PLL with I2C Bus for AM/FM Receivers 1 Overview 1.1 Features SDA 4331X • • • • • 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 Ordering Code Package SDA 4331X Q67100-H5139 P-DSO-24-1 1.2 Application 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 Pin No. Symbol Input (I) Output (O) Function 1 VDD1 2 SCL I Clock I2C Bus 3 SDA I/O Data I2C Bus 4 A0 I Address selection, sets the LSB of the IC-address 5 N.C. 6…9 SA1 … SA4 O 10 V open drain output, controlled via I2C Bus 10 AM/FM O 10 V open drain output, indicating the operation mode (H = AM) 11 FMIN I Input for the FM signal from VCO 12 GNDAN 13 AMIN 14 N.C. 15 N.C. 16 Supply voltage digital (5 V) Ground analog I Input for the AM signal from VCO IREF I Reference current, setting the base current level for the charge pumps 17 PDFM O FM charge pump output 18 PDAM O AM charge pump output 19 PDFMA O Source follower output FM 20 PDAMA O Source follower output AM 21 VDD2 22 OSCFB I/O Oscillator feedback, quartz terminal 23 OSCIN I Oscillator input, quartz terminal, optionally input for external reference 24 GND Semiconductor Group Supply voltage digital for charge pump and source followers (up to 10 V) Ground digital 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 controlled by I2C Bus. The I2C Bus interface provides slave receiver functions. There are two addresses selected by the A0 pin. The I2C-protocol (see diagram 1) contains one string for programming all counters and functions. The transfer may be stopped optionally after each word if the remaining functions are not to be altered. After power ON all control signals are undefined, so that the complete write sequence must be executed. 1) The power dissipation of the quartz is given by: Pv = 2 × R1 (Π × fQ × (CO + CL) × VDD)2 R1 … Series resistance of the quartz fQ … Quartz frequency CO … Parallel capacitance of the quartz CL … Load capacitance, including input capacitance of the IC Semiconductor Group 5 04.96 SDA 4331X 4 Electrical Characteristics 4.1 Absolute Maximum Ratings TA = – 25 °C to 85 °C Parameter Symbol VDD1 Supply voltage VDD2 Input voltage VIN Power dissipation per output PQ Power dissipation Ptot Storage temperature TS Output voltage SA1 … SA4, AM/FM VQH ESD voltage (HBM: 1.5 kΩ, 100 pF) VESD Supply voltage Limit Values Unit Remarks min. max. – 0.3 6 V – 0.3 10.5 V – 0.3 VDD1 + 0.3 V – 40 –1 10 mW t.b.d. mW 125 °C 10.5 V 1 kV Note: Maximum ratings are absolute ratings; exceeding only one of these values may cause irreversible damage to the integrated circuit. 4.2 Operational Range Parameter Supply voltage Supply voltage Supply current Supply current1) Ambient temperature Output voltage SA1 … SA4, AM/FM 1) Symbol VDD1 VDD2 IDD1 IDD2 TA VQH Limit Values Unit min. typ. max. 4.5 5 5.5 V 10.3 V 10 mA 0.5 mA + 85 °C VDD2 V 9 4 – 25 Measurement conditions: No load on pins 17 … 20. Note: In the operating range the functions given in the circuit description are fulfilled. Semiconductor Group 6 04.96 SDA 4331X 4.3 AC/DC Characteristics Parameter Symbol Limit Values min. typ. Unit Test Condition max. Input AMIN Input voltage (sine wave) VIN Input capacitance C IIN Input current mVeff VDD1 = 4.5 V 0.5 MHz < fIN < 40 MHz 30 – 50 4 pF 50 µA 0 ≤ VIN ≤ VDD1 Input FMIN Input voltage (sine wave) VIN Input capacitance C IIN Input current VDD1 = 4.5 V mVeff 20 MHz < fIN < 120 MHz mVeff 10 MHz < fIN < 155 MHz 50 120 – 100 4 pF 100 µA 0 ≤ VIN ≤ VDD1 Input OSCIN Input voltage (sine wave) VIN Input capacitance C IIN VIH Input current VDD1 = 4.5 V mVeff fIN = 4 MHz mVeff fIN = 8 MHz mVeff fIN = 10.25 MHz 100 150 200 10 pF – 30 30 µA 0.7 × VDD1 V 0 ≤ VQ ≤ VDD1 Input/Output SDA H-input voltage VDD1 L-input voltage VIL 0.3 × V 0 VDD1 L-output voltage VQL Input leakage current ILeakage Input capacitance C Semiconductor Group – 10 7 0.4 V 10 µA 10 pF IQL = 3 mA, VDD1 = 5 V, CL = 400 pF 0 ≤ VIN ≤ VDD1 04.96 SDA 4331X 4.3 AC/DC Characteristics (cont’d) Parameter Symbol Limit Values min. typ. Unit Test Condition max. Inputs SCL, A0 H-input voltage VIH 0.7 × VDD1 V VDD1 L-input voltage VIL 0.3 × V 0 VDD1 Input leakage current ILeakage Input capacitance C – 10 10 µA 10 pF 0 ≤ VIN ≤ VDD1 Outputs SA1, SA2, SA3, SA4, AM/FM (open drain outputs) L-output voltage VQL 0.4 V VQL 0.1 V IQL = 1 mA VDD1 = 5 V IQL = 0.1 mA Input IREF Input current Voltage at IREF IIN VIREF t.b.d. 100 t.b.d. µA 1.2 V IIN = 100 µA IQ IQ IQ IQ ± 4.5 mA VPD = 4 V ±3 mA ± 1.5 mA ± 150 µA IQ IQ IQ IQ ± 450 µA ± 300 µA ± 150 µA ± 30 µA Output PDFM PD current A PD current B PD current C PD current D Output PDAM PD current A PD current B PD current C PD current D Semiconductor Group 8 VPD = 4 V 04.96 SDA 4331X 4.3 AC/DC Characteristics (cont’d) Parameter Symbol Limit Values min. typ. 7.5 7.7 Unit Test Condition V IQH = 2 mA VPD FM = VDD2 = 9 V VPD FM = VDD2 = 9 V VPD FM = GND VQ = 4 V max. Output PDFMA H-output voltage VQH H-output current IQH IQL L-output current 2 5 mA µA 10 Output PDAMA H-output voltage L-output current IQH IQL 1 2.5 0.1 mA mA VPD AM = 5 V VPD AM = GND VQ = 5 V Note: The listed characteristics are ensured over the operating range of the integrated circuit. Typical characteristics specify mean values expected over the production spread. If not otherwise specified, typical characteristics apply at TA = 25 °C and the given supply voltage. Table 1 Programming of Mode and Frequency Resolution AM/FM R1 R0 Mode Frequency Resolution [MHz] 0 0 1 FM 12.5 0 1 0 FM 25 0 1 1 FM 50 1 0 1 AM 1 1 1 0 AM 5 1 1 1 AM 10 Semiconductor Group 9 04.96 SDA 4331X Table 2 Programming R-prescaler RP1 RP0 Divide Ratio Quartz Frequency [MHz] 0 0 1:1 Test mode only 0 1 1:80 4 1 0 1:160 8 1 1 1:205 10.25 Table 3 Programming Phase Detector PD1 PD0 Current Level PPD Polarity 0 0 D 0 Normal 0 1 C 1 Invers 1 0 B 1 1 A Table 4 Programming Test Mode T1 T2 0 0 1 0 SA1 PD_MUX Semiconductor Group SA2 SA3 SA4 T3 Operation Controlled by I2C Bus 0 Normal Clk_50 kHz N_A_CLN 1 Test reset 10 04.96 SDA 4331X Diagram 1: I2C Protocol Slave-receive (Write) START 1 1 0 0 1 0 0/1 0 ACK MSB N14 N13 N12 N11 N10 N9 N8 ACK A/N-counter N7 N6 N5 N4 N3 N2 N1 LSB ACK [STOP or START]: [STOP or START] Optional STOP or START condition, after power ON AM/FM the complete sequence has to be programmed. PD1 PD0 IF SA4 SA3 SA2 SA1 ACK [STOP or START] G1 G0 F0 R1 R0 RP1 RP0 0 ACK [STOP or START] PPD T0 (= 0) T1 (= 0) T2 (= 0) T3 (= 0) X X X ACK STOP or START Semiconductor Group 11 04.96 SDA 4331X Figure 3 Application Circuit for AM and FM Charge Pump Output Semiconductor Group 12 04.96 SDA 4331X 5 Package Outlines GPS05144 P-DSO-24-1 (Plastic Dual Small Outline Package) Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book “Package Information”. SMD = Surface Mounted Device Semiconductor Group 13 Dimensions in mm 04.96