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TS3001 Datasheet(PDF) 9 Page - Touchstone Semiconductor Inc |
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TS3001 Datasheet(HTML) 9 Page - Touchstone Semiconductor Inc |
9 / 10 page TS3001 TS3001DS r1p0 Page 9 RTFDS Using a Potentiometer to Trim the TS3001 ’s Output Frequency By using a fixed resistor and a potentiometer, the output frequency of the TS3001 can be trimmed as shown in Figure 4. By selecting a fixed resistor R1 with a tolerance of 0.1% and a potentiometer P1 with a 5% tolerance, the output frequency can be trimmed to provide a ±2% trimming range. As shown in Figure 4, R1+P1 set the output frequency to 25.052kHz when P1 = 0Ω and with P1 =200kΩ, the resulting output frequency is 24.024kHz. Using Standard Resistors to Increase FOUT Resolution The TS3001 can be configured to provide a 0.1% resolution on the output frequency as shown in Figure 5. To do so, R1 can be set to approximately 10% of the value selected for R2. In addition, R2 and R1 should be chosen with a 0.1% and 1% tolerance, respectively. Since R2 is 90% of the total resistance, it has the largest impact on the resolution of the output frequency. With R1 = 91kΩ and R2 = 910kΩ, the output frequency is 90kHz and with R1 = 400kΩ and R2 = 4MΩ, the output frequency is 23kHz. Figure 4: Using a Fixed Resistor and a Potentiometer to Trim the T 3001’s Output Frequency. Figure 5: Setting the T 3001’s Output Frequency to 0.1% Resolution using Standard Resistors. |
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