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SM9503A Arkusz danych(PDF) 7 Page - Nippon Precision Circuits Inc |
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SM9503A Arkusz danych(HTML) 7 Page - Nippon Precision Circuits Inc |
7 / 9 page SM9503A NIPPON PRECISION CIRCUITS INC.—7 FUNCTIONAL DESCRIPTION AGC Amplifier and Gain Hold Function The input voltage from the antenna is amplified by the AGC amplifier. The gain can be monitored by the volt- age on pin CP, and can be changed by varying the CP voltage. An external capacitor Cp can be connected to CP to stabilize the voltage, but the gain tracking time is dependent on the capacitance. When HLDN is open (or HIGH), the gain automatically adjusts to follow the post-amplifier detector signal. When HLDN is LOW, the immediately preceding gain is held for an interval determined by the Cp capacitance. Crystal Filter Circuit External crystals are used as filters. The center frequency and bandwidth of the filters is determined by the crystal characteristics. If the center frequency is lower than the target frequency, it is necessary to add CL capacitor for the adjustment frequency. If Q of the crystal filter is higher and the output delay is larger, it is nec- essary to add RL to adjust it. Adding a compensation capacitor CC, it is possible to select built-in or external, cancels the high-frequency components pass through the crystal parallel capacitance. Compensation capacitors are built in, and wiring them inside makes possible to select versions of the required capacitances from 0.5pF to 2.0pF. µ Detector Circuit The amplified signal is full-wave rectified and passed through a lowpass filter detector. The detector output is input to peak hold (pin CP) and bottom hold (pin CB) circuits to form the decoder reference potentials and peak hold potential for AGC control. The case of using the external compensation capacitor XO1 CL XI XO2 CC AGC Amp Post Amp RL CC The case of using built-in compensation capacitor XO1 CL XI XO2 AGC Amp Post Amp RL CC Amplifier Rectifier LPF Peak/ Bottom Hold Peak hold Bottom hold VDD potential VDD potential VDD potential |
Podobny numer części - SM9503A |
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Podobny opis - SM9503A |
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