參數(shù)資料
型號(hào)： LMV822MX/NOPB
廠商： National Semiconductor
文件頁(yè)數(shù)： 9/38頁(yè)
文件大小： 0K
描述： IC OP AMP RAIL/RAIL 8-SOIC
標(biāo)準(zhǔn)包裝： 1
放大器類(lèi)型： 通用
電路數(shù)： 2
輸出類(lèi)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(lèi)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： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 1269 (CN2011-ZH PDF)
其它名稱(chēng)： LMV822MXDKR
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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