LA4589W データシートの表示（PDF） - SANYO -> Panasonic
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LA4589W Datasheet PDF : 9 Pages
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Continued from preceding page.
Number
Name
39
F/RSW
40
METALSW
43
RF1SW
42
NC
LA4589W
Equivalent circuit
Description
Forward/reverse playback control input.
Metal-tape mode control input.
Ripple filter output 1 control input.
No connection.
44
RFREF
Ripple filter capacitor connection. Nominal voltage is 1.13V.
46
RFBASE2
Ripple filter external pnp-transistor 2 base connection.
Nominal voltage is 0.5V.
48
RFBASE1
47
VCC
Note
Nominal voltages are measured when VCC=1.2V.
Ripple filter external pnp-transistor 1 base connection.
Nominal voltage is 0.5V.
Supply voltage.
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 3.9kΩ 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 1kΩ 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.
No.3968–8/9
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