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RC2207 Datasheet(PDF) 2 Page - Raytheon Company |
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RC2207 Datasheet(HTML) 2 Page - Raytheon Company |
2 / 12 page RC2207 PRODUCT SPECIFICATION 2 Pin Assignments Pin Descriptions Pin Name Pin Number Pin Function Description Bias for Single Supply 11 For single supply operations, pin 11 should be externally biased to a potential between +VS/3 and +VS/2 (see Figure 8). The bias current at pin 11 is nominally 5% of the total oscillation timing current IT. Binary Keying Inputs 8, 9 The internal impedance at these pins is approximately 5 k Ω. Keying levels are <1.4V for zero and > 3V for one logic levels referenced to the DC voltage at pin 10. Ground 10 For split supply operation, this pin serves as circuit ground. For single supply operation, pin 10 should be AC grounded through a 1 µF bypass capacitor. During split supply operation, a ground current of 2 IT flows out of this terminal, where IT is the total timing current. Squarewave Output 13 The squarewave output at pin 13 is an open-collector stage capable of sinking up to 20 mA of load current. RL serves as a pull-up load resistor for this output. Recommended values for RL range from 1 k Ω to 10 kΩ Supply Voltage (+VS, –VS) 1, 12 The RC2207 is designed to operate over a power supply range of +4V to ±13V for split supplies, or 8V to 26V for single supplies. At high supply voltages, the frequency sweep range is reduced. Performance is optimum for ±6V, or 12V single supply operation. Timing Capacitor 2, 3 The oscillator frequency is inversely proportional to the timing capacitor, C. The minimum capacitance value is limited by stray capacitances and the maximum value by physical size and leakage current considerations. Recommended values range from 100 pF to 100 µF. The capacitor should be non-polarized. Timing Resistors (R1–R4) 4–7 The timing resistors determine the total timing current, IT, available to charge the timing capacitor. Values for timing resistors can range from 1.5 k Ω to 2 MΩ; however, for optimum temperature and power supply stability, recommended values are 4 k Ω to 200 kΩ. To avoid parasitic pick up, timing resistor leads should be kept as short as possible. For noise environments, unused or deactivated timing terminals should be bypassed to ground through 0.1 µF capacitors. Otherwise, they may be left open. Trianglewave Output 14 The output at pin 14 is a trianglewave with a peak swing of approximately one-half of the total supply voltage. Pin 14 has a very low output impedance of 10 Ω and is internally protected against short circuits. Notice that the triangle waveform linearity is sensitive to parasite coupling between the square and the trianglewave outputs (pins 13 and 14). In board layout or circuit wiring, care should be taken to minimize stray wiring capacitance between those pins. 1 2 3 4 5 6 7 14 13 12 11 10 9 8 65-2207-02 Binary Keying Inputs GND Bias Squarewave Output Trianglewave Output +VS Timing Capacitor Timing Resistors R1 R2 R3 R4 +VS |
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