Kenwood FM Transceiver TK-481 Service Manual

Also see for FM Transceiver TK-481: User manual Instruction manual Specifications Instruction manual Service manual

22TK-480/481 SEMICONDUCTOR DATAPLL System : SA7025DK (TX-RX Unit IC11) Block diagram Pin descriptionPin No. Symbol Description1 CLOCK Serial clock input.2 DATA Serial data input.3 STROBE Serial strobe input.4 V SS Digital ground.5 RF IN Prescaler positive input.6 RF IN Prescaler negative input.7 V CCP Prescaler positive supply voltage. This pin supplies power to the prescaler and RF input buffer.8 REF IN Reference divider input.9 RA Auxiliary current setting; resistor to V SSA.10 AUX IN Auxiliary divider input.11 PHA Auxiliary phase detector output.12 V SSA analog ground.13 PHI Integral phase detector output.14 PHP Proportional phase detector output.15 V DDA Analog supply voltage. This pin supplies power to the charge pumps, Auxiliary prescaler, Auxiliary and Reference buffers.16 RN Main current setting; resistor to V SSA.17 RF Fractional compensation current setting; resistor to V SSA.18 LOCK Lock detector output.19 TEST Test pin; connect to VDD .20 V DD Digital supply voltage. This pin supplies power to the CMOS digital part of the device.CLOCKDATASTROBE64/65/72Prescaler Main dividersPR NM1NM2NM312 822FBEMFractionalaccumulatorFMOD NF3Prescalermodulus controlFBMain phasedetectorNormal outputcharge pumpReference divider ÷2 ÷2 ÷2MainreferenceselectEMEM÷EA NR12SM2AuxiliaryreferenceselectSA2AuxiliaryphasedetectorEAEA1/4Prescaler Auxiliary dividerPA NA12Auxiliary outputcharge pumpIntegral outputcharge pumpSpeed-upoutputcharge pump2FRDCN8CL2CK4Serial input + Program latchesRF INRF INTESTVssREF INV CCPAUX INV DDA V SSAV DDRFRNPHPPHIRAPHALOCK