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TS3001 データシート(PDF) 8 Page - Touchstone Semiconductor Inc |
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TS3001 データシート(HTML) 8 Page - Touchstone Semiconductor Inc |
8 / 10 page TS3001 Page 8 TS3001DS r1p0 RTFDS APPLICATIONS INFORMATION Minimizing Power Consumption To keep the TS3001 ’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 TS3001 ’s transient power consumption and, as well, should be as small as possible. One challenge to minimizing the TS3001 ’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 TS3001 ’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: C T = 1 1 CLOA ( FF) 1 CPRO 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 C EXT should be ≤7.5pF. TS3001 Start-up Time As the TS3001 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 TS3001 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 341mV can generate an FOUT output signal frequency range of 5.2kHz to 90kHz as well. It is recommended to use resistor values with a 1% tolerance. Figure 1: Using an External Capacitor in Series with Probes Reduces Effective Capacitive Load. Figure 2: Configuring the TS3001 into a Current-Controlled Oscillator. Figure 3: Configuring the TS3001 into a Voltage-Controlled Oscillator. |
同様の部品番号 - TS3001 |
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同様の説明 - TS3001 |
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