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參數(shù)資料
| 型號： | LA4165M |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封裝： | 0.375 INCH, PLASTIC, MFP-24 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 1590K |
| 代理商： | LA4165M |
LA4165M
No. 2824-7/16
Functional Description
[Preamp]
The frequency response characteristic of the low noise preamplifier is selected by the record/playback select pin
CONT (pin 20). If CONT is taken to ground to select record mode, the frequency response is flat. If CONT is left open,
playback mode is selected and the preamp has the NAM response curve.
[Power Amp]
The power amplifier is suited to driving 4
speakers and earphones.
[ALC]
The ALC (Automatic Level Control) circuit is active in recording mode. It detects the power amp output level, and
controls the preamplifier input gain so that the power amp output level is constant.
[VOX CONT VOX]
This circuit monitors the power amp output level, and turns the motor drive on or off. When the VOX CONT circuit is
operating, the LED drive output on pin 16 is active. The LED is extinguished if the supply voltage drops to 1.8V.
[GVN]
Motor control circuit. The external constants are determined according to the motor characteristics to keep the motor
speed constant.
Circuit Components
The function of each component, together with recommended values in parentheses, are listed below.
C1 : (2200 to 4700pF)
Determines the frequency response of the signal voltage to the record/replay head during recording. Its value
should be selected according to the characteristics of the head.
C2 : (4700pF)
Determines the playback equalization frequency response.
C3 : (2200pF)
Suppresses high-frequency oscillation.
C4 : (2200 to 4700pF)
Controls high-frequency characteristics. C4 will interact with R3 to reduce the power amp input level if it is
too large.
C5 : (2200 to 4700pF)
Microphone input high-frequency filter. This should be selected according to the high-frequency cut-off and the
value of C21.
C6 : (470
F)
Couples the power amp output to the speaker or headphones. A value of 220
F is adequate when using an
8
speaker or headphones.
C7 : (1
F)
Suppresses oscillation. For low-temperature operation (down to - 10
°C), a 0.47F tantalum electrolytic
capacitor should be used.
C8 : (22
F)
ALC control smoothing filter. C8 should not be too large, since this will also increase attack time.
C9 : (0.1 to 2.2
F)
Voice sensor (VOX) control smoothing filter. C8 should not be too large, since this will also increase turn-on
delay (the time for the motor drive circuit to turn on after the microphone input voltage reaches the set level).
C10 : (10
F)
Voice sensor transient suppression. This prevents the motor drive from being turned on by large transient pulses.
C11 : (47
F)
Determines the time constant for motor drive hold after the voice sensor circuit turns off. The motor drive
remains on for approximately 4 to 5 seconds if the resistor in parallel with R5 is 300k
.
Continued on next page
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4166M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Recording and Playback System for Microcassette Players |
| LA4167M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1-Channel Record/Playback System for Microcassette and Cassette Recorders |
| LA4168 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Record/Playback System for Microcassette and Compact Cassette Recorders(148.50 k) |
| LA4168M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Record/Playback System for Microcassette and Compact Cassette Recorders |
| LA4170 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:SINGLE-CHIP AF AMPLIFIER |
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