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XR-2209CN Datasheet(PDF) 6 Page - Exar Corporation |
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XR-2209CN Datasheet(HTML) 6 Page - Exar Corporation |
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6 / 20 page  XR-2209 6 Rev. 2.02 RL Square Wave Output Triangle Wave S2 C 1 mF I+ R 6 BIAS 5 TWO 8 SWO 7 C2 3 C1 2 1 XR-2209 S1 TR Output 1 mF I- 10K D1 1 mF Figure 4. Test Circuit for Split Supply Operation VCC VCC VCC VEE VEE VEE 4 OPERATING CONSIDERATIONS Supply Voltage (Pins 1 and 6) The XR-2209 is designed to operate over a power supply range of $4V to $13V for split supplies, or 8V to 26V for single supplies. Figure 5 shows the permissible supply voltage for operation with unequal split supply voltages. Figure 6 and Figure 7 show supply current versus supply voltage. Performance is optimum for $6V split supply, or 12V single supply operation. At higher supply voltages, the frequency sweep range is reduced. Ground (Pin 6) For split supply operation, this pin serves as circuit ground. For single supply operation, pin 6 should be ac grounded through a 1 mF bypass capacitor. During split supply operation, a ground current of 2 IT flows out of this terminal, where IT is the total timing current. Bias for Single Supply (Pin 5) For single supply operation, pin 5 should be externally biased to a potential between VCC/3 and VCC/2V (see Figure 3.) The bias current at pin 5 is nominally 5% of the total oscillation timing current, IT. Bypass Capacitors The recommended value for bypass capacitors is 1 mF although larger values are required for very low frequency operation. Timing Resistor (Pin 4) The timing resistor determines the total timing current, IT, available to charge the timing capacitor. Values for the timing resistor can range from 2k W to 2MW; however, for optimum temperature and power supply stability, recommended values are 4k W to 200kW (see Figure 8, Figure 9, Figure 10 and Figure 11.) To avoid parasitic pick up, timing resistor leads should be kept as short as possible. |
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Similar Description - XR-2209CN |
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