SC72131 SILAN | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 10
Technical content
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 1 of 11 PLL FOR DIGITAL TUNING SYSTEM(DTS) SDIP223001.778 SOP203001.27
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 highperformance AM/FM tuners to be implemented easily.
FEATURES
- Built in prescalers. Operate at input frequency ranging from 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 * Builtin 20bit general purpose counter for such as measuring interm ediate frequency (IF), IF input frequency ranging from 0.4M~12MHz. * Has an unlock detector circuitˈan dead zone control circuit and an deadlock clear circuit * Builtin MOS transistor for forming an active lowpass filter * 4 Nchannel opendrain output ports (OFF withstandingVoltage: 13V) and 2 input or output ports. * Serial data I/O — All functions controlled through 4 serial bus lines * Operating ranges * Packages — SDIP223001.78 — SOP203001.27
ORDERING INFORMATION
Part No. Package SC72131 SDIP223001.778 SC72131S SOP203001.27
APPLICATIONS
- Digital Tuning Syste ms
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 2 of 11 BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS (Tamb=25°C, VSS=0V) Characteristics Symbol Ratings Unit Supply Voltage VDDm ax 0.3 to 7.0 V Allowable Power Dissipation Pdmax 350 mW Nch OpenDrain OFF Withstanding Voltage VOFF 13 V Operating Temperature Topr 40 to +85 °C ELECTRICAL CHARACTERISTICS (Tamb=40 to 85°C, VSS=0V) (To be continued) Characteristics Symbol Test Condition Min. Typ. Max. Unit Rf1 1.0 MΩ Rf2 500 kΩ Rf3 500 kΩ Builtin Feedback Resistance Rf4 250 kΩ Rpd1 200 kΩ Builtin Pulldown Resistor Rpd2 200 kΩ Hysteresis VHIS 0.1VDD V Output High Level Voltage VOH1 I O=1mA VDD1.0 V
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 3 of 11 (Continued) Characteristics Symbol Test Condition Min. Typ. Max. Unit VOL1 I O=1mA 1.0 V IO=0.5mA 0.5 V VOL2 IO=1mA 1.0 V IO=1mA 0.2 V VOL3 IO=5mA 1.0 V IO=1mA 0.2 V IO=5mA 1.0 VVOL4 IO=8mA 1.6 V Output Low Level Voltage VOL5 I O=1mA, AIN=1.3V 0.5 V IIH1 V I=6.5V 5.0 µ A IIH2 V I=13V 5.0 µ A IIH3 V I=VDD 2.0 11 µ A IIH4 V I=VDD 4.0 22 µ A IIH5 V I=VDD 8.0 44 µ A Input High Level Current IIH6 V I=6.5V 200 nA IIL1 V I=0 5.0 µ A Input Low Level Current IIL2 V I=0 5.0 µ A IIL3 V I=0 2.0 11 µ A IIL4 V I=0 4.0 22 µ A IIL5 V I=0 8.0 44 µ A Input Low Level Current IIL6 V I=0 200 µ A IOFF1 V O=13 5.0 µ A Output Off Leakage Current IOFF2 V O=6.5V 5.0 µ A High Level Threestate Off Leakage Current IOFFH V O=VDD 0.01 200 nA Low Level Threestate Off Leakage Current IOFFL V O=0V 0.01 200 nA Input Capacitance CIN 6 pF IDD1 Xtal=7.2MHz, fIN2=130MHz, VIN2=40mVrms 5 10 mA IDD2 PLL block stopped (PLL INHIBIT), Xtal oscillator operating (Xtal=7.2MHz) 0.5 mA Current Drain IDD3 PLL block stopped, Xtal oscillator stopped 10 µ A
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 4 of 11 PIN CONFIGURATION (SDIP22, SOP20) PIN DESCRIPTION Pin NO. SDIP22 SOP20 Pin Name Description 1 1 OSCIN 22 20 OSCOUT Connects 4.5M or 7.2M crystal oscillator to supply reference frequency and internal clock.
2 NC
Serial I/O ports, These pins transfer data to and from the controller to set divisors and dividing modes, and to control the general purpose counter and generalpurpose I/O ports. 7 6 OT1 8 7 OT2 9 8 OT3 10 9 OT4 N channel open drain port pins. The output states are determined byOT1 to OT4 bits in the serial data. If the serial data TBC bit is set to 1, a time base signal (8Hz) can be output from the OT1 pin. These pins are set to the OFF state when power is turn on. 11 10 1IO 13 12 2IO CMOS structure allows free use of these ports for input or output. Ports are set for input when the power is turned on. 12 11 IFIN Input pin for measure generalpurpose counter frequencies. The frequency measurement function has such uses as measuring interm ediate frequencies (IF) These pin feature builtin amps, Data are input by capacitor coupling. (To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 5 of 11 (Continued) Pin NO. SDIP22 SOP20 Pin Name Description
14 NC
These pins input AM and FM band local oscillator signals by capacitor coupling. These pins feature builtin amps. 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 These pins for lowpass filter input pin and output pin. 21 19 GND The SC72131 ground. FUNCTION DESCRIPTION Serial Dat a 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 Address = 82H(IN) P10 P11 P12 P13 P14 P15 MODE FM CTE OSC Address = 92H(IN) IO IO 1IO 2IO OT1 OT2 OT3 OT4 * DO DO DO UL UL DZ DZ G0 G1 TO D O C IF S T0 T1 T2 Address = A2H (OUT) I1 I2 * UL IF1 IF1 IF1 IF1 IF1 IF1 IF1 IF1 IF1 IF1 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 REV:2.0 2004.08.03 Http: www.silan.com.cn Page 6 of 11 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 builtin 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 GateTime 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 IFIC SD (station detect) signal and only after determining that the SD signal is present turn on IF buffer output
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 7 of 11 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 poweron reset, the pins (DOUT OT1 OT2 OT3 OT4 ) are set to OPEN state and the pins ( 1IO , 2IO ) set to INPUT state. Note: this circuit according to SDIP22 package, and the circuit of SOP20 re moved two NC pins, and others are the same as the above circuit.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 8 of 11 TYPICAL APPLICATION CIRCUIT OSCIN CLOCK OT1 OT3 OT2 DOUT IO1 OT4 PERIOD DIN OSCOUT GND LFOUT LFIN DO VDD FMIN AMIN IO2 IFIN µ com CE DI CL DO FMVCO AMVCO VCC tune FM/AMIF IFRequest FM/AM MONO/BT STIndicate TUNER System 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. NC NC Note: this circuit according to SDIP22 package, and the circuit of SOP20 re moved two NC pins, and others are the same as the above circuit.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 9 of 11 PACKAGE OUTLINE SDIP223001.778 UNIT: mm SOP203001.27 UNIT: mm 12.70±0.25 11.43 1.27 0.45 2.25MAX 0.15±0.05
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 10 of 11 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.