UPC2533GS Ver la hoja de datos (PDF) - NEC => Renesas Technology

Número de pieza

componentes Descripción

Fabricante

UPC2533GS

AM TUNER FOR ELECTRONIC TUNING CAR RADIOS

NEC => Renesas Technology 

2.7 Station Detector Circuit Block

Fig. 2-7 Station Detector Circuit Block

µPC2533

+ Detection comparator 1

–

1.0 V

+ Detection comparator 2

–

From signal meter

circuit (Fig. 2-6)

1.0 V

–

+

To time constant

switchover circuit

(Fig. 2-6)

ON/OFF

10 5

SD output

(Active high)

From DTS (request)

6

8

SD AC output

450kHz IF input

(from T3)

The configration station detector (SD) circuit block is shown in Fig. 2-7.

The SD circuit stops scanning or seeking when a broadcast wave is received when auto scanning or seek tuning.

Since the µPC2533 has two outputs (DC high/low signal (open collector) and AC IF signal (f = 450 kHz)), it can be

used according to DTS (digital tuning system) type. Input the SD request signal from DTS to pin 5.

The SD sensitivity setting methods of the µPC2533GS-01 and µPC2533GS-02 differ.

With the µPC2533GS-01, SD sensitivities in the IF counter output system and in the high/low output system are

set by external resistor between pin 7 and GND and by external resistor between pin 9 and GND.

With the µPC2533GS-02, SD sensitivities in both the IF counter output system and high/low output system are set

by external resistor between pin 7 and GND (refer to Fig. 2-6).

Table 2-1 SD Sensitivity Setting Examples

Value of Resistor between Pin 9 or Pin 7 and GND

51 kΩ

24 kΩ

10 kΩ

SD Sensitivity (AC, DC)

27 dBµV

29 dBµV

33 dBµV

17

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