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TS9004 Datasheet(PDF) 11 Page - Silicon Laboratories |
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TS9004 Datasheet(HTML) 11 Page - Silicon Laboratories |
11 / 13 page TS9004 TS9004 Rev. 1.0 Page 11 Bar-Graph Level Gauge A simple four-stage level detector is shown in Figure 3 using the TS9004. Due to its high output source capability, the TS9004 is perfect for driving LEDs. When all of the LEDs are on, the threshold voltage is given as VIN = (R1 + R2)/R1 volts. All other threshold voltages are scaled down accordingly by ¾, ½, and ¼ the threshold voltage. The current through the LEDs is limited by the output resistors. Level Shifter Figure 4 provides a simple way to shift from bipolar ±5V inputs to TTL signals by using the TS9004. To protect the comparator inputs, 10k Ω resistors are placed in series and do not have an effect on the performance of the circuit. Figure 3. Bar-Graph Level Gauge Figure 4. Level Shifter: ±5V Input into CMOS output |
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