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| 型号： | LT1256CS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP VIDEO FADE CONTRLD 14SOIC |
| 标准包装： | 2,500 |
| 应用： | 电流反馈 |
| 电路数： | 1 |
| -3db带宽： | 40MHz |
| 转换速率： | 300 V/µs |
| 电流 - 电源： | 14.5mA |
| 电流 - 输出 / 通道： | 40mA |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 30 V，±2.5 V ~ 15 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
11
LT1251/LT1256
APPLICATIONS INFORMATION
WU
U
Capacitive Loads
Increasing the value of the feedback resistor reduces the
bandwidth and open-loop gain of the LT1251/LT1256;
therefore, the pole introduced by a capacitive load can be
overcome. If there is little or no resistive load in parallel
with the load capacitance, the output stage will resonate,
peak and possibly oscillate. With a resistive load of 150
,
any capacitive load can be accommodated by increasing
the feedback resistor. If the capacitive load cannot be
paralleled with a DC load of 150
, a network of 200pF in
series with 100
should be placed from the output to
ground. Then the feedback resistor should be selected for
best response.
The Null Pin
Pin 6 can be used to adjust the gain of an internal current
mirror to change the output offset. The open circuit
voltage at Pin 6 is set by the full scale current IFS flowing
through 200
to the negative supply. Therefore, the NULL
pin sits 100mV above the negative supply with VFS equal
to 2.5V. Any op amp whose output swings within a few
millivolts of the negative supply can drive the NULL pin.
The AM modulator application shows an LT1077 driving
the NULL pin to eliminate the output DC offset voltage.
Crosstalk
The amount of signal from the off input that appears at the
output is a function of frequency and the circuit topology.
The nature of a current feedback input stage is to force the
voltage at the inverting input to be equal to the voltage at
the noninverting input. This is independent of feedback
and forced by a buffer amplifier between the inputs. When
the LT1251/LT1256 are operating noninverting, the off
input signal is present at the inverting input. Since one end
of the feedback resistor is connected to this input, the off
signal is only a feedback resistor away from the output.
The amount of unwanted signal at the output is deter-
mined by the size of the feedback resistor and the output
impedance of the LT1251/LT1256. The output impedance
rises with increasing frequency resulting in more crosstalk
at higher frequencies. Additionally, the current that flows
in the inverting input is diverted to the supplies within the
chip and some of this signal will also show up at the
output. With a 1.5k feedback resistor, the crosstalk is
down about 86dB at low frequencies and rises to – 78dB
at 1MHz and on to – 60dB at 6MHz. The curves show the
details.
Distortion
When only one input is contributing to the output (VC = 0%
or 100%) the LT1251/LT1256 have very low distortion. As
the control reduces the output, the distortion will increase.
The amount of increase is a function of the current that
flows in the inverting input. Larger input signals generate
more distortion. Using a larger feedback resistor will
reduce the distortion at the expense of higher output
noise.
CONTROL VOLTAGE (V)
0
GAIN
(V/
V)
100
50
0
2.0
1251/56 F01
0.5
1.0
1.5
2.5
RF2 = 4.3k
RF2 = 1.5k
VFS = 2.5V
Figure 1. Linear Gain Control from 0 to 101
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1259 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Cost Dual and Triple 130MHz Current Feedback Amplifiers with Shutdown |
| LT1259CN | 制造商:Linear Technology 功能描述:AMP DUAL CURRENT F/BACK 1259 DIP |
| LT1259CN#PBF | 功能描述:IC AMP W/SHUTDOWN DUAL 14-DIP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
| LT1259CS | 功能描述:IC AMP W/SHUTDOWN DUAL 14-SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:2pA 电压 - 输入偏移:1000µV 电流 - 电源:85µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:剪切带 (CT) 产品目录页面:680 (CN2011-ZH PDF) 其它名称:MCP6L04T-E/SLCT |
| LT1259CS#PBF | 功能描述:IC AMP W/SHUTDOWN DUAL 14-SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°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:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
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