SC72131 PLL FOR DIGITAL TUNING SYSTEM(DTS) DESCRIPTION The SC72131 is phase-locked loop (PLL) LSI for digital turning systems (DTS). The LSI is use to configure high-performance digital tuning systems,such as radio/cassette players. They allow high-performance SDIP-22-300-1.778 AM/FM tuners to be implemented easily. FEATURES * Built-in prescalers. Operate at input frequency ranging from SOP-20-300-1.27 10~160MHz during FMIN input and at 0.5~40MHz during AMIN input. * 12 possible reference frequencies (with 4.5 or 7.2 MHz crystal) 1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 15, 25, 50 and 100 kHz * Built-in 20bit general-purpose counter for such as measuring intermediate frequency (IF), IF input frequency ranging from 0.4M~12MHz. * Has an unlock detector circuit an dead zone control circuit and an ORDERING INFORMATION Part No. Package SC72131 SDIP-22-300-1.778 SC72131S SOP-20-300-1.27 deadlock clear circuit * Built-in MOS transistor for forming an active low-pass filter APPLICATIONS * 4 N-channel open-drain output ports (OFF withstanding Voltage: 13V) and 2 input or output ports. * Digital Tuning Systems * Serial data I/O — All functions controlled through 4 serial bus lines * Operating ranges — Supply voltage.....................… 5.0±0.5 V — Operating temperature........–40 to +85° C * Packages — SDIP-22-300-1.78 — SOP-20-300-1.27 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.0 2004.08.03 Page 1 of 11 SC72131 BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS (Tamb=25°C, VSS=0V) Characteristics Symbol Ratings Unit VDDmax -0.3 to 7.0 V Allowable Power Dissipation Pdmax 350 mW N-ch Open-Drain OFF Withstanding Voltage VOFF 13 V Operating Temperature Topr -40 to +85 °C Supply Voltage ELECTRICAL CHARACTERISTICS (Tamb=-40 to 85°C, VSS=0V) Characteristics Built-in Feedback Resistance Symbol Test Condition Min. Typ. Max. Unit Rf1 1.0 MΩ Rf2 500 kΩ Rf3 500 kΩ Rf4 250 kΩ Rpd1 200 kΩ Rpd2 200 kΩ Hysteresis VHIS 0.1VDD V Output High Level Voltage VOH1 Built-in Pull-down Resistor IO=-1mA VDD-1.0 V (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.0 2004.08.03 Page 2 of 11 SC72131 (Continued) Characteristics Symbol VOL1 Input Low Level Current Output Off Leakage Current High Level Three-state Off Leakage Current Low Level Three-state Off Leakage Current Input Capacitance Max. Unit 1.0 V IO=1mA 0.5 V 1.0 V IO=1mA 0.2 V IO=5mA 1.0 V IO=1mA 0.2 V IO=5mA 1.0 V IO=8mA 1.6 V IO=1mA, AIN=1.3V 0.5 V IIH1 VI=6.5V 5.0 µA IIH2 VI=13V 5.0 µA IIH3 VI=VDD 2.0 11 µA IIH4 VI=VDD 4.0 22 µA IIH5 VI=VDD 8.0 44 µA IIH6 VI=6.5V 200 nA IIL1 VI=0 5.0 µA IIL2 VI=0 5.0 µA IIL3 VI=0 2.0 11 µA IIL4 VI=0 4.0 22 µA IIL5 VI=0 8.0 44 µA IIL6 VI=0 200 µA IOFF1 VO=13 5.0 µA IOFF2 VO=6.5V 5.0 µA IOFFH VO=VDD 0.01 200 nA IOFFL VO=0V 0.01 200 nA VOL3 VOL5 Input Low Level Current Typ. IO=0.5mA VOL4 Input High Level Current Min. IO=1mA VOL2 Output Low Level Voltage Test Condition CIN 6 pF Xtal=7.2MHz, IDD1 fIN2=130MHz, 5 10 mA VIN2=40mVrms Current Drain PLL block stopped (PLL IDD2 INHIBIT), Xtal oscillator 0.5 mA operating (Xtal=7.2MHz) IDD3 PLL block stopped, Xtal HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn 10 oscillator stopped REV:2.0 µA 2004.08.03 Page 3 of 11 SC72131 PIN CONFIGURATION (SDIP22, SOP20) PIN DESCRIPTION Pin NO. Pin Name Description 1 OSCIN Connects 4.5M or 7.2M crystal oscillator to supply reference 20 OSCOUT SDIP-22 SOP-20 1 22 2 NC frequency and internal clock. -- 3 2 PERIOD Serial I/O ports, These pins transfer data to and from the controller 4 3 DIN 5 4 CLOCK 6 5 DOUT 7 6 OT1 •N channel open drain port pins. 8 7 OT2 •The output states are determined by OT1 to OT4 bits in the serial 9 8 OT3 to set divisors and dividing modes, and to control the generalpurpose counter and general-purpose I/O ports. data. •If the serial data TBC bit is set to 1, a time base signal (8Hz) can be output from the OT1 pin. 10 9 OT4 11 10 IO1 •CMOS structure allows free use of these ports for input or output. 13 12 IO2 •Ports are set for input when the power is turned on. •These pins are set to the OFF state when power is turn on. •Input pin for measure general-purpose counter frequencies. The frequency measurement function has such uses as measuring 12 11 IFIN intermediate frequencies (IF) •These pin feature built-in amps, Data are input by capacitor coupling. (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.0 2004.08.03 Page 4 of 11 SC72131 (Continued) Pin NO. SDIP-22 Pin Name SOP-20 14 NC Description -- 15 13 AMIN • These pins input AM and FM band local oscillator signals by 16 14 FMIN 17 15 VDD •power supply pin (Applies 5.0V±10%) 18 16 DO •This pin is for phase comparator tristate output. 19 17 LFIN 20 18 LFOUT 21 19 GND capacitor coupling. •These pins feature built-in amps. •These pins for low-pass filter input pin and output pin. •The SC72131 ground. FUNCTION DESCRIPTION Serial Data I/O Methods The SC72131 inputs and outputs data using the 4 serial bus lines, the serial data I/O methods are selected by an 8bit address Register assignments R3 R2 R1 R0 OSC CTE FM MODE P15 P14 P13 P12 P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 P0 Address = 82H(IN) Address = 92H(IN) IO IO C1 C2 OT3 IO1 IO 2 OT1 OT2 OT4 * DO DO DO UL UL DZ DZ C0 C1 C2 0 1 0 1 D G0 G1 TO O C IF S T0 T1 T2 Address = A2H (OUT) I1 I2 * UL IF1 IF1 IF1 IF1 IF1 IF1 IF1 IF1 IF1 IF1 9 8 7 6 5 4 3 2 1 0 IF9 IF8 IF7 IF6 IF5 IF4 IF3 IF2 IF1 IF0 Programmable divider structure Swallow counter and programmable counter circuit configuration HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.0 2004.08.03 Page 5 of 11 SC72131 FM MODE Input pin Set divisor Actual divisor: N Input frequency range (MHz) 1 * FMIN 272 to 65535 Twice the set value 10 to 160 0 1 AMIN 272 to 65535 The set value 2 to 40 0 0 AMIN 4 to 4095 The set value 0.5 to 10 Note: * Don’ t care. 1.IF Counter Structure The SC72131 IF counter section consists of input amp, a gate time control circuit and a 20bit binary counter. The result, i.e., the counter’ s msb, can be read serially from the Dout pin. G1 G0 Gate time (GT) (ms) Wait time (ms) 0 0 4 3~4 0 1 8 3~4 1 0 32 7~8 1 1 64 7~8 2. IF Counter Operation Note: 1. IFIN input have built-in amp. Data are input by capacitor coupling. 2. Before starting the IF count, the IF counter must be reset in advance by setting CTE in the serial data to 0. 3. The IF count is started by changing the CTE bit in the serial data from 0 to 1. The serial data is latched by the SC72131 when the CE pin is dropped from high to low. 4.The IF signal must be supplied to the IFIN pin in the period between the point the CE pin goes low and the end of the wait time at the latest. 5. The value of the IF counter at the end of the Gate-Time must be read out during the period that CTE is 1. This is because the IF counter is reset when CTE is set to 0. 6. When operating the IF counter, the control microprocessor must first check the state of the IF-IC SD (station detect) signal and only after determining that the SD signal is present turn on IF buffer output HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.0 2004.08.03 Page 6 of 11 SC72131 and execute an IF count operation. Auto search techniques that use only the IF counter are not recommended, since it is possible for IF buffer leakage output to cause incorrect stops at points where there is no station. 3. Power Supply Pins A capacitor of at least 2000 pF must be inserted between the power supply VDD and GND pins for noise exclusion. This capacitor must be placed as close as possible to the VDD and GND pins. PIN STATES AFTER THE POWER ON RESET After power-on reset, the pins (DOUT OT1 OT2 OT3 OT4 ) are set to OPEN state and the pins ( IO1 , IO2 ) set to INPUT state. Note: this circuit according to SDIP-22 package, and the circuit of SOP-20 removed two NC pins, and others are the same as the above circuit. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.0 2004.08.03 Page 7 of 11 SC72131 TYPICAL APPLICATION CIRCUIT This section is susceptible to noise due to its high impedance. Therefore, the pattern lines should be kept as short as possible and this area should be covered with a ground pattern. 1 OSCIN 2 NC OSCOUT 22 GND 21 VCC µ -com CE 3 PERIOD LFOUT 20 DI 4 DIN CL 5 CLOCK DO 18 DO 6 DOUT VDD 17 LFIN 19 7 OT1 FMIN 16 8 OT2 AMIN 15 9 OT3 NC 14 10 OT4 IO2 1 11 IO1 IFIN 12 FMVCO AMVCO TUNERSystem tune FM/AM-IF IF-Request FM/AM MONO/BT ST-Indicate Note: this circuit according to SDIP-22 package, and the circuit of SOP-20 removed two NC pins, and others are the same as the above circuit. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.0 2004.08.03 Page 8 of 11 SC72131 PACKAGE OUTLINE SDIP-22-300-1.778 UNIT: mm SOP-20-300-1.27 UNIT: mm 0.15±0.05 1.27 0.45 2.25MAX 12.70±0.25 11.43 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.0 2004.08.03 Page 9 of 11 SC72131 HANDLING MOS DEVICES: Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: • Persons at a work bench should be earthed via a wrist strap. • Equipment cases should be earthed. • All tools used during assembly, including soldering tools and solder baths, must be earthed. • MOS devices should be packed for dispatch in antistatic/conductive containers. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.0 2004.08.03 Page 10 of 11