LA4581MB Datasheet, PDF (4/8 Pages) Sanyo Semicon Device – Preamplifier Power Amplifier for 3V Headphone Stereos

LA4581MB
Continued from preceding page.
Pin No.
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pin Function
PRE MUTE
v
v
When V_CC is applied,
MUTE ON conditions:
PRE
V_8IN
MUTE ON.
^ V_CC – 0.2
V,
inflow
current
I₇
7
60
µA
(when
V_CC
=
3
V)
Ripple Filter REF 2.7 V(C₇ = 2.2 µF to 33 µF)
v Ripple Filter, V_ref reference
v
v
The V_ref ripple
R_r is 55 dB for
rejection ratio worsens when
22 µF; 35 dB for 2.2 µF.
C₇
is
made
smaller.
Ripple Filter OUT 2.7 V
v Ripple rejection ratio: R_r is 38 dB when C₇ = 22 µF; 30 dB when C₇ = 2.2 µF.
v Outflow current I₇ max = 1 mA
V_CC 3.0 V
POWER GND
COMMON 1.2 V
POWER OUT1 1.2 V
v CH1 output.
POWER OUT2 1.2 V
v CH2 output
POWER MUTE 0.7 V (C₁₀ = 1.0 µF to 4.7 µF)
v When connected to GND: POWER MUTE ON.
v MUTE ON conditions: V₁₆ % 0.3 V, outflow current I₁₆ 7 2.5 µA.
v C₁₀ can be used to control MUTE TIME.
v When C₁₀ = 2.2 µF, V_CC =3.0 V 0.7 sec.
FWD/REV SW (C11 % 0.47 µF)
v When connected to GND, PRE IN1R (pin 2) and IN2R (pin 23) turn on.
v When floating, PRE IN1F (pin 3) and IN2F (pin 22) turn on.
v C₁₁ and R₇ are intended for smoothing at the time of switching.
v REV condition: V₁₇ % 0.2 V.
POWER IN2 1.8 V
v Input resistance R_IN 7 30 kΩ
SW OUT2 1.8 V
v Provides PRE AMP2 when pin 8 is floating (PRE MUTE OFF) (equivalent to pin 20).
v Disconnects from PRE AMP2 and R_IN ^ 500 kΩ when pin 8 is V_CC (PRE MUTE ON).
PRE OUT2 1.8 V
v Like pin 19, 10 kΩ load drivable.
PRE NF2 1.8V
PRE IN2F 1.8 V
v Turns on when pin 17 is floating.
v A bias resistor (2.2 kΩ) must be connected between pin 22 and pin 24 (V_ref) when no head is in use.
PRE IN2R 1.8 V
v Turns on when pin 17 is connected to GND.
v A bias resistor (2.2 kΩ) must be connected between pin 23 and pin 24(V_ref) when no head is in use.
v^VTreh^fe1.r8efVerence voltage is set to 3/5 × V_CC. Because Vref AMP (r_O 7 10 Ω) is built in, C₁₇ can be made smaller (1 µF).
v Inflow/outflow current I₂₄ = ± 500 µA available.
Sample Application:
Radio set application.
As shown above, Radio on and
Pre Mute can be implemented with one-circuit
switch.
No.3535-4/8