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參數資料
| 型號： | LA4587M |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.021 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封裝： | QIP-48 |
| 文件頁數： | 2/18頁 |
| 文件大小： | 407K |
| 代理商： | LA4587M |
Operation Descprition
.
Low boost system
.
Note on low boost
The signals that are applied to each power input are mixed and then passed through a two-stage LPF. Because the signal levels
are attenuated by the LPF, level compensation is accomplished by amplifying the signals through a low boost amplifier located
in between. The phase of signals that pass through the secondary LPF is inverted relative to the input signal; these signals are
then input to each power amplifier.
.
Note on channels 1 and 2
The positive phase signals that were input from the positive (‘‘+’’) input pins and the reverse phase signals that were input from
the negative (‘‘–’’) input pins and then were passed through the secondary LPF are all input, amplified, and then output.
.
Note on the common amplifier
The phase of the signals that passed through the secondary LPF is inverted by the inverting amplifier; the signals (with reversed
phases relative to channels 1 and 2) are then input to the negative (‘‘–’’) inputs. The positive (‘‘+’’) input signals are grounded
to VREF, amplified by the inverting amplifier and then output.
The phase of the channel 1 and 2 amplifier outputs and the common amplifier outputs are made to oscillate with inverted
phases, making it possible to obtain the dynamic range efficiently.
Low-frequency region amplification: 12 dB/oct, high-frequency region amplification: 6 dB/oct.
Phase 90 °
Phase 180 °
LA4587M
No.5204-10/18
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