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VXDEMO Datasheet(PDF) 7 Page - IC-Haus GmbH |
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VXDEMO Datasheet(HTML) 7 Page - IC-Haus GmbH |
7 / 11 page iC-VX 3-CHANNEL DIFFERENTIAL LINE DRIVER Rev C1, Page 7/11 L=5m, CL=500pF PLC 24V Z 5V B A BIAS THERMAL SHUTDOWN iC-VX CHAN3 CHAN2 CHAN1 2k 2k 2k C1 1µF C2 1µF VSUB 12 E2 2 E1 1 E3 7 PROG 5 VEE 4 VB2 8 NA1 14 A1 15 A2 13 NA2 11 A3 10 NA3 9 VB1 16 VT 6 VCC 3 Fig. 1: Balanced data transmission at low capacitive load, PROG pin open: I(A) $ 30mA f max . 200 kHz × 500 pF CL × 24 V VB 2 × 413 K &T a 70 K × 75 K/W R thja × 2 channels (1.1) f max . 30 mA 4× VB×(CL %1nF) (1.2) EXAMPLE 1: Short lines Short lines of 5m, for example, are approximations of capacitive load for the iC; no adjustment of characteristic impedance is required. With each switching slope changeover losses of Pc= 1/2 VB × I(A) per channel occur in the iC. The load capacity is reloaded with the guaranteed driver current I(A) $ 30mA. These changeover losses determine the possible cut-off frequency, since the high chip power loss without cooling results in shutdown of the iC. At high capacitive load the transmission rate can also be limited by the fall and rise times wich reduce the signal strength. As a typical application, Fig. 1 shows the transmission of the output signals of an incremental rotary encoder (track A, track B, index pulse Z) to a programmable control (PLC). The maximum signal frequency which is limited by the power loss can be estimated by standardizing the limiting values of the example for short lines: If the slew-rate is the limiting factor, the following applies for the maximum signal frequency (saturation voltages neglected): CL = Capacitive load at output A to output NA VB = Supply voltage T a = Ambient temperature R thja = Thermal resistance chip/board/ambient (R thja = Rthjb + Rthba) |
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