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| 型号： | LMV824MT/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 9/38页 |
| 文件大小： | 0K |
| 描述： | IC OP AMP R-R LOW V LP 14-TSSOP |
| RoHS指令信息： | LMV824MT Material |
| 标准包装： | 94 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 输出类型： | 满摆幅 |
| 转换速率： | 2 V/µs |
| 增益带宽积： | 5.6MHz |
| 电流 - 输入偏压： | 100nA |
| 电压 - 输入偏移： | 3500µV |
| 电流 - 电源： | 1mA |
| 电流 - 输出 / 通道： | 45mA |
| 电压 - 电源，单路/双路(±)： | 2.5 V ~ 5.5 V，±1.25 V ~ 2.75 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： | 管件 |
| 产品目录页面： | 1269 (CN2011-ZH PDF) |
| 其它名称： | *LMV824MT *LMV824MT/NOPB LMV824MT |
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SNOS032G – AUGUST 1999 – REVISED NOVEMBER 2013
TELEPHONE-LINE TRANSCEIVER
The telephone-line transceiver of Figure 38 provides a full-duplexed connection through a PCMCIA, miniature
transformer. The differential configuration of receiver portion (UR), cancels reception from the transmitter portion
(UT). Note that the input signals for the differential configuration of UR, are the transmit voltage (VT) and VT/2.
This is because Rmatch is chosen to match the coupled telephone-line impedance; therefore dividing VT by two
(assuming R1 >> Rmatch). The differential configuration of UR has its resistors chosen to cancel the VT and VT/2
inputs according to the following equation:
(1)
Figure 38. Telephone-line Transceiver for a PCMCIA Modem Card
Note that Cr is included for canceling out the inadequacies of the lossy, miniature transformer. Refer to
application note AN-397 for detailed explanation.
“SIMPLE” MIXER (AMPLITUDE MODULATOR)
The mixer of Figure 39 is simple and provides a unique form of amplitude modulation. Vi is the modulation
frequency (FM), while a +3V square-wave at the gate of Q1, induces a carrier frequency (FC). Q1 switches
(toggles) U1 between inverting and non-inverting unity gain configurations. Offsetting a sine wave above ground
at Vi results in the oscilloscope photo of Figure 40.
The simple mixer can be applied to applications that utilize the Doppler Effect to measure the velocity of an
object. The difference frequency is one of its output frequency components. This difference frequency magnitude
(/FM-FC/) is the key factor for determining an object's velocity per the Doppler Effect. If a signal is transmitted to a
moving object, the reflected frequency will be a different frequency. This difference in transmit and receive
frequency is directly proportional to an object's velocity.
Figure 39. Amplitude Modulator Circuit
Copyright 1999–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMV824MTX | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LMV824MTX/E7000973 | 制造商:Texas Instruments 功能描述: |
| LMV824MTX/NOPB | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LMV824MTX/NOPB | 制造商:Texas Instruments 功能描述:IC, OP-AMP, 5.6MHZ, 2V/ us, TSSOP-14 |
| LMV824MTX/S7001910 | 制造商:Texas Instruments 功能描述: |
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