| Part Numbert | Mfg | Packt | D/C | Descriptiont | Qty | Company/Contact | |
| ST93C461 | ST | SOP8 | 05+ | 500 |
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| ST93C461 | ST | SOP8 | 05+ | ＳＴＯＣＫ | 200 |
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ST93C461 Datasheet
ST93C461 Price
ST93C461 on stock Notes about testing the RF2138 The test setup shown above includes two attenuators. The 3dB pad at the input is to minimize the effects that the switching of the input impedance of the PA has on the signal generator. When Vapc is switched quickly, the resulting input impedance change can cause the signal generator to vary its output signal, either in output level or in frequency. Instead of an attenuator an isolator may also be used. The attenuator at the output is to prevent damage to the spec- trum analyzer, and should be able to handle the power. The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Additional error is added by crystal frequency drift caused by temperature shifts. External circuit noise coupled into the oscillator circuit may result in the clock running fast. Figure 5 shows a typical PC board layout for isolating the crystal and oscillator from noise. Refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks for detailed information |
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