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參數(shù)資料
| 型號(hào)： | CXA1538M |
| 廠商： | Sony Corporation |
| 英文描述： | FM Stereo/AM Radio IC(FM調(diào)頻立體聲/AM收音芯片) |
| 中文描述： | FM立體聲/ AM收音機(jī)集成電路（調(diào)頻立體聲調(diào)頻/調(diào)幅收音芯片） |
| 文件頁(yè)數(shù)： | 10/15頁(yè) |
| 文件大小： | 285K |
| 代理商： | CXA1538M |
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CXA1538M/N/S
Notes on Usage
1. VCO free run frequency adjustment method
As this IC has built-in oscillation capacitance, the oscillation frequency can be controlled with an external
resistor.
1) VCO Adjustment Method
Pin 4 is the stereo indicator and VCO check pin. Therefore, in stereo mode (when stereo indicator drive
Tr Q2 is switched on), pin 4 voltage lowers down, Q1 is cut off and VCO oscillation waveform can not be
seen. In AM mode as well, the oscillation waveform can not be seen as VCO turns off.
Adjust the free run frequency at 76 kHz ±50 Hz.
In this IC, tuner and MPX sections are directly connected. Therefore, free run frequency is not stable, being
affected by noise except in reception mode. For free run adjustment, input signals from either RF or IF.
(Input signal should be RF [Tuning frequency] or fo of the discriminator using IF (10.7 MHz) and input
more than 60 dBμ.)
2) How to Deal with pin 4 After Adjustment.
With the use of a stereo indicator.
When V
CC
is 3 V or more, insert a bypass resistance
R to prevent LED malfunction.
Without the use of a stereo indicator.
Turn pin 4 to open or connect to GND.
3) Control Resistor of VCO Oscillation Frequency
For the VCO control resistor of this iC, a carbon film resistor suffices.
For easier adjustment of temperature characteristics and VCO free run frequency, the following
combination is recommended.
27
28
10k
22k
Capacitor for decoupling
Q1
Q2
33k
V
CC
about 180mVp-p
4
2.2k
V
CC
=3V
4
OPEN
4
4
27
28
10k
22k
2.2k
R
V
CC
>
3V
4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CXA1538N | FM Stereo/AM Radio IC(FM調(diào)頻立體聲/AM收音芯片) |
| CXA1538S | FM Stereo/AM Radio IC(FM調(diào)頻立體聲/AM收音芯片) |
| CXA1538 | Quad Precision Operational Amplifier 14-CDIP -55 to 125 |
| CXA1550P | Dolby B Type Noise Reduction System(杜比B型降噪系統(tǒng)) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CXA1538M/N/S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FM Stereo/AM Radio |
| CXA1538N | 制造商:SONY 制造商全稱:Sony Corporation 功能描述:FM STEREO/AM RADIO |
| CXA1538S | 制造商:SONY 制造商全稱:Sony Corporation 功能描述:FM STEREO/AM RADIO |
| CXA1541M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Prescaler/Frequency Divider |
| CXA1547Q | 制造商:SONY 制造商全稱:Sony Corporation 功能描述:High-Speed Transimpedance Amplifier |
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