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參數資料
| 型號： | LA4589W |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.021 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封裝： | SQFP-48 |
| 文件頁數： | 8/9頁 |
| 文件大小： | 170K |
| 代理商： | LA4589W |
LA4589W
No.3968–8/9
Continued from preceding page.
Note
Nominal voltages are measured when VCC=1.2V.
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Functional Description
Preamplifier
The preamplifier incorporates equalization networks for
normal- and metal-tape playback modes, and tape-
direction switches for an auto-reverse cassette mecha-
nism.
When METALSW is floating, metal-tape mode is
selected. METAL1 and METAL2 are grounded internally
through 3.9k
resistors, adjusting the negative feedback
network to provide metal-tape playback equalization.
When F/RSW is floating, forward playback mode is
selected, and PREFI1 and PREFI2 are connected to the
preamplifier imputs. When F/RSW is grounded, reverse
playback mode is selected, and PRERI1 and PRERI2 are
connected to the preamplifier inputs.
The automatic music search (AMS) circuit generates a
signal that controls the cassette mechanism fast-forward
and reverse functions in response to pauses between
music tracks. The signal on AMSOUT is a pulse wave
whose amplitude varies with the input signal levels on
AMSIN1 and AMSIN2.
Power Amplifier
The power amplifier incorporates an additional amplifier
to provide bass boost and mute functions.
When LBSW is floating, the bass boost function is
selected. PHP1 and PHP2 are connected to VREF
through 1k
internal resistors, adjusting the negative
feedback network to provide highpass filtering.
When PMUTESW is grounded, the power amplifier
mute function is selected.
Ripple Filter
The ripple filters can be configured for either single or
dual-filter operation. When RF1SW is grounded, the
ripple filters are configured for dual-filter operation and
RFOUT1 is active.
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