參數(shù)資料
型號： LMV822M/NOPB
廠商： National Semiconductor
文件頁數(shù)： 9/38頁
文件大?。?/td> 0K
描述： IC OP AMP R-R LOW VOLT LP 8-SOIC
標(biāo)準(zhǔn)包裝： 95
放大器類型： 通用
電路數(shù)： 2
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 2 V/µs
增益帶寬積： 5.6MHz
電流 - 輸入偏壓： 100nA
電壓 - 輸入偏移： 3500µV
電流 - 電源： 500µA
電流 - 輸出 / 通道： 45mA
電壓 - 電源，單路/雙路(±)： 2.5 V ~ 5.5 V，±1.25 V ~ 2.75 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-SOIC
包裝： 管件
產(chǎn)品目錄頁面： 1269 (CN2011-ZH PDF)
其它名稱： *LMV822M
*LMV822M/NOPB
LMV822M
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
17
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LMV822MX/NOPB 功能描述:運算放大器 - 運放 LOW VLTG, LOW POWER, RRO, 5 MHZ OP AMPS 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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LMV822Q1MMNOPB 制造商:Texas Instruments 功能描述:LMV822Q1MMNOPB
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