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TS3001ITD822T Datasheet(PDF) 7 Page - Touchstone Semiconductor Inc |
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TS3001ITD822T Datasheet(HTML) 7 Page - Touchstone Semiconductor Inc |
7 / 10 page TS3001 TS3001DS r1p0 Page 7 RTFDS BLOCK DIAGRAM THEORY OF OPERATION The TS3001 is a user-programmable oscillator where the period of the square wave at its FOUT terminal is generated by an external resistor. The output frequency is given by: FOUT (kHz) = 1 tFOUT ( s) 1 k x R T MΩ where the scalar k is approximately 9.09E3. With an RSET = 4.32M Ω, the output frequency is approximately 25kHz with a 50% duty cycle. As design aids, Tables 1 lists TS3001 ’s typical FOUT for various standard values for RSET. The TS3001 also provides a separate PWM output signal at its PWMOUT terminal that is anti-phase with respect to FOUT. In addition, applying a voltage at the CNTRL both enables the TS3001 ’s internal PWM engine as well as adjusting the duty cycle from 12% to 90%. A dc control voltage equal to 0.03 x VDD applied to the CNTRL pin enables the PWM engine to set the duty cycle to 12%. A dc control voltage equal to 0.27 x VDD increases the duty cycle to 90% and connecting CNTRL to VDD disables the PWM engine altogether. Configured for nominal operation (PWM engine OFF), the supply current of the TS3001 is 1µA; enabling the PWM engine increases the TS3001 operating supply current as shown in the electrical specification table. Table 1: FOUT vs RSET RSET (MΩ) FOUT (kHz) 1 110 2.49 44 4.32 25.5 6.81 16 9.76 11 |
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