SP5024

Obsolescence Notice This product is obsolete. This information is available for your convenience only. www.DataSheet4U.com For more information on Zarlink’s obsolete products and replacement product lists, please visit http://products.zarlink.com/obsolete_products/ SP5024 3-Wire Bus Controlled Synthesiser DS2452 - 2.1 December 1992 The SP5024 is a programming variant of the SP5510 allowing the design of one tuner with either I 2C bus or 3-wire bus format depending on which device is inserted. The SP5024, when used with a TV varicap tuner, forms a complete phase locked loop tuning system. The circuit consists of a divide-by-8 prescaler with its own preamplifier and a 15 bit programmable divider controlled by a serially - loaded data register. Four open-collector outputs, each independently programmable, are included. The device has two modes of operation selected by the 'mode selected input'. In mode 1 the comparison frequency is 7.8125kHz and the programmable divider MSB is bypassed; mode 2 comparison frequency is 6.25kHz. The comparison frequencies are both obtained from a 4MHz crystal controlled on-chip oscillator. The comparator has a charge pump output with an output amplifier stage around which feedback may be applied. Only one external transistor is required for varicap line driving. CHARGE PUMP CRYSTAL MODE SELECT DATA CLOCK PORT P4 PORT P3 PORT P2 PORT P1 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 DRIVE OUTPUT VEE RF INPUT RF INPUT VCC NC NC LOCK ENABLE FEA...