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參數(shù)資料
| 型號： | LA4809M |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.16 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO12 |
| 封裝： | 0.225 INCH, MFP-12 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 252K |
| 代理商： | LA4809M |
LA4809M
Cautions for use
1. Input coupling capacitors (Cin1, Cin2)
Cin1 (Cin2) is an input coupling capacitor, which is intended for DC cut. This capacitor forms a high pass filter
together with the internal resistance of 45k
Ω attenuating the bass frequency signal. Set the capacitance value with due
consideration of the cut-off frequency.
Note that the cut-off frequency is expressed as follows :
1ch
fc1 = 1/ (2π × Cin1 × 45000)
2ch
fc2 = 1/ (2π × Cin2 × 45000)
This capacitor also affects the pop noise at a time of falling. Note that setting the higher capacitance value causes delay
of the capacitor discharge rate, causing louder pop noise.
2. Output coupling capacitors (Cout1, Cout2)
Cout1 (Cout2) is an output coupling capacitor, which is intended for DC cut. This capacitor forms a high pass filter
together with the load impedance of RL, attenuating the bass frequency signal. Set the capacitance value with due
consideration of the cut-off frequency. Normally, the chemical capacitor is used. When setting the capacitance value,
take into account the characteristics of the chemical capacitor, namely, the capacitance value of chemical capacitor
tends to decrease at low temperature.
Note that the cut-off frequency is expressed as follows :
1ch
fc3 = 1/ (2π × Cout1 × RL)
2ch
fc4 = 1/ (2π × Cout2 × RL)
This capacitor also affects the pop noise at a time of rising. Note that setting the higher capacitance value causes louder
pop noise.
3. Power supply line capacitor (CVCC)
CVCC is intended to stabilize the power supply line. Arrange this capacitor as near to IC as possible and always use the
ceramic capacitor with superior high frequency characteristics.
Increase the capacitance value when the power supply line is relatively unstable.
4. Pin 2 capacitor (Crf)
Crf is a capacitor to determine the transient response characteristics of the Pin 2 voltage (reference voltage) : Vrf. At a
time of rising, this is charged by the internal constant-current source (about 39
μA). At a time of falling, this is
discharged by the internal resistance (about 157k
Ω). Due attention must be paid because pop noise and the amplifier
rise / fall time change depending on the transient response characteristics of Pin 2 voltage. Decreasing the capacitance
value to shorten the response time, pop noise becomes louder. Therefore, the use of the value shown below as the
capacitance value is recommended. As this capacitor reduces the power supply ripple component, decrease in the
capacitance value results in lowering of the ripple removal ratio.
Crf recommended values : 1
μF to 3.3μF
5. Voltage gain
The voltage gain of amplifier is determined by the internal resistance and is fixed at about 11.7dB. When the output
level is to be changed, attempt attenuation with the resistor in the forward stage of input as shown in Fig.1. To enhance
the degree of attenuation, use two resistors as shown in Fig.2 so as to reduce internal-resistor variation factors.
Though attenuation in the backward stage of output as shown in Fig.3 is possible, this may cause decrease in the
maximum output power.
No.A1569-6/15
(Low attenuation degree)
(High attenuation degree)
IN
OUT
other IC
LA4809M
IN
OUT
other IC
LA4809M
OUT
LA4809M
+
Fig.1
Fig.2
Fig.3
6. Load capacitance
When connecting a capacitor between the output pin and GND for an anti-electric wave radiation measure, this
capacitor may cause decrease in the phase margin of power amplifier, resulting in the oscillation phenomenon. When
connecting this capacitor, pay attention to its capacitance value.
Recommended capacitance value : 560pF or less, or 0.01
μF to 0.1μF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4809M-TLM-E | 功能描述:音頻放大器 STEREO HP AMPLIFIER RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LA4810M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC Stereo/Monaural BTL Power |
| LA4814JA | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC 2-Channel Power Amplifier |
| LA4814JA-AE | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LA4814JA-ZE | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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