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PLL with I2C Bus for AM/FM Receivers SDA 4331X 1 1.1 · · · · · Overview Features 155 MHz FM and 40 MHz AM input frequency 30 mVeff AM and 50 mVeff FM sensitivity Additional open drain ports controlled by I2C Bus 2-pin quartz oscillator Fast phase detector with short anti-backlash pulses P-DSO-24-1 and polarity reversal · Charge pump current programmable in four steps up to 4.5 mA · Frequency resolution of 1, 5 and 10 kHz AM and 12.5, 25 and 50 kHz FM · P-DSO-24 package Type SDA 4331X 1.2 Application Ordering Code Q67100-H5139 Package P-DSO-24-1 The SDA 4331X provides separated input and output ports for AM and FM and is well suited for extremely fast loop settling times in the FM mode. Semiconductor Group 1 04.96 SDA 4331X 1.3 Pin Configuration (top view) P-DSO-24-1 Figure 1 Semiconductor Group 2 04.96 SDA 4331X 1.4 Pin Definitions and Functions Input (I) Output (O) I I/O I Function Supply voltage digital (5 V) Clock I2C Bus Data I2C Bus Address selection, sets the LSB of the IC-address 10 V open drain output, controlled via I2C Bus 10 V open drain output, indicating the operation mode (H = AM) Input for the FM signal from VCO Ground analog I Input for the AM signal from VCO Pin No. Symbol 1 2 3 4 5 6...9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 VDD1 SCL SDA A0 N.C. SA1 ... SA4 O AM/FM FMIN GNDAN AMIN N.C. N.C. O I IREF PDFM PDAM PDFMA PDAMA I O O O O Reference current, setting the base current level for the charge pumps FM charge pump output AM charge pump output Source follower output FM Source follower output AM Supply voltage digital for charge pump and source followers (up to 10 V) VDD2 OSCFB OSCIN GND I/O I Oscillator feedback, quartz terminal Oscillator input, quartz terminal, optionally input for external reference Ground digital Semiconductor Group 3 04.96 SDA 4331X 1.5 Functional Block Diagram Figure 2 Block Diagram Semiconductor Group 4 04.96 SDA 4331X 2 Functional Description The SDA 4331X is a radio PLL controlled via I2C Bus for frequency synthesis in the AM and FM range. 3 Circuit Description The reference frequency for the PLL is derived from the quartz oscillator OSC1). The R-prescaler can be adapted to quartz frequencies of 4, 8 or 10.25 MHz, respectively, yielding an internal 50 kHz reference. Programming the R-counter sets the phase detector reference frequency to 1, 5 or 10 kHz in the AM mode or to 12.5, 25 or 50 kHz in the FM mode. The VCO frequency is set by programming the A/N-counter which operates as dual-modulus counter for FM and AM using a divide by 4/5 swallow counter. The phase detector drives two different charge pumps for AM and FM mode. Additional source followers are connected to the charge pump. There are four programmable current levels for each charge pump. The supply voltage for the charge pump and the source followers is supplied via the VDD2 pin and can reach 10 V maximum. AM/FM is an open drain output as well as the additional outputs SA1 ... SA4 which are cont