Kenwood TS-950S Service Manual

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TS-9505/SD94SEMICONDUCTOR DATAA/D converter : PCM78AP (DSP unit IC12)Block diagram[55] FILTERANALOG GNDFILTERZVv POT+VecDIGITAL GNDEXT CLOCK2WORD CLOCKCONV CMD.SHORT CYCLEINT/EXT SELECTEXT CLOCK1SERIAL OUT¢ Terminal functionPin No. | Pin name VO Function1 ANALOG INPUT | | AVD converter analog input. Input impedance 1.5kQ (TYP)2 -Vec ~ | Analog -Vcc.3 MSB ADJ | | MSB adjustment (MSB DLE compensation) input terminal.4 +Vbo0 - | Comparator +VoD.5 NC -6 COMP GND - | Comparator ground. Usually connected to digital common.7 MSB O | MSB output terminal.8 BOB/BTC SELECT | | | Output digital code selection terminal, “L' : BOB, ''H" ; BTCi] STATUS O | Status signa! output terminal.10 CLOCK OUT O | Main clock output terminal for SAR operation.an RC1 — | Internal clock oscillation frequency setting terminal.Pulled up to +Voo by 10kQ when an external clock is used.12 RC2 - | Internal clock oscillation frequency setting terminal.| Pulled up to +Vop by 10kQ when an external clock is used.13 SERIAL OUT2 © | Serial data output synchronized with EXT CLOCK2 signal.14 +VbD - | Digital +Voo.15 SERIAL OUT1 © } Serial data output synchronized with internal clock or EXT CLOCK1.16 EXT CLOCK1 ( External clock (EXT CLOCK1} input. Opened or pulled up when not used.17 INT/EXT SELECT |} Internal/external clock selection terminal. "L's INT, “H"' ; EXT18 SHORT CYCLE | | Short cycle timing input terminal.19 CONV CMD |} Conversion command signal input terminal. Set low when not used.20 WORD CLOCK | | WORD CLOCK input terminal. Opened or pulled up when nor used.21 EXT CLOCK2 | | External clock (EXT CLOCK2) input terminal. Opened or pulled up when not used.22 OIGITAL GND - | Digital ground.23 +Vec - | Analog +Vec.24 V POT O | MSB adjustment reference voltage output terminal.25 FILTER2 — | Internal reference filter. A 3.3uF capacitor is connected to ~Vcc.26 ANALOG GND - | Analog ground. A 2.2uF capacitor is connected to ANA GND.27 TP ~ | Test point for operation check.28 FILTER1 —_ | Internal reference filter. A 3.3uF capacitor is connected to ANA GND.