參數(shù)資料
型號(hào)： UPC2533GS-01
廠商： NEC Corp.
英文描述： AM TUNER FOR ELECTRONIC TUNING CAR RADIOS
中文描述： 上午調(diào)諧器電子調(diào)諧汽車收音機(jī)
文件頁(yè)數(shù)： 17/36頁(yè)
文件大?。?/td> 212K
代理商： UPC2533GS-01
17
μ
PC2533
2.7 Station Detector Circuit Block
Fig. 2-7 Station Detector Circuit Block
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
μ
PC2533 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
μ
PC2533GS-01 and
μ
PC2533GS-02 differ.
With the
μ
PC2533GS-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
μ
PC2533GS-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
SD Sensitivity (AC, DC)
51 k
27 dB
μ
V
24 k
29 dB
μ
V
10 k
33 dB
μ
V
B
B
+
–
–
+
–
+
10
5
6
8
1.0 V
ON/OFF
1.0 V
Detection comparator 1
Detection comparator 2
From signal meter
circuit (Fig. 2-6)
To time constant
switchover circuit
(Fig. 2-6)
From DTS (request)
SD output
(Active high)
SD AC output
450kHz IF input
(from T3)
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