of the transconductance amplifier to other circuitry. The
current feedback amplifier is designed to drive low imped-
ance loads such as cables with excellent linearity at high
frequencies.
Feedback Resistor Selection
The small-signal bandwidth of the LT1228 current feed-
back amplifier is set by the external feedback resistors and
the internal junction capacitors. As a result, the bandwidth
is a function of the supply voltage, the value of the
feedback resistor, the closed-loop gain and load resistor.
The characteristic curves of bandwidth versus supply
voltage are done with a heavy load (100
) and a light load
(1k) to show the effect of loading. These graphs also show
相关PDF资料 |
PDF描述 |
|---|---|
| LT1228MJ8#TR | 1 CHANNEL, VIDEO AMPLIFIER, CDIP8 |
| LT1304CS8-3.3#PBF | 1.2 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT1304CS8-3.3#TRPBF | 1.2 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT1304CS8-3.3#TR | 1.2 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT1319CS#PBF | INFRARED, RECEIVER IC, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1229 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual and Quad 100MHz Current Feedback Amplifiers |
| LT1229C | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual and Quad 100MHz Current Feedback Amplifiers |
| LT1229CJ8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual and Quad 100MHz Current Feedback Amplifiers |
| LT1229CN8 | 功能描述:IC CURRNT FEEDBACK AMP DUAL 8DIP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
| LT1229CN8#PBF | 功能描述:IC CURRNT FEEDBACK AMP DUAL 8DIP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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