전자부품 데이터시트 검색엔진 |
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AM26LV32IDRE4 데이터시트(PDF) 9 Page - Texas Instruments |
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AM26LV32IDRE4 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 22 page AM26LV32C, AM26LV32I LOW VOLTAGE HIGHSPEED QUADRUPLE DIFFERENTIAL LINE RECEIVER SLLS202E − MAY 1995 − REVISED JUNE 2005 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION In most applications, it is not customary to have a common-mode input close to ground and to have a differential voltage larger than 2 V. Since the common-mode input voltage is typically around 1.5 V, a 2-V VID would result in a VIL of 0.5 V, thus satisfying the recommended VIL level of greater than 0.4 V. Figure 8 plots seven different input threshold curves from a variety of production lots and shows how the fail-safe circuitry behaves with the input common-mode voltage levels. These input threshold curves are representative samples of production devices. The curves specifically illustrate a typical range of input threshold variation. The AM26LV32 is specified with ±200 mV of input sensitivity to account for the variance in input threshold. Each data point represents the input’s ability to produce a known state at the output for a given VIC and VID. Applying a differential voltage at or above a certain point on a curve would produce a known state at the output. Applying a differential voltage less than a certain point on a curve would activate the fail-safe circuit and the output would be in a high state. For example, inspecting the top input threshold curve reveals that for a VIC + 1.6 V, VID yields around 87 mV. Applying 90 mV of differential voltage to this particular production lot generates a known receiver output voltage. Applying a VID of 80 mV activates the input fail-safe circuitry and the receiver output is placed in the high state. Texas Instruments specifies the input threshold at ±200 mV, since normal process variations affect this parameter. Note that at common-mode input voltages around 0.2 V, the input differential voltages are low compared to their respective data points. This phenomenon points to the fact that the inputs are very sensitive to small differential voltages around 0.2 V VIC. It is recommended that VIC levels be kept greater than 0.5 V to avoid this increased sensitivity at VIC [ 0.2 V. In most applications, since VIC typically is 1.5 V, the fail-safe circuitry functions properly to provide a high state at the receiver output. −0.8 −0.6 −0.4 −0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 −1 0 10 20 30 40 50 60 70 80 90 100 VIC − Common-Mode Input Voltage − V Not Recommended Most Applications Increased Receiver Input Sensitivity Figure 8. VIC Versus VID Receiver Sensitivity Levels |
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