Description

The SD4001 is CMOS LSI chips developed for world-wide FM / MW / LW tuning with PLL frequency

synthesizer system. The SD4001 can make a compact and high performance FM / MW / LW tuner

with clock function for high-end car stereo,   home stereo and so on because these CMOS LSIs are in

64-pin QFP package with built-in PLL frequency synthesizer, controller, 200 MHz prescaler, LCD

driver and IF counter.

Functions

Radio Functions

(1) Manual tuning 

    Manual tuning up/down ….. Stepped tuning an d rapid tuning.

(2) Auto tuning 

    Seek up/down ….. Retaining the frequency of a station received.

    Scan up/down ….. Receiving in intervals of 5 seconds.

(3) Preset memory scanning ….. Receiving the contents of preset memories on the FM, MW.

and LW bands for 5 seconds each.

(4) VF auto – tuning

    SK seek up/down …. Retaining the frequency of a SK signal received.

    SK scan up/down …. Receiving a station with SK signal in intervals of 5 seconds.

(5) Preset memories

    FM band …. FM 1:6 stations, RW 2:6 stations, FM 3:6 stations

    MW band … MW 1:6 stations, MW 2:6 stations

    LW band … 6 stations

    VF band …. 6 stations

    MW2 cannot be used while the LW band is used.

(6) Last-preset memories …… 1 station on the FM1, FM2, FM3, MW1, MW2, LW and VF

bands each.

(7) LOC (local) control signaloutputs and indications.

(8) FM MONO (monaural) control signal output and indication.(For VF bands, same as for FM)

(9) “ST” (stereo) indicator …… Enabled on the FM and VF bands.

(10) Auto-preset memories

(11) DK stand-by and SK alarm function



Tape Functions

(1)  Tape transport direction indictors ….. Can flash at 2 HZ during fast forward.

(2) AMS (auto music search) control signal output and indication.

(3) MTL (metal) control signal output and indication.

(4) NR1 (noise reduction) and NR2 control outputs and indications.



Functions (Continued)

CLOCK Functions

(1)  Selectable 12-hour(with AM and PM indicators) of 24-hour display.

(2)  Selectable flashing colon(;) (1Hz)

(3) Low-power (10µA) backup available in the NOCLK(no-clock)mode.



Others

(1)  LOUD (loudness) control signal output and indication ….. common to radio, tape and CD 

modes.

(2) Key acknowledge(beep) signal outputs (2.25 kHz, 40ms) ….. Enabled by valid 

momentary keys.

(3) Display selector and priority display function.

(4) ““ (complex disk) indicator.