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INTEGRATED CIRCUITS DATA SHEET SAA1057 Radio tuning PLL frequency synthesizer Product specification File under Integrated Circuits, IC01 November 1983 Philips Semiconductors Product specification Radio tuning PLL frequency synthesizer GENERAL DESCRIPTION The SAA1057 is a single chip frequency synthesizer IC in I2L technology, which performs all the tuning functions of a PLL radio tuning system. The IC is applicable to all types of radio receivers, e.g. car radios, hi-fi radios and portable radios. Features · On-chip prescaler with up to 120 MHz input frequency. · On-chip AM and FM input amplifiers with high sensitivity (30 mV and 10 mV respectively). · Low current drain (typically 16 mA for AM and 20 mA for FM) over a wide supply voltage range (3,6 V to 12 V). · On-chip amplifier for loop filter for both AM and FM (up to 30 V tuning voltage). QUICK REFERENCE DATA Supply voltage ranges VCC1 VCC2 VCC3 Supply currents Input frequency ranges at pin FAM at pin FFM Maximum crystal input frequency Operating ambient temperature range PACKAGE OUTLINE 18-lead DIL; plastic (SOT102H); SOT102-1; 1996 September 2. fFAM fFFM fXTAL Tamb ICC1 + ICC2 ICC3 3,6 to 12 3,6 to 12 SAA1057 · On-chip programmable current amplifier (charge pump) to adjust the loop gain. · Only one reference frequency for both AM and FM. · High signal purity due to a sample and hold phase detector for the in-lock condition. · High tuning speed due to a powerful digital memory phase detector during the out-lock condition. · Tuning steps for AM are: 1 kHz or 1,25 kHz for a VCO frequency range of 512 kHz to 32 MHz. · Tuning steps for FM are: 10 kHz or 12,5 kHz for a VCO frequency range of 70 MHz to 120 MHz. · Serial 3-line bus interface to a microcomputer. · Test/features. V V V mA mA MHz MHz MHz °C VCC2 to 31 typ. typ. 18 0,8 512 kHz to 32 70 to 120 > 4 -25 to + 80 November 1983 2 Philips Semiconductors Product specification Radio tuning PLL frequency synthesizer SAA1057 Fig.1 Block diagram. November 1983 3 Philips Semiconductors Product specification Radio tuning PLL frequency synthesizer GENERAL DESCRIPTION SAA1057 The SAA1057 performs the entire PLL synthesizer function (from frequency inputs to tuning voltage output) for all types of radios with the AM and FM frequency ranges. The circuit comprises the following: · Separate input amplifiers for the AM and FM VCO-signals. · A divider-by-10 for the FM channel. · A multiplexer which selects the AM or FM input. · A 15-bit programmable divider for selecting the required frequency. · A sample and hold phase detector for the in-lock condition, to achieve the high spectral purity of the VCO signal. · A digital memory frequency/phase detector, which operates at a 32 times higher frequency than the sample and hold phase detector, so fast tuning can be achieved. · An in-lock counter detects when the system is in-lock. The digital phase detector is switched-off automatically when an in-lock condition is detected. · A reference