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SC9257 Datasheet(PDF) 1 Page - Silan Microelectronics Joint-stock |
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SC9257 Datasheet(HTML) 1 Page - Silan Microelectronics Joint-stock |
1 / 28 page Silan Semiconductors SC9257 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD REV: 1.0 2001.10.18 1 PLL FOR DTS DESCRIPTION The SC9257 is phase-locked loop (PLL) LSIs for digital tuning systems (DTS) with built in 2 modulus prescalers. All functions ate controlled through 3 serial bus lines. These LSIs are used to configure high-performance digital tuning system. FEATURES * Optimal for configuring digital tuning systems in high-fi tuners and car stereos. * built-in prescalers. Operate at input frequency ranging from 30~150 MHz during FM IN input (with 2 modulus prescaler) and at 0.5~40MHz during AM IN input (with 2 modulus prescaler or direct dividing). * 16 bit programmable counter, dual parallel output phase comparator, crystal oscillator and reference counter. * 3.6MHz, 4.5MHz, 7.2MHz or 10.8MHz crystal oscillators can be used. * 15 possible reference frequencies. ( When using 4.5MHz crystal) * Built-in 20 bit general-purpose counter for such uses as measuring intermediate frequencies (IF IN1 and IFIN2) and low- frequency pilot signal cycles (SC IN). * High-precision ( ±0.55~±7.15µs) PLL phase error detection. * Numerous general-purpose I/O pins for such uses as peripheral circuit control. SOP-20-300-1.27 DIP-20-300-2.54 * 4 N-channel open-drain output ports (OFF withstanding voltage:12V) for such uses as control signal output. * Standby mode function (turns off FM, AM and IF amps) to save current consumption. * All functions controlled through 3 serial bus lines. * CMOS structure with operating power supply range of VDD=5.0 ±0.5V. PIN CONFIGURATION 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 18 17 XT XT PERIOD CLOCK DATA OT-1 OT-2 OT-3 OT-4 DO2 DO1 I/O-7/SCIN I/O - 8/IFIN1 GND FMIN AMIN VDD 20 19 I/O - 5/CLK I/O-6 I/O - 9/IFIN2 |
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