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TS3002ITD822T Datasheet(PDF) 10 Page - Silicon Laboratories |
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TS3002ITD822T Datasheet(HTML) 10 Page - Silicon Laboratories |
10 / 13 page TS3002 Page 10 TS3002 Rev. 1.0 signal at its PWMOUT terminal that is anti-phase with respect to FOUT. In addition, applying a voltage at the CNTRL both enables the TS3002’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, BOOST pin to GND), the supply current of the TS3002 is 1µA; enabling the PWM engine increases the TS3002 operating supply current as shown in the electrical specification table. The BOOST pin controls the propagation delay of the TS3002’s internal comparators. When BOOST is connected to GND, the TS3002’s maximum programmable operating frequency is ~90kHz. Connecting the BOOST pin to VDD reduces the propagation delay of the internal oscillators, thereby extending the high end maximum operating frequency to 290kHz. APPLICATIONS INFORMATION Minimizing Power Consumption To keep the TS3002’s power consumption low, resistive loads at the FOUT and PWMOUT terminals increase dc power consumption and therefore should be as large as possible. Capacitive loads at the FOUT and PWMOUT terminals increase the TS3002’s transient power consumption and, as well, should be as small as possible. One challenge to minimizing the TS3002’s transient power consumption is the probe capacitance of oscilloscopes and frequency counter instruments. Most instruments exhibit an input capacitance of 15pF or more. Unless buffered, the increase in transient load current can be as much as 400nA. To minimize capacitive loading, the technique shown in Figure 1 can be used. In this circuit, the principle of series-connected capacitors can be used to reduce the effective capacitive load at the TS3002’s FOUT and PWMOUT terminals. To determine the optimal value for CEXT once the probe capacitance is known by simply solving for CEXT using the following expression: CEXT= 1 1 CLOAD(EFF) - 1 CPROBE For example, if the instrument’s input probe capacitance is 15pF and the desired effective load capacitance at either or both FOUT and PWMOUT terminals is to be ≤5pF, then the value of CEXT should be ≤7.5pF. TS3002 Start-up Time As the TS3002 is powered up, its FOUT terminal (and PWMOUT terminal, if enabled) is active once the applied VDD is higher than 0.9 volt. Once the applied VDD is higher than 0.9 volt, the master oscillator achieves steady-state operation within 1.2ms. Current- and Voltage-Controlled Oscillators The TS3002 can be configured into a Current-Controlled Oscillator as shown in Figure 2. With a current source sourcing a current of 223nA to 262nA, FOUT can generate an output signal with a frequency range of 5.2kHz to 90kHz. In a similar manner, a Voltage-Controlled Oscillator can be configured as shown in Figure 3. In this case, a voltage source sourcing a voltage of 290mV to Figure 1: Using an External Capacitor in Series with Probes Reduces Effective Capacitive Load. Figure 2: Configuring the TS3002 into a Current-Controlled Oscillator. |
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