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參數(shù)資料
| 型號(hào)： | LM13700M |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| 中文描述： | DUAL OP-AMP, 4000 uV OFFSET-MAX, 2 MHz BAND WIDTH, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁(yè)數(shù)： | 9/24頁(yè) |
| 文件大小： | 633K |
| 代理商： | LM13700M |
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Stereo Volume Control
(Continued)
Noting that the gain of the LM13700 amplifier of Figure 3
may be controlled by varying the linearizing diode current I
D
as well as by varying I
, Figure 7 shows an AGC Amplifier
using this approach.As V
reaches a high enough amplitude
(3V
) to turn on the Darlington transistors and the lineariz-
ing diodes, the increase in I
D
reduces the amplifier gain so
as to hold V
O
at that level.
Voltage Controlled Resistors
An Operational Transconductance Amplifier (OTA) may be
used to implement a Voltage Controlled Resistor as shown in
Figure 8 A signal voltage applied at R
generates a V
to
the LM13700 which is then multiplied by the g
m
of the ampli-
fier to produce an output current, thus:
where g
≈
19.2I
at 25C. Note that the attenuation of V
O
by R and R
is necessary to maintain V
IN
within the linear
range of the LM13700 input.
Figure 9 shows a similar VCR where the linearizing diodes
are added, essentially improving the noise performance of
the resistor. A floating VCR is shown in Figure 10 where
each “end” of the “resistor” may be at any voltage within the
output voltage range of the LM13700.
DS007981-13
FIGURE 6. Four-Quadrant Multiplier
DS007981-14
FIGURE 7. AGC Amplifier
www.national.com
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LM13700M/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 DUAL OP TRANSCOND RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LM13700M/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LM13700MX | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LM13700MX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LM13700N | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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